Hide dropdown box while entering value in the textarea

Hide dropdown box while entering value in the textarea - javascript

I am trying to hide a Dropdown Box with JavaScript once someone is entering text inside a textarea.
This is what I did so far:
HTML
<table>
NOTES OF A POST MORTEM EXAMINATION ON THE BODY OF A<br>
<select name="select86" id="travel_arriveVia" onchange='CheckColors86(this.value);'>
<option>Select</option>
<option value="Cattle">Cattle</option>
<option value="Buffalo">Buffalo</option>
<option value="Horse">Horse</option>
<option value="Camel">Camel</option>
<option value="Dog">Dog</option>
<option value="Sheep">Sheep</option>
<option value="Pig">Pig</option>
<option value="Goat">Goat</option>
<option value="Deer">Deer</option>
<option value="Others">Others</option>
</select>
<tr>
<td></td>
<td></td>
<td></td>
<td>
<textarea rows="3" cols="25" name="div86" id="color86" style='display:none'></textarea>
</td>
</tr>
</table>
JavaScript
function CheckColors86(val)
{
var element=document.getElementById('color86');
if(val=='Others')
element.style.display='block';
else
element.style.display='none';
}

function CheckColors86(val)
{
var element=document.getElementById('color86');
if(val=='Others')
element.style.display='block';
else
element.style.display='none';
}
function hideDropDown(){
var element=document.getElementById('travel_arriveVia');
element.style.display='none';
}
function showDropDown(){
var element=document.getElementById('travel_arriveVia');
element.style.display='block';
}
<table>
NOTES OF A POST MORTEM EXAMINATION ON THE BODY OF A<br>
<select name="select86" id="travel_arriveVia" onchange='CheckColors86(this.value);'>
<option>Select</option>
<option value="Cattle">Cattle</option>
<option value="Buffalo">Buffalo</option>
<option value="Horse">Horse</option>
<option value="Camel">Camel</option>
<option value="Dog">Dog</option>
<option value="Sheep">Sheep</option>
<option value="Pig">Pig</option>
<option value="Goat">Goat</option>
<option value="Deer">Deer</option>
<option value="Others">Others</option>
</select>
<tr>
<td></td><td></td><td></td>
<td>
<textarea rows="3" cols="25" name="div86" id="color86" onfocus='hideDropDown()'></textarea>
</td>
</table>
Hope this helps you out.

If you can use jQuery you can do it like that:
$('#color86').keyup(function() {
$('#travel_arriveVia').css('display', 'none');
});
Here the jsfiddle:
https://jsfiddle.net/ezd5ajmf/
Or as Snippet:
$('#color86').keyup(function() {
$('#travel_arriveVia').css('display', 'none');
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<table>
NOTES OF A POST MORTEM EXAMINATION ON THE BODY OF A<br>
<select name="select86" id="travel_arriveVia">
<option>Select</option>
<option value="Cattle">Cattle</option>
<option value="Buffalo">Buffalo</option>
<option value="Horse">Horse</option>
<option value="Camel">Camel</option>
<option value="Dog">Dog</option>
<option value="Sheep">Sheep</option>
<option value="Pig">Pig</option>
<option value="Goat">Goat</option>
<option value="Deer">Deer</option>
<option value="Others">Others</option>
</select>
<tr>
<td></td>
<td></td>
<td></td>
<td>
<textarea rows="3" cols="25" name="div86" id="color86"></textarea>
</td>
</table>

Add the following function in java script and call it on keyup event as below
<textarea rows="3" cols="25" name="div86" id="color86" style='display:none' onkeyup="toggleListOption();"></textarea>
function toggleListOption(){
var el=document.getElementById('color86');
if(el.value===""){
document.getElementById('travel_arriveVia').style.display='block';
}else{
document.getElementById('travel_arriveVia').style.display='none';
}
}

Related

How to select only one row in table with checkbox

I have a table with x numbers of rows and 4 columns, one column is checkbox and other three are readonly selectboxs. I want the user to select just 1 row to be editable by checking checkbox in first column then if he check another checkbox in another row, the checkbox he previously checked get unchecked and row get readonly again.
So I want the user to select 1 row only to edit and others be readonly.
here is my code but it is not working.
$(document).ready(function(){
$('.col1, .col2, .col3').attr('disabled', true)
selectRow();
$('.tbl').on('change', '.selectRow', selectRow);
function selectRow() {
$('.tbl tbody tr').each(function () {
$(this).find('.selectRow').each(function () {
var checkedRow = $(this).closest('tr').find('input:checkbox:checked'),
col1 = $(this).closest('tr').find('.col1'),
col2 = $(this).closest('tr').find('.col2'),
col3 = $(this).closest('tr').find('col3');
if (checkedRow){
$('.col1, .col2, .col3').removeAttr('disabled')
checkedRow.siblings().prop('checked', false);
}else{
$('.col1, .col2, .col3').attr('disabled', true)
checkedRow.siblings().prop('checked', false);
}
});
});
}
});
<table class="tbl">
<tr>
<td><input type="checkbox" name="check1" class = "selectRow" /> </td>
<td>
<select class="col1">
<option id="col1o1">A</option>
<option id="col1o2">B</option>
<option id="col1o3">C</option>
<option id="col1o4">E</option>
</select>
</td>
<td>
<select class="col2">
<option id="col2o1">A</option>
<option id="col2o2">B</option>
<option id="col2o3">C</option>
<option id="col2o4">E</option>
</select>
</td>
<td>
<select class="col3">
<option id="col3o1">A</option>
<option id="col3o2">B</option>
<option id="col3o3">C</option>
<option id="col3o4">E</option>
</select>
</td>
</tr>
<br>
<tr>
<td><input type="checkbox" name="check1" /> </td>
<td>
<select class="s1">
<option id="s1o1">A</option>
<option id="o2">B</option>
<option id="o3">C</option>
<option id="o4">E</option>
</select>
</td>
<td>
<select class="s2">
<option id="s2o1">A</option>
<option id="s2o2">B</option>
<option id="s2o3">C</option>
<option id="s2o4">E</option>
</select>
</td>
<td>
<select class="s3">
<option id="s3o1">A</option>
<option id="s3o2">B</option>
<option id="s3o3">C</option>
<option id="s3o4">E</option>
</select>
</td>
</tr>
<br>
<tr>
<td><input type="checkbox" name="check1" /> </td>
<td>
<select class="s1">
<option id="s1o1">A</option>
<option id="o2">B</option>
<option id="o3">C</option>
<option id="o4">E</option>
</select>
</td>
<td>
<select class="s2">
<option id="s2o1">A</option>
<option id="s2o2">B</option>
<option id="s2o3">C</option>
<option id="s2o4">E</option>
</select>
</td>
<td>
<select class="s3">
<option id="s3o1">A</option>
<option id="s3o2">B</option>
<option id="s3o3">C</option>
<option id="s3o4">E</option>
</select>
</td>
</tr>
</table>
this is my code:

Without jQuery and using event delegation things may be somewhat simpler:
document.addEventListener(`click`, handle);
// disable all selectors initially
document.querySelectorAll(`td select`)
.forEach(s => s.setAttribute(`disabled`, true));
function handle(evt) {
// only do something if a checkbox was clicked
if (evt.target.type === `checkbox`) {
const isChecked = evt.target.checked;
const selectedRow = evt.target.closest(`tr`);
// reset checkboxes, row coloring and disabled state
document.querySelectorAll(`input[type='checkbox']`)
.forEach(cb => {
cb.checked = cb !== evt.target ? false : isChecked;
const row = cb.closest(`tr`);
row.classList[isChecked && row === selectedRow ?
`add` : `remove`](`selected`);
[...row.querySelectorAll(`select`)].filter(r => r !== selectedRow)
.forEach(s => s.setAttribute(`disabled`, true));
selectedRow.querySelectorAll(`select`)
.forEach(s => s[isChecked ?
`removeAttribute` : `setAttribute`](`disabled`, true));
});
}
}
body {
margin: 2rem;
}
tr.selected {
background-color: lightgreen;
}
<table class="tbl">
<tr>
<td><input type="checkbox" name="check1" class="selectRow" /> </td>
<td>
<select class="col1">
<option id="col1o1">A</option>
<option id="col1o2">B</option>
<option id="col1o3">C</option>
<option id="col1o4">E</option>
</select>
</td>
<td>
<select class="col2">
<option id="col2o1">A</option>
<option id="col2o2">B</option>
<option id="col2o3">C</option>
<option id="col2o4">E</option>
</select>
</td>
<td>
<select class="col3">
<option id="col3o1">A</option>
<option id="col3o2">B</option>
<option id="col3o3">C</option>
<option id="col3o4">E</option>
</select>
</td>
</tr>
<br>
<tr>
<td><input type="checkbox" name="check1" /> </td>
<td>
<select class="s1">
<option id="s1o1">A</option>
<option id="o2">B</option>
<option id="o3">C</option>
<option id="o4">E</option>
</select>
</td>
<td>
<select class="s2">
<option id="s2o1">A</option>
<option id="s2o2">B</option>
<option id="s2o3">C</option>
<option id="s2o4">E</option>
</select>
</td>
<td>
<select class="s3">
<option id="s3o1">A</option>
<option id="s3o2">B</option>
<option id="s3o3">C</option>
<option id="s3o4">E</option>
</select>
</td>
</tr>
<br>
<tr>
<td><input type="checkbox" name="check1" /> </td>
<td>
<select class="s1">
<option id="s1o1">A</option>
<option id="o2">B</option>
<option id="o3">C</option>
<option id="o4">E</option>
</select>
</td>
<td>
<select class="s2">
<option id="s2o1">A</option>
<option id="s2o2">B</option>
<option id="s2o3">C</option>
<option id="s2o4">E</option>
</select>
</td>
<td>
<select class="s3">
<option id="s3o1">A</option>
<option id="s3o2">B</option>
<option id="s3o3">C</option>
<option id="s3o4">E</option>
</select>
</td>
</tr>
</table>
Here's an even more simplified version, acting on the table rows
document.addEventListener(`click`, handle);
// create the table dynamically to keep demo lean
createTable();
function handle(evt) {
if (evt.target.type === `checkbox`) {
const selectedRow = evt.target.closest(`tr`);
document.querySelectorAll(`tr`)
.forEach( row => {
// not selected
if (row !== selectedRow) {
row.querySelector(`[type=checkbox]`).checked = false;
row.classList.remove(`selected`);
return row.querySelectorAll(`select`)
.forEach(s => s.setAttribute(`disabled`, true));
}
// selected
row.classList[[`remove`, `add`][+evt.target.checked]](`selected`);
row.querySelectorAll(`select`).forEach(s =>
s[`${[`set`,`remove`][+evt.target.checked]}Attribute`](`disabled`, true));
});
}
}
function createTable() {
const table = document.createElement(`table`);
const repeat = (str, n) => Array(n + 1).join(str);
const select = `<td><select>
<option>A</option>
<option>B</option>
<option>C</option>
<option>E</option></select></td>`;
const row = `<tr>
<td><input type="checkbox" /></td>
${repeat(select, 3)}</tr>`;
table.insertAdjacentHTML(`beforeend`, repeat(row, 3));
document.body.appendChild(table);
// disable all selectors initially
document.querySelectorAll(`td select`)
.forEach(s => s.setAttribute(`disabled`, true));
}
body {
margin: 2rem;
}
tr.selected {
background-color: lightgreen;
}
tr td:nth-child(1) {
padding-right: 6px;
}

The issue is because checkedRow holds a jQuery object. When you use that in an if condition it will always equate to true. You instead need to get the checked property from that element and use that in the condition instead.
Also note that the logic can be made much more succinct and extensible through the use of common selectors instead of incremental ones. In addition, you should look to add the disabled attribute to the HTML directly. Adding it via JS means that there will be a visible flash where the element is loaded as enabled, then when the DOM loads it will be disabled which is not good for your UX.
jQuery($ => {
selectRow();
$('.tbl').on('change', '.selectRow', selectRow);
function selectRow() {
$('.tbl tbody tr').each(function() {
let $row = $(this);
let $checkbox = $row.find('.selectRow');
$row.find('select').prop('disabled', !$checkbox.prop('checked'));
});
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<table class="tbl">
<tr>
<td><input type="checkbox" name="check1" class="selectRow" /> </td>
<td>
<select class="col1" disabled="disabled">
<option id="col1o1">A</option>
<option id="col1o2">B</option>
<option id="col1o3">C</option>
<option id="col1o4">E</option>
</select>
</td>
<td>
<select class="col2" disabled="disabled">
<option id="col2o1">A</option>
<option id="col2o2">B</option>
<option id="col2o3">C</option>
<option id="col2o4">E</option>
</select>
</td>
<td>
<select class="col3" disabled="disabled">
<option id="col3o1">A</option>
<option id="col3o2">B</option>
<option id="col3o3">C</option>
<option id="col3o4">E</option>
</select>
</td>
</tr>
<br>
<tr>
<td><input type="checkbox" name="check1" class="selectRow" /> </td>
<td>
<select class="s1">
<option id="s1o1">A</option>
<option id="o2">B</option>
<option id="o3">C</option>
<option id="o4">E</option>
</select>
</td>
<td>
<select class="s2">
<option id="s2o1">A</option>
<option id="s2o2">B</option>
<option id="s2o3">C</option>
<option id="s2o4">E</option>
</select>
</td>
<td>
<select class="s3">
<option id="s3o1">A</option>
<option id="s3o2">B</option>
<option id="s3o3">C</option>
<option id="s3o4">E</option>
</select>
</td>
</tr>
<br>
<tr>
<td><input type="checkbox" name="check1" class="selectRow" /> </td>
<td>
<select class="s1">
<option id="s1o1">A</option>
<option id="o2">B</option>
<option id="o3">C</option>
<option id="o4">E</option>
</select>
</td>
<td>
<select class="s2">
<option id="s2o1">A</option>
<option id="s2o2">B</option>
<option id="s2o3">C</option>
<option id="s2o4">E</option>
</select>
</td>
<td>
<select class="s3">
<option id="s3o1">A</option>
<option id="s3o2">B</option>
<option id="s3o3">C</option>
<option id="s3o4">E</option>
</select>
</td>
</tr>
</table>

This works great! uncheck all checkboxes except the one having current focus '.tbl [type="checkbox"]:not(:focus)' then manipulate the select boxes
$(document).ready(function(){
$('.tbl [type="checkbox"]').on('click', function() {
$('.tbl [type="checkbox"]:not(:focus)').prop('checked', false);
$('.tbl select').attr('disabled', true);
$(this).parent().parent().find('select').attr('disabled', !$(this).prop('checked'));
});
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<table class="tbl">
<tr>
<td><input type="checkbox" name="check1" class = "selectRow" /> </td>
<td>
<select class="col1" disabled>
<option id="col1o1">A</option>
<option id="col1o2">B</option>
<option id="col1o3">C</option>
<option id="col1o4">E</option>
</select>
</td>
<td>
<select class="col2" disabled>
<option id="col2o1">A</option>
<option id="col2o2">B</option>
<option id="col2o3">C</option>
<option id="col2o4">E</option>
</select>
</td>
<td>
<select class="col3" disabled>
<option id="col3o1">A</option>
<option id="col3o2">B</option>
<option id="col3o3">C</option>
<option id="col3o4">E</option>
</select>
</td>
</tr>
<br>
<tr>
<td><input type="checkbox" name="check1" /> </td>
<td>
<select class="s1" disabled>
<option id="s1o1">A</option>
<option id="o2">B</option>
<option id="o3">C</option>
<option id="o4">E</option>
</select>
</td>
<td>
<select class="s2" disabled>
<option id="s2o1">A</option>
<option id="s2o2">B</option>
<option id="s2o3">C</option>
<option id="s2o4">E</option>
</select>
</td>
<td>
<select class="s3" disabled>
<option id="s3o1">A</option>
<option id="s3o2">B</option>
<option id="s3o3">C</option>
<option id="s3o4">E</option>
</select>
</td>
</tr>
<br>
<tr>
<td><input type="checkbox" name="check1" /> </td>
<td>
<select class="s1" disabled>
<option id="s1o1">A</option>
<option id="o2">B</option>
<option id="o3">C</option>
<option id="o4">E</option>
</select>
</td>
<td>
<select class="s2" disabled>
<option id="s2o1">A</option>
<option id="s2o2">B</option>
<option id="s2o3">C</option>
<option id="s2o4">E</option>
</select>
</td>
<td>
<select class="s3" disabled>
<option id="s3o1">A</option>
<option id="s3o2">B</option>
<option id="s3o3">C</option>
<option id="s3o4">E</option>
</select>
</td>
</tr>
</table>

two select options - validate and hide option not needed

I'm trying to show a set of select option base on what is selected on another select option. I have some issue to understand the logic with the js script.
Example:
Any advice how to hide the other options which are not used
if TV show only value device, tsignal, blackscreen, other
If Radio show only the value: device, rsignal, other
$('#new').find('option').not('[value="device"]').remove();
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/2.2.1/jquery.min.js"></script>
<form>
<table>
<tbody>
<tr>
<td>Issue:</td>
<td>
<select required id="test" name="test">
<option value="" disabled selected>Choose an option</option>
<option value="tv">tv</option>
<option value="radio">radio</option>
</select>
</td>
</tr>
<tr>
<td height="50px" colspan="3"></td>
</tr>
<tr>
<td>What is the problem?</td>
<td>
<select id="new" name="new">
<option value="" disabled selected>Select an option</option>
<option value="device">device is defect</option>
<option value="rsignal">radio has no signal</option>
<option value="tsignal">radio has no signal</option>
<option value="blackscreen">tv blackscreen</option>
<option value="other">Other</option>
</select>
</td>
</tr>
<tr>
<td><input type="submit" class="submit" value="submit"></td>
</tr>
</tbody>
</table>
</form>

I guess that you meant to use .change so when #test dropdown changed you check what its value and based on that show / hide options, right?
$('#test').change(function() {
const options = $('#new').find('option').show();
if ($(this).val() === 'tv') {
options.not('[value="device"]').hide();
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/2.2.1/jquery.min.js"></script>
<form>
<table>
<tbody>
<tr>
<td>Issue:</td>
<td>
<select required id="test" name="test">
<option value="" disabled selected>Choose an option</option>
<option value="tv">tv</option>
<option value="radio">radio</option>
</select>
</td>
</tr>
<tr>
<td height="50px" colspan="3"></td>
</tr>
<tr>
<td>What is the problem?</td>
<td>
<select id="new" name="new">
<option value="" disabled selected>Select an option</option>
<option value="device">device is defect</option>
<option value="rsignal">radio has no signal</option>
<option value="tsignal">radio has no signal</option>
<option value="blackscreen">tv blackscreen</option>
<option value="other">Other</option>
</select>
</td>
</tr>
<tr>
<td><input type="submit" class="submit" value="submit"></td>
</tr>
</tbody>
</table>
</form>
Notice Hide option is not cross browser

show multi select id by js

I need show selection id by js, by this code only show 1 and first select id
my code is this html and javascript
<tr>
<td>
<select name="jens_id[]" id="jens_id" required="" >
<option ></option>
<option >1</option>
<option >2</option>
</select>
</td>
</tr>
<tr>
<td>
<select name="jens_id[]" id="jens_id" required="" >
<option ></option>
<option >1</option>
<option >2</option>
</select>
</td>
</tr>
<script>
$(document).ready(function(){
$('#jens_id').change(function(){
statteId = $("#jens_id").val()
alert(statteId);
});
});
</script>
can help for edit script

The id attribute should be unique within the page otherwise only the first one gets selected(using id selector), for a group of elements use a common class instead and within the change event handler use this to refer the clicked element.
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<table>
<tr>
<td>
<select name="jens_id[]" class="jens_id" required="">
<option ></option>
<option >1</option>
<option >2</option>
</select>
</td>
<td></td>
</tr>
<tr>
<td>
<select name="jens_id[]" class="jens_id" required="">
<option ></option>
<option >1</option>
<option >2</option>
</select>
</td>
<td></td>
</tr>
</table>
<script>
$(document).ready(function() {
// or use attribute equals selector
// $('[name="jens_id[]"]')
$('.jens_id').change(function() {
statteId = $(this).val(); // or this.value
console.log(statteId);
// get the td and update with value
$(this).parent().next().text(statteId);
});
});
</script>

Try with each() function of jquery .And change the selector with Tagname or ClassName instead of id .Id is a unique for full document
$(document).ready(function() {
$('select').each(function(){
console.log($(this).val())
})
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<tr>
<td>
<select name="jens_id[]" id="jens_id" required="">
<option ></option>
<option selected>1</option>
<option >2</option>
</select>
</td>
</tr>
<tr>
<td>
<select name="jens_id[]" id="jens_id" required="">
<option ></option>
<option >1</option>
<option selected>2</option>
</select>
</td>
</tr>

$(document).ready(function() {
$('.jens_id').change(function() {
statteId = $('option:selected', this).text()
alert(statteId);
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<select name="jens_id[]" class="jens_id" required="">
<option ></option>
<option >1</option>
<option >2</option>
</select>
<select name="jens_id[]" class="jens_id" required="">
<option ></option>
<option >3</option>
<option >4</option>
</select>
ID should be unique, use class and use this context to tell the current changed select

You are already aware now that id of the element on page should be unique.
When you have multiple elements with same id then id(#) selector returns the first matched element. So as mentioned in other answers you should use class if possible.
By any reason if you can't use the class and want to find with id then you can use it like $('select#jens_id') or $('[id="jens_id"]') and to get the selected option use context to this which will find the selected option for changed select element.
$(document).ready(function() {
$('select#jens_id').change(function() {
alert($(this).find('option:selected').text());
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<select name="jens_id[]" id="jens_id" required="">
<option ></option>
<option >1</option>
<option >2</option>
</select>
<select name="jens_id[]" id="jens_id" required="">
<option ></option>
<option >3</option>
<option >4</option>
</select>
Add multiple attribute to select if multiple values needs to be selected.

JQuery does not work but last element in all browsers

I am writing a web application for capturing applicant data. I am using JQuery for hiding and showing html tables. The code snippet is
<script type="text/javascript" src="jquery.min.js"></script>
<script language="javascript" type="text/javascript">
function hideDD(){
var gndr = $('#gender').val();
if(gndr=="Female"){
$("#table_dd").hide();
$("#dd_bank").val('');
$("#dd_number").val('');
$("#dd_date").val('');
}
else
{
$("#table_dd").show();
}
var cat = $('#category').val();
if(cat=="SC" || cat=="ST"){
$("#table_dd").hide();
$("#dd_bank").val('');
$("#dd_number").val('');
$("#dd_date").val('');
}
else
{
$("#table_dd").show();
}
var xsrv = $('#exsrv').val();
if(xsrv=="Yes"){
$("#table_dd").hide();
$("#dd_bank").val('');
$("#dd_number").val('');
$("#dd_date").val('');
}
else
{
$("#table_dd").show();
}
var PD = $('#PWDPH').val();
if(PD=="Yes"){
$("#table_dd").hide();
$("#dd_bank").val('');
$("#dd_number").val('');
$("#dd_date").val('');
}
else
{
$("#table_dd").show();
}
}
and the html part is
<tr>
<td bgcolor="#FFF3D5">5. Gender :<span class="style2">*</span></td>
<td bgcolor="#FFF3D5"><select name="gender" id="gender" onclick="hideDD()">
<option value="">Select</option>
<option value="Male">Male</option>
<option value="Female">Female</option>
</select>
</td>
<!-- <div id="gender">
Please select whichever is applicable to you <select name="gender" id="gender">
<option value="">Select</option>
<option value="Male">Male</option>
<option value="Female">Female</option>
</select>
</div> -->
</tr>
<tr>
<td bgcolor="#FFF3D5">6. Marital Status :<span class="style2">*</span></td>
<td bgcolor="#FFF3D5"><select name="maritalstatus" id="maritalstatus">
<option value="">Select</option>
<option value="Married">Married</option>
<option value="Unmarried">Unmarried</option>
<option value="Widow">Widow</option>
<option value="Divorced">Divorced</option>
<option value="Judicially separated and not married">Judicially separated and not married</option>
</select>
</td>
</tr>
<tr>
<td bgcolor="#FFF3D5">7. Date of Birth: <span class="style2">*</span></td>
<td bgcolor="#FFF3D5"><input name="dateofbirth" type="text" id="dateofbirth" value="<?php echo "$rs1->dateofbirth" ?>" readonly /><span class="style2">(yyyy/mm/dd)</span>
Your age(as on 31st July 2015):<input name="ageyear" type="text" id="ageyear" size="2" readonly>years<input name="agemonth" type="text" id="agemonth" size="2" readonly>months and<input name="ageday" type="text" id="ageday" size="2" readonly>days
</td>
</tr>
<tr>
<td bgcolor="#FFF3D5">8. Email:<span class="style2">*</span></td>
<td bgcolor="#FFF3D5"><input name="afc_email" type="text" id="afc_email" value="<?php echo "$rs1->email" ?>" readonly />
</td>
</tr>
<tr>
<td bgcolor="#FFF3D5">9. Category :<span class="style2">*</span></td>
<td bgcolor="#FFF3D5"><select name="category" id="category" onclick="hideDD()">
<option value="">Select</option>
<option value="General">General</option>
<option value="OBC">OBC</option>
<option value="SC">SC</option>
<option value="ST">ST</option>
</select>
</td>
</tr>
<tr>
<td bgcolor="#FFF3D5">10 : You are a citizen of India by<span class="style2">*</span></td>
<td bgcolor="#FFF3D5"><select name="citizen" id="citizen">
<option value="">Select</option>
<option value="Birth">Birth</option>
<option value="Domicile">Domicile</option>
</select>
</td>
</tr>
<tr>
<td bgcolor="#FFF3D5">11 : Religion<span class="style2">*</span></td>
<td bgcolor="#FFF3D5"><select name="religion" id="religion">
<option value="">Select</option>
<option value="Hindu">Hindu</option>
<option value="Muslims">Muslims</option>
<option value="Christians">Christians</option>
<option value="Sikhs">Sikhs</option>
<option value="Buddhists">Buddhists</option>
<option value="Zoroastrians">Zoroastrians</option>
<option value="Others">Others</option>
</select>
</td>
</tr>
<tr>
<td bgcolor="#FFF3D5">12 : Whether Ex-servicemen<span class="style2">*</span></td>
<td bgcolor="#FFF3D5"><select name="exsrv" id="exsrv" onclick="enb_dis(); hideDD()">
<option value="">Select</option>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
<table name="table_exserve" id="table_exserve" border="1">
<tr>
<td>Have you already secured employment in civil side under central Govt. in Group C and D in regular basis after availing this benefit</td>
<td bgcolor="#FFF3D5"><select name="exsrv_benefit" id="exsrv_benefit">
<option value="">Select</option>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select> </td>
</tr>
<tr>
<td>Date of appoinment in arm force</td>
<td bgcolor="#FFF3D5"><input name="exsrv_from" type="text" id="exsrv_from" maxlength="10"/><span class="style2">(yyyy/mm/dd)</span></td>
</tr>
<tr>
<td>Date of discharge / due date of discharge from arm force</td>
<td bgcolor="#FFF3D5"><input name="exsrv_to" type="text" id="exsrv_to" maxlength="10" onchange="milical()"/><span class="style2">(yyyy/mm/dd)</span></td>
</tr>
<tr>
<td>Length of actual Military services</td>
<td bgcolor="#FFF3D5"><input name="miliyear" type="text" id="miliyear" size="2" readonly>years<input name="milimonth" type="text" id="milimonth" size="2" readonly>months and<input name="miliday" type="text" id="miliday" size="2" readonly>days</td>
</tr>
</table>
</tr>
<tr>
<td bgcolor="#FFF3D5">13 : Whether person with disability(PWD) / Physically handicapped (PH)<span class="style2">*</span></td>
<td bgcolor="#FFF3D5"><select name="PWDPH" id="PWDPH" onclick="enb_dis(); hideDD()">
<option value="">Select</option>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
<table name="table_PWDPH" id="table_PWDPH" border="1">
<tr>
<td>Nature of disability</td>
<td bgcolor="#FFF3D5"><select name="PWDPH_nature" id="PWDPH_nature">
<option value="">Select</option>
<option value="B">B</option>
<option value="LV">LV</option>
<option value="PD">PD</option>
<option value="D">D</option>
<option value="OA">OA</option>
<option value="OL">OL</option>
<option value="BL">BL</option>
</select> </td>
</tr>
<tr>
<td>Degree of disability</td>
<td bgcolor="#FFF3D5"><select name="PWDPH_degree" id="PWDPH_degree">
<option value="">Select</option>
<option value="40">40</option>
<option value="41">41</option>
<option value="42">42</option>
<option value="43">43</option>
<option value="44">44</option>
<option value="45">45</option>
<option value="46">46</option>
<option value="47">47</option>
<option value="48">48</option>
<option value="49">49</option>
<option value="50">50</option>
<option value="51">51</option>
<option value="52">52</option>
<option value="53">53</option>
<option value="54">54</option>
<option value="55">55</option>
<option value="56">56</option>
<option value="57">57</option>
<option value="58">58</option>
<option value="59">59</option>
<option value="60">60</option>
<option value="61">61</option>
<option value="62">62</option>
<option value="63">63</option>
<option value="64">64</option>
<option value="65">65</option>
<option value="66">66</option>
<option value="67">67</option>
<option value="68">68</option>
<option value="69">69</option>
<option value="70">70</option>
<option value="71">71</option>
<option value="72">72</option>
<option value="73">73</option>
<option value="74">74</option>
<option value="75">75</option>
<option value="76">76</option>
<option value="77">77</option>
<option value="78">78</option>
<option value="79">79</option>
<option value="80">80</option>
<option value="81">81</option>
<option value="82">82</option>
<option value="83">83</option>
<option value="84">84</option>
<option value="85">85</option>
<option value="86">86</option>
<option value="87">87</option>
<option value="88">88</option>
<option value="89">89</option>
<option value="90">90</option>
<option value="91">91</option>
<option value="92">92</option>
<option value="93">93</option>
<option value="94">94</option>
<option value="95">95</option>
<option value="96">96</option>
<option value="97">97</option>
<option value="98">98</option>
<option value="99">99</option>
<option value="100">100</option>
</select>
</td>
</tr>
</table>
</tr>
Every time I did modification, the last jQuery item worked fine, rests did not work. For example in this code only PWDPD element worked fine, category and gender did not worked fine.

I've made several changes in your code like <table> tag was not not implemented properly and without that you had <tr> at beginning. So after editing all those things your code goes as below:
I've kept an alert inside your function which shows up on each element you have called that function and I've change onclick to onchange for your select element.
function hideDD() {
var gndr = $('#gender').val();
alert(gndr);
if(gndr=="Female"){
$("#table_dd").hide();
$("#dd_bank").val('');
$("#dd_number").val('');
$("#dd_date").val('');
}
else
{
$("#table_dd").show();
}
var cat = $('#category').val();
if(cat=="SC" || cat=="ST"){
$("#table_dd").hide();
$("#dd_bank").val('');
$("#dd_number").val('');
$("#dd_date").val('');
}
else
{
$("#table_dd").show();
}
var xsrv = $('#exsrv').val();
if(xsrv=="Yes"){
$("#table_dd").hide();
$("#dd_bank").val('');
$("#dd_number").val('');
$("#dd_date").val('');
}
else
{
$("#table_dd").show();
}
var PD = $('#PWDPH').val();
if(PD=="Yes"){
$("#table_dd").hide();
$("#dd_bank").val('');
$("#dd_number").val('');
$("#dd_date").val('');
}
else
{
$("#table_dd").show();
}
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<table>
<tr>
<td bgcolor="#FFF3D5">5. Gender :<span class="style2">*</span></td>
<td bgcolor="#FFF3D5">
<select id="gender" onchange="hideDD()">
<option value="Select">Select</option>
<option value="Male">Male</option>
<option value="Female">Female</option>
</select>
</td>
</tr>
<tr>
<td bgcolor="#FFF3D5">6. Marital Status :<span class="style2">*</span></td>
<td bgcolor="#FFF3D5">
<select name="maritalstatus" id="maritalstatus">
<option value="">Select</option>
<option value="Married">Married</option>
<option value="Unmarried">Unmarried</option>
<option value="Widow">Widow</option>
<option value="Divorced">Divorced</option>
<option value="Judicially separated and not married">Judicially separated and not married</option>
</select>
</td>
</tr>
<tr>
<td bgcolor="#FFF3D5">7. Date of Birth: <span class="style2">*</span></td>
<td bgcolor="#FFF3D5"><input name="dateofbirth" type="text" id="dateofbirth" value="<?php echo "$rs1->dateofbirth" ?>" readonly />
<span class="style2">(yyyy/mm/dd)</span>
Your age(as on 31st July 2015):<input name="ageyear" type="text" id="ageyear" size="2" readonly>years<input name="agemonth" type="text" id="agemonth" size="2" readonly>months and<input name="ageday" type="text" id="ageday" size="2" readonly>days
</td>
</tr>
<tr>
<td bgcolor="#FFF3D5">8. Email:<span class="style2">*</span></td>
<td bgcolor="#FFF3D5"><input name="afc_email" type="text" id="afc_email" value="<?php echo "$rs1->email" ?>" readonly /></td>
</tr>
<tr>
<td bgcolor="#FFF3D5">9. Category :<span class="style2">*</span></td>
<td bgcolor="#FFF3D5">
<select name="category" id="category" onchange="hideDD()">
<option value="">Select</option>
<option value="General">General</option>
<option value="OBC">OBC</option>
<option value="SC">SC</option>
<option value="ST">ST</option>
</select>
</td>
</tr>
<tr>
<td bgcolor="#FFF3D5">10 : You are a citizen of India by<span class="style2">*</span></td>
<td bgcolor="#FFF3D5">
<select name="citizen" id="citizen">
<option value="">Select</option>
<option value="Birth">Birth</option>
<option value="Domicile">Domicile</option>
</select>
</td>
</tr>
<tr>
<td bgcolor="#FFF3D5">11 : Religion<span class="style2">*</span></td>
<td bgcolor="#FFF3D5">
<select name="religion" id="religion">
<option value="">Select</option>
<option value="Hindu">Hindu</option>
<option value="Muslims">Muslims</option>
<option value="Christians">Christians</option>
<option value="Sikhs">Sikhs</option>
<option value="Buddhists">Buddhists</option>
<option value="Zoroastrians">Zoroastrians</option>
<option value="Others">Others</option>
</select>
</td>
</tr>
<tr>
<td bgcolor="#FFF3D5">12 : Whether Ex-servicemen<span class="style2">*</span></td>
<td bgcolor="#FFF3D5">
<select name="exsrv" id="exsrv" onchange="hideDD()">
<option value="">Select</option>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
<table name="table_exserve" id="table_exserve" border="1">
<tr>
<td>Have you already secured employment in civil side under central Govt. in Group C and D in regular basis after availing this benefit</td>
<td bgcolor="#FFF3D5">
<select name="exsrv_benefit" id="exsrv_benefit">
<option value="">Select</option>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
</td>
</tr>
<tr>
<td>Date of appoinment in arm force</td>
<td bgcolor="#FFF3D5"><input name="exsrv_from" type="text" id="exsrv_from" maxlength="10"/><span class="style2">(yyyy/mm/dd)</span></td>
</tr>
<tr>
<td>Date of discharge / due date of discharge from arm force</td>
<td bgcolor="#FFF3D5"><input name="exsrv_to" type="text" id="exsrv_to" maxlength="10" onchange="milical()"/><span class="style2">(yyyy/mm/dd)</span></td>
</tr>
<tr>
<td>Length of actual Military services</td>
<td bgcolor="#FFF3D5"><input name="miliyear" type="text" id="miliyear" size="2" readonly>years<input name="milimonth" type="text" id="milimonth" size="2" readonly>months and<input name="miliday" type="text" id="miliday" size="2" readonly>days</td>
</tr>
</table>
</td>
</tr>
<tr>
<td bgcolor="#FFF3D5">13 : Whether person with disability(PWD) / Physically handicapped (PH)<span class="style2">*</span></td>
<td bgcolor="#FFF3D5">
<select name="PWDPH" id="PWDPH" onchange="hideDD();">
<option value="">Select</option>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
<table name="table_PWDPH" id="table_PWDPH" border="1">
<tr>
<td>Nature of disability</td>
<td bgcolor="#FFF3D5">
<select name="PWDPH_nature" id="PWDPH_nature">
<option value="">Select</option>
<option value="B">B</option>
<option value="LV">LV</option>
<option value="PD">PD</option>
<option value="D">D</option>
<option value="OA">OA</option>
<option value="OL">OL</option>
<option value="BL">BL</option>
</select>
</td>
</tr>
<tr>
<td>Degree of disability</td>
<td bgcolor="#FFF3D5">
<select name="PWDPH_degree" id="PWDPH_degree">
<option value="">Select</option>
<option value="40">40</option>
<option value="41">41</option>
<option value="42">42</option>
<option value="43">43</option>
<option value="44">44</option>
<option value="45">45</option>
<option value="46">46</option>
<option value="47">47</option>
<option value="48">48</option>
<option value="49">49</option>
<option value="50">50</option>
<option value="51">51</option>
<option value="52">52</option>
<option value="53">53</option>
<option value="54">54</option>
<option value="55">55</option>
<option value="56">56</option>
<option value="57">57</option>
<option value="58">58</option>
<option value="59">59</option>
<option value="60">60</option>
<option value="61">61</option>
<option value="62">62</option>
<option value="63">63</option>
<option value="64">64</option>
<option value="65">65</option>
<option value="66">66</option>
<option value="67">67</option>
<option value="68">68</option>
<option value="69">69</option>
<option value="70">70</option>
<option value="71">71</option>
<option value="72">72</option>
<option value="73">73</option>
<option value="74">74</option>
<option value="75">75</option>
<option value="76">76</option>
<option value="77">77</option>
<option value="78">78</option>
<option value="79">79</option>
<option value="80">80</option>
<option value="81">81</option>
<option value="82">82</option>
<option value="83">83</option>
<option value="84">84</option>
<option value="85">85</option>
<option value="86">86</option>
<option value="87">87</option>
<option value="88">88</option>
<option value="89">89</option>
<option value="90">90</option>
<option value="91">91</option>
<option value="92">92</option>
<option value="93">93</option>
<option value="94">94</option>
<option value="95">95</option>
<option value="96">96</option>
<option value="97">97</option>
<option value="98">98</option>
<option value="99">99</option>
<option value="100">100</option>
</select>
</td>
</tr>
</table>
</td>
</tr>
</table>

try place you code inside:
$(document).ready(function(){
YOUR CODE HERE
});

Stop URL parameters being added on submit of form

Okay, so this may be a stupid question, but I'm attempting to write a simple JavaScript app-thing (please excuse my terminology, I'm new to this) which includes a form, except I'm doing it using only HTML and JS (and CSS), so I'm accessing the values in the form by using document.getElementById.
The thing is the Javascript function is supposed to display something, based on the form values (it's basically a GPA calculator), but the things to display simply flash on the screen, and then disappear when I run the HTML file as is, and don't show up at all when I run it through my actual domain. I feel like the reason for this is that after you submit the form, a bunch of URL parameters get tacked on, thus refreshing the HTML, and deleting the newly added innerHTML.
Here's the code for my form:
<form id="calculator" name="calculator">
<table>
<thead>
<tr>
<td>Class Number</td>
<td>Grade</td>
<td>AP/Non-AP</td>
<td>GPA</td>
</tr>
</thead>
<tbody>
<tr>
<td class="classnumber">Class 1</td>
<td>
<select id="class1GPA" name="class1GPA">
<option value=4.4 selected>A+</option>
<option value=4.0>A</option>
<option value=3.7>A-</option>
<option value=3.4>B+</option>
<option value=3.0>B</option>
<option value=2.7>B-</option>
<option value=2.4>C+</option>
<option value=2.0>C</option>
<option value=1.7>C-</option>
<option value=1.4>D+</option>
<option value=1.0>D</option>
<option value=0.7>D-</option>
<option value=0>F</option>
</select>
</td>
<td>
<select id="class1AP" name="class1AP">
<option value=False selected>Regular Class</option>
<option value=True>AP Class</option>
</select>
</td>
<td id="class1disp">
</td>
</tr>
<tr>
<td class="classnumber">Class 2</td>
<td>
<select id="class2GPA" name="class2GPA">
<option value=4.4 selected>A+</option>
<option value=4.0>A</option>
<option value=3.7>A-</option>
<option value=3.4>B+</option>
<option value=3.0>B</option>
<option value=2.7>B-</option>
<option value=2.4>C+</option>
<option value=2.0>C</option>
<option value=1.7>C-</option>
<option value=1.4>D+</option>
<option value=1.0>D</option>
<option value=0.7>D-</option>
<option value=0>F</option>
</select>
</td>
<td>
<select id="class2AP" name="class2AP">
<option value=False selected>Regular Class</option>
<option value=True>AP Class</option>
</select>
</td>
<td id="class2disp">
</td>
</tr>
<tr>
<td class="classnumber">Class 3</td>
<td>
<select id="class3GPA" name="class3GPA">
<option value=4.4 selected>A+</option>
<option value=4.0>A</option>
<option value=3.7>A-</option>
<option value=3.4>B+</option>
<option value=3.0>B</option>
<option value=2.7>B-</option>
<option value=2.4>C+</option>
<option value=2.0>C</option>
<option value=1.7>C-</option>
<option value=1.4>D+</option>
<option value=1.0>D</option>
<option value=0.7>D-</option>
<option value=0>F</option>
</select>
</td>
<td>
<select id="class3AP" name="class3AP">
<option value=False selected>Regular Class</option>
<option value=True>AP Class</option>
</select>
</td>
<td id="class3disp">
</td>
</tr>
<tr>
<td class="classnumber">Class 4</td>
<td>
<select id="class4GPA" name="class4GPA">
<option value=4.4 selected>A+</option>
<option value=4.0>A</option>
<option value=3.7>A-</option>
<option value=3.4>B+</option>
<option value=3.0>B</option>
<option value=2.7>B-</option>
<option value=2.4>C+</option>
<option value=2.0>C</option>
<option value=1.7>C-</option>
<option value=1.4>D+</option>
<option value=1.0>D</option>
<option value=0.7>D-</option>
<option value=0>F</option>
</select>
</td>
<td>
<select id="class4AP" name="class4AP">
<option value=False selected>Regular Class</option>
<option value=True>AP Class</option>
</select>
</td>
<td id="class4disp">
</td>
</tr>
<tr>
<td class="classnumber">Class 5</td>
<td>
<select id="class5GPA" name="class5GPA">
<option value=4.4 selected>A+</option>
<option value=4.0>A</option>
<option value=3.7>A-</option>
<option value=3.4>B+</option>
<option value=3.0>B</option>
<option value=2.7>B-</option>
<option value=2.4>C+</option>
<option value=2.0>C</option>
<option value=1.7>C-</option>
<option value=1.4>D+</option>
<option value=1.0>D</option>
<option value=0.7>D-</option>
<option value=0>F</option>
</select>
</td>
<td>
<select id="class5AP" name="class5AP">
<option value=False selected>Regular Class</option>
<option value=True>AP Class</option>
</select>
</td>
<td id="class5disp">
</td>
</tr>
<tr>
<td class="classnumber">Class 6</td>
<td>
<select id="class6GPA" name="class6GPA">
<option value=4.4 selected>A+</option>
<option value=4.0>A</option>
<option value=3.7>A-</option>
<option value=3.4>B+</option>
<option value=3.0>B</option>
<option value=2.7>B-</option>
<option value=2.4>C+</option>
<option value=2.0>C</option>
<option value=1.7>C-</option>
<option value=1.4>D+</option>
<option value=1.0>D</option>
<option value=0.7>D-</option>
<option value=0>F</option>
</select>
</td>
<td>
<select id="class6AP" name="class6AP">
<option value=False selected>Regular Class</option>
<option value=True>AP Class</option>
</select>
</td>
<td id="class6disp">
</td>
</tr>
<tr>
<td class="classnumber">Class 7</td>
<td>
<select id="class7GPA" name="class7GPA">
<option value="none">N/A</option>
<option value=4.4 selected>A+</option>
<option value=4.0>A</option>
<option value=3.7>A-</option>
<option value=3.4>B+</option>
<option value=3.0>B</option>
<option value=2.7>B-</option>
<option value=2.4>C+</option>
<option value=2.0>C</option>
<option value=1.7>C-</option>
<option value=1.4>D+</option>
<option value=1.0>D</option>
<option value=0.7>D-</option>
<option value=0>F</option>
</select>
</td>
<td>
<select id="class7AP" name="class7AP">
<option value=False selected>Regular Class</option>
<option value=True>AP Class</option>
</select>
</td>
<td id="class7disp">
</td>
</tr>
<tr>
<td class="classnumber">Class 8</td>
<td>
<select id="class8GPA" name="class8GPA">
<option value="none">N/A</option>
<option value=4.4 selected>A+</option>
<option value=4.0>A</option>
<option value=3.7>A-</option>
<option value=3.4>B+</option>
<option value=3.0>B</option>
<option value=2.7>B-</option>
<option value=2.4>C+</option>
<option value=2.0>C</option>
<option value=1.7>C-</option>
<option value=1.4>D+</option>
<option value=1.0>D</option>
<option value=0.7>D-</option>
<option value=0>F</option>
</select>
</td>
<td>
<select id="class8AP" name="class8AP">
<option value=False selected>Regular Class</option>
<option value=True>AP Class</option>
</select>
</td>
<td id="class8disp">
</td>
</tr>
</br>
</tbody>
</table>
<input onClick="showGPA()" id="submit" type="submit" value="Calculate!"/>
</form>
And the Javascript that is supposed to process it (it doesn't actually display an average yet, but that's less important than figuring out why it just flashes/doesn't display):
function showGPA() {
var grades = {};
grades.classesNumber = 6
if (document.getElementById('class1AP').value === "True") {
grades.class1 = parseFloat(document.getElementById('class1GPA').value) + 0.5;
} else {
grades.class1 = parseFloat(document.getElementById('class1GPA').value);
}
document.getElementById('class1disp').innerHTML = grades.class1.toFixed(1);
if (document.getElementById('class2AP').value === "True") {
grades.class2 = parseFloat(document.getElementById('class2GPA').value) + 0.5;
} else {
grades.class2 = parseFloat(document.getElementById('class2GPA').value);
}
document.getElementById('class2disp').innerHTML = grades.class2.toFixed(1);
if (document.getElementById('class3AP').value === "True") {
grades.class3 = parseFloat(document.getElementById('class3GPA').value) + 0.5;
} else {
grades.class3 = parseFloat(document.getElementById('class3GPA').value);
}
document.getElementById('class3disp').innerHTML = grades.class3.toFixed(1);
if (document.getElementById('class4AP').value === "True") {
grades.class4 = parseFloat(document.getElementById('class4GPA').value) + 0.5;
} else {
grades.class4 = parseFloat(document.getElementById('class4GPA').value);
}
document.getElementById('class4disp').innerHTML = grades.class4.toFixed(1);
if (document.getElementById('class5AP').value === "True") {
grades.class5 = parseFloat(document.getElementById('class5GPA').value) + 0.5;
} else {
grades.class5 = parseFloat(document.getElementById('class5GPA').value);
}
document.getElementById('class5disp').innerHTML = grades.class5.toFixed(1);
if (document.getElementById('class6AP').value === "True") {
grades.class6 = parseFloat(document.getElementById('class6GPA').value) + 0.5;
} else {
grades.class6 = parseFloat(document.getElementById('class6GPA').value);
}
document.getElementById('class6disp').innerHTML = grades.class6.toFixed(1);
if (document.getElementById('class7GPA').value !== "none") {
if (document.getElementById('class7AP').value === "True") {
grades.class7 = parseFloat(document.getElementById('class7GPA').value) + 0.5;
} else {
grades.class7 = parseFloat(document.getElementById('class7GPA').value);
}
document.getElementById('class7disp').innerHTML = grades.class7.toFixed(1);
grades.classesNumber++;
} else {
grades.class7 = 0;
}
if (document.getElementById('class8GPA').value !== "none") {
if (document.getElementById('class8AP').value === "True") {
grades.class8 = parseFloat(document.getElementById('class8GPA').value) + 0.5;
} else {
grades.class8 = parseFloat(document.getElementById('class8GPA').value);
}
document.getElementById('class8disp').innerHTML = grades.class8.toFixed(1);
grades.classesNumber++;
} else {
grades.class8 = 0;
}
}
How is it possible for me to stop 16 different URL parameters from being added on when the form submits?
Now my guess as to why it doesn't work may be completely wrong, as I said, I'm new to this. (While trying to make this work, I noticed that one of the problems was that I spelt .innerHTML as .innnerHTML)
But if someone could help me make this work, preferably without learning PHP or something, that would be great. Thanks!

When you submit a form, it will do an HTTP post to the action you specify. If you're looking to run some javascript on your form here, and stop it from posting, add 'return false' on your submit.
http://jsbin.com/icobam/2/edit
<form id="calculator" name="calculator" onsubmit="return false;">

<form id="calculator" name="calculator" onsubmit='showGPA();' method="post">
Inserting method="post" will stop the form from adding parameters in the URL.

Remove the onclick statement from the submit button:
<input onClick="showGPA()" id="submit"
to
<input id="submit"
Change the form to:
<form id="calculator" name="calculator" onsubmit='showGPA(); return false;'>
Note: if there are any javascript errors within the showGPA function then the form will be submitted and cause a page refresh. The only way to prevent this is to ensure that there are no javascript errors.

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