Changing visibility of an element on click

Changing visibility of an element on click - javascript

<table id="selectsupp">
<tr>
<td>
<select id="category">
<option value="display" readonly="true">-Shop By Category-</option>
<option value="all">All</option>
<option value="preworkout">Pre Workout</option>
<option value="protein">Protein</option>
<option value="mass">Mass Gainer</option>
<option value="bcaa">BCAA</option>
</select>
</td>
</tr>
<tr>
<td>
<select id="company">
<option value="display" readonly="true">-Shop By Company-</option>
<option value="all">All</option>
<option value="on">Optimum Nutrition</option>
<option value="mts">MTS</option>
<option value="mutant">Mutant Nutrition</option>
<option value="allmax">All Max</option>
</select>
</td>
<td>
<input type="submit" id="submit" name="search" value="Search" onclick="find()"/>
</td>
</tr>
</table>
<script>
function find(){
var category = document.getElementById('category');
var valueOfCategory = category.options[category.selectedIndex].value;
var company = document.getElementById('company');
var valueOfCompany = company.options[company.selectedIndex].value;
if (valueOfCategory === "all" && valueOfCompany === "all") {
alert "hello";
document.getElementsByTagName("select")[0].style.visibility = "hidden";
document.getElementsByTagName("select")[1].style.visibility = "hidden";
//display all suggested items
}
Hello fellow coders :) I am having some trouble with setting the visibility of a tag. When I submit i am trying to get rid of the 2 select options and the button also but for some reason It setting .style.visibility = "hidden" is not working. Any suggestions?

Two problems are there
alert "hello";
should be
alert("hello");
And there is } missing at the end of function. And I don't see closing of script tag also.

Well, if you'd bothered checking your browser's debug console, you'd have seen your syntax errors getting logged there:
alert "hello";
should be
alert("hello");
The debug console should be your FIRST stop anytime something on a web page isn't working.

Related

Open Single Button To Multiple Pages

How can I open different pages from a single button by using a pair of two different dropdown menus?
<table style="font-style:nunito; background-color:#FFEBF6;border:none;">
<tr>
<td style="font-style:nunito; background-color:#FFEBF6;border:none;">
<label style="font-size:20px; padding-bottom:10px;">My credit score is</label>
<select id="selectBox1">
<option value="excellent">Excellent (720 - 850) </option>
<option value="good">Good (690 - 719)</option>
<option value="average">Average (630 - 689)</option>
<option value="poor">Poor (350 - 629)</option>
</select>
</td>
<td style="font-style:nunito; background-color:#FFEBF6;border:none;">
<label style="font-size:20px; padding-bottom:10px;">I care most about</label>
<select id="selectBox2">
<option value="a">Cash Back</option>
<option value="b">Rewards</option>
<option value="c">Travel</option>
<option value="d">Balance Transfer</option>
<option value="e">Low Interest</option>
<option value="f">Building My Credit</option>
</select>
</td>
<td style="font-style:nunito; background-color:#FFEBF6;border:none;"><br/>
<input id="click" onclick="Redirect()" type="button" value="Find Cards" style="width:200px; height:45px; margin-top:5px;background-color: #2832C2;border:#415BA4;color:#ffffff; font-weight:bold;"/>
</td>
</tr>
</table>
The Find Cards button is not clickable. What is wrong with this code?

onclick of button this function will opens multiple pages
function Redirect() {
window.open('url here', '_blank');
window.open('url here', '_blank');
}

for this you have to make code with condition statement and when 2 value combination match it will open your desire url
try out this code
function Redirect(e) {
e.preventDefault()
var value1 =$('#selectBox1').val();
var value2 = $('#selectBox2').val();
if(value1 == "your value" && value2 == "your value"){
window.open('your url', '_blank');
}
// repeate this if with your all combination of your value and chage url
}

javascript shows all associated DIVs on a dropdown box select

I am new to javascript and must have looked at almost all of the previous questions here and elsewhere related to this question and none seem to do the trick because they use asp, php, Ajax etc.
I use jQuery code for several other items on the page and have found that their css can cause issues with my pages and am not keen on using it either.
In my case, is there a way to select a country from a drop down box and then display a dropdown box with the states or provinces for that country. My code is shown below but when I run it, it shows all DIVs and not just the DIV that applies to the country selected. If a country has no states/province it will display nothing but passes a value of 0.
I'd like to know what is wrong with this code.
Second question is, the page starts with a default country and its states/provinces but since I use onChange on the country select, the javascript would not be triggered because initially there is no change. Regardless, even when I do change the country from its default, all DIVs are displayed anyway.
Is it possible to show the states/provinces for the default country and still use javascript for any change made to the default selection. It does not show this in the sample below, but the values for the countries and the associated states/provinces come from a database and can therefore not be incorporated in the javascript.
Any help or suggestions will be greatly appreciated.
<TABLE>
<TR><TD>Country</DIV></TD>
<TD><SELECT NAME="countryid" onChange="showstate(this.options[this.selectedIndex].value)">
<OPTION VALUE="NONE">Select a country</OPTION>
<OPTION VALUE="CA" SELECTED>Canada</OPTION>
<OPTION VALUE="US">United States</OPTION>
<OPTION VALUE="ES">Spain</OPTION>
</SELECT></TD>
</TR>
<script>
function showstate(country) {
if (country == "CA") {
hiddenDivUS.style.display='none';
hiddenDivNONE.style.display='none';
hiddenDivCA.style.display='block';
}
else {
if (country == "US") {
hiddenDivCA.style.display='none';
hiddenDivNONE.style.display='none';
hiddenDivUS.style.display='block';
}
else {
hiddenDivCA.style.display='none';
hiddenDivUS.style.display='none';
hiddenDivNONE.style.display='block';
}
}
</script>
<DIV ID="hiddenDivNONE" STYLE="display:none">
<TR><TD><DIV CLASS="inputlabel">Prov/State</DIV></TD>
<TD><INPUT TYPE="hidden" NAME="provid" VALUE="0"></TD>
</TR>
</DIV>
<DIV ID="hiddenDivCA" STYLE="display:none">
<TR><TD><DIV CLASS="inputlabel">Prov/State</DIV></TD>
<TD><SELECT NAME="provid">
<OPTION VALUE="101">British Columbia</OPTION>
.......
<OPTION VALUE="165">Yukon Territories</OPTION>
</SELECT></TD>
</TR>
</DIV>
<DIV ID="hiddenDivUS" STYLE="display:none">
<TR><TD><DIV CLASS="inputlabel">Prov/State</DIV></TD>
<TD><SELECT NAME="provid">
<OPTION VALUE="201">Alaska</OPTION>
.......
<OPTION VALUE="265">Wyoming</OPTION>
</SELECT></TD>
</TR>
</DIV>
</TABLE>
Instead of listing the proper DIV it shows all three of them

First off, careful with your capitals.
Secondly try to keep all js at the bottom of the page.
This code is using ES6 so you might wanna check if it will work in all browsers but you can see whats going on.
el.classList is supported by most browsers however add,remove and toggle are not (were not.. not sure now)
I have used some regex to grab all elements using the id state_ so we can hide them, then we target the exact one to make it visible, you can probably clean that up also.
<style>
.hidden {
display: none;
}
</style>
<select name="countryid" onChange="showState(event)">
<option value="">Select a country</option>
<option value="ca">Canada</option>
<option value="us">United States</option>
<option value="es">Spain</option>
</select>
<div id="state_ca" class="hidden">
This is hidden unless Canada is selected.
</div>
<div id="state_us" class="hidden">
This is hidden unless America is selected.
</div>
<script>
function showState(event) {
const countryCode = event.target.value;
const states = document.querySelectorAll('[id^=state_]');
const el = document.getElementById(`state_${countryCode}`);
states.forEach(el => {
if (el.classList.contains('hidden')) {
return;
}
el.classList.add('hidden');
});
if (el) {
el.classList.remove('hidden');
}
}
</script>

according to me this can be the answer to your problem. You can make a few changes in the code which I have not done.
function addStates() {
var selectCountry = document.getElementById("selectCountry").value;
console.log(selectCountry);
var selectState = document.getElementById("selectState");
if (selectCountry == "india") {
var option1 = document.createElement("option");
option1.value = "punjab";
option1.text = "Punjab";
selectState.add(option1);
var option2 = document.createElement("option");
option2.value = "karnataka";
option2.text = "Karnataka";
selectState.add(option2);
} else if (selectCountry == "usa") {
var option1 = document.createElement("option");
option1.value = "florida";
option1.text = "Florida";
selectState.add(option1);
var option2 = document.createElement("option");
option2.value = "california";
option2.text = "California";
selectState.add(option2);
}
}
<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<div>
<div>
<span>Select a country: </span>
</div>
<div>
<select onchange="addStates()" id="selectCountry">
<option value="" selected disabled>Please select a country</option>
<option value="india">India</option>
<option value="usa">USA</option>
</select>
</div>
</div>
<div>
<div>
<span>Please select a state: </span>
</div>
<div>
<select id="selectState">
</select>
</div>
</div>
</body>
</html>

I figured out how to get the desired result (see code below)
<!DOCTYPE HTML>
<HTML>
<HEAD>
<script>
function showStates(country)
{
if (country == "101")
{ document.getElementById('CAprov').style.display='block';
document.getElementById('Default').style.display='none';
document.getElementById('USstate').style.display='none';
document.getElementById('NoProv').style.display='none';
}
else if (country == "102")
{ document.getElementById('CAprov').style.display='none';
document.getElementById('Default').style.display='none';
document.getElementById('USstate').style.display='block';
document.getElementById('NoProv').style.display='none';
}
else
{ document.getElementById('CAprov').style.display='none';
document.getElementById('USstate').style.display='none';
document.getElementById('Default').style.display='none';
document.getElementById('NoProv').style.display='block';
}
return false;
}
</script>
</HEAD>
<BODY TOPMARGIN="0" LEFTMARGIN="0" MARGINHEIGHT="0" MARGINWIDTH="0" BORDER="0">
<FORM METHOD="post">
<TABLE>
<TR><TD>Country</TD>
<TD><SELECT NAME="country" id="country" onChange="showStates(this.options[this.selectedIndex].value);">
<OPTION VALUE="101" SELECTED>Canada</OPTION>
<OPTION VALUE="102">United States</OPTION>
<OPTION VALUE="314">Germany</OPTION>
</SELECT></TD></TR>
<TR ID="Default" STYLE="display: block;"><TD>Province</TD>
<TD><SELECT NAME="provid">
<OPTION VALUE="0">Select province</OPTION>
<OPTION VALUE="139">Newfoundland/Labrador</OPTION>
<OPTION VALUE="143">Nova Scotia</OPTION>
<OPTION VALUE="134">New Brunswick</OPTION>
<OPTION VALUE="149">Prince Edward Island</OPTION>
</SELECT></TD></TR>
<TR ID="CAprov" STYLE="display: none;"><TD>Province</TD>
<TD><SELECT NAME="provid">
<OPTION VALUE="0">Select province</OPTION>
<OPTION VALUE="139">Newfoundland/Labrador</OPTION>
<OPTION VALUE="143">Nova Scotia</OPTION>
<OPTION VALUE="134">New Brunswick</OPTION>
<OPTION VALUE="149">Prince Edward Island</OPTION>
</SELECT></TD></TR>
<TR ID="USstate" STYLE="display: none;"><TD>State</TD>
<TD><SELECT NAME="provid">
<OPTION VALUE="0">Select state</OPTION>
<OPTION VALUE="102">Alabama</OPTION>
<OPTION VALUE="105">Arizona</OPTION>
<OPTION VALUE="106">Arkansas</OPTION>
<OPTION VALUE="108">California</OPTION>
</SELECT></TD></TR>
<TR ID="NoProv" STYLE="display: none;"><TD>Prov/State</TD>
<TD><INPUT TYPE="hidden" NAME="provid" VALUE="0"> </TD></TR>
</TABLE>
</FORM>
</BODY>
</HTML>

How do I make all values in html select element selected using Javascript

In Html have two select tags, the first contains all the worlds countries, the second contains only the countries selected by user.
<form action="/fixsongs.fix">
<table>
<tr>
<td colspan="2">
<label title="Potential Releases from these countries get their score boosted">
Preferred Release Countries
</label>
</td>
</tr>
<tr>
<td>
<select id="preferred_countries_all" size="15" style="width:200px" multiple="multiple">
<option value=" AF">Afghanistan</option><option value="AX">Åland Islands</option><option value="AL">Albania</option><option value="DZ">Algeria</option><option value="AS">American Samoa</option><option value="AD">Andorra</option><option value="AO">Angola</option><option value="AI">Anguilla</option><option value="AQ">Antarctica</option><option value="AG">Antigua and Barbuda</option><option value="AR">Argentina</option><option value="AM">Armenia</option><option value="AW">Aruba</option><option value="AU">Australia</option><option value="AT">Austria</option><option value="AZ">Azerbaijan</option><option value="BS">Bahamas</option><option value="BH">Bahrain</option>...<option value="ZW">Zimbabwe</option>
</select>
</td>
<td>
<button style="width:100px" type="button" id="preferred_countries_add" onclick="add_preferred_countries();">
Add
</button>
<br>
<button style="width:100px" type="button" id="preferred_countries_remove" onclick="remove_preferred_countries();">
Remove
</button>
</td>
<td>
<select id="preferred_countries_selected" name="preferred_countries_selected" size="15" style="width:200px" multiple="multiple">
<option value="GB">United Kingdom</option>
</select>
</td>
</tr>
</table>
<input type="submit" value="Start">
The user selects them by highlighting and then click on button which invokes the following Javascript function.
function add_preferred_countries() {
allCountries = document.getElementById('preferred_countries_all');
selectedCountries = document.getElementById('preferred_countries_selected');
var length=$('#preferred_countries_all option:selected').length;
if(length==0) {
return false;
}
$('#preferred_countries_all option:selected').each(function(){
$('#preferred_countries_selected').append($(this));
});
//selectedCountries.value = "";
for (var i = 0; i < selectedCountries.options.length; i++) {
selectedCountries.options[i].selected = selected;
}
}
'
That bits works fine, but I have realized that when I finally submit the form containing this and various other options that it will send items in the select list that are actually selected. So in the absence of a better solution I want to automatically select all values in the preferred_countries_selected whenever user adds new countries, so that when user submits form the preferred countries will be sent to server
I thought this would work, but has no effect
for (var i = 0; i < selectedCountries.options.length; i++) {
selectedCountries.options[i].selected = selected;
I know the existing function has some JQuery in it, but I would prefer pure javascript solution as I don't really understand JQuery syntax.
Ideally I would prefer to do this just as they press submit, but that is another question.

You have some HTML validation issues with your table and you really should not use inline CSS or HTML event attributes (i.e. onclick) as they have many harmful side-effects.
See the inline comments in the code snippet below and note that you need the checked CSS pseudo-class, rather than selected:
// Get references to the two lists
var allCountries = document.getElementById('preferred_countries_all');
var selectedCountries = document.getElementById('preferred_countries_selected');
function add_preferred_countries(operation) {
if(operation === "add"){
// Get the selected countries from list one into an array
var allPreferredSelected = Array.prototype.slice.call(allCountries.querySelectorAll('option:checked'));
// Loop over the array
allPreferredSelected.forEach(function(selOption){
selectedCountries.appendChild(selOption); // Add each to the second list
});
// Loop through the second list and select each option
Array.prototype.slice.call(selectedCountries.querySelectorAll("option")).forEach(function(opt){
opt.selected = "selected";
});
console.log("Item added");
} else {
// Do remove operation here
// Loop over the selected countries in the second list
Array.prototype.slice.call(selectedCountries.querySelectorAll("option:checked")).forEach(function(opt){
selectedCountries.removeChild(opt); // Remove country
});
console.log("Item removed");
}
}
// Get the add and remove buttons into an array and loop over the array
Array.prototype.slice.call(document.querySelectorAll("button[id^='preferred_countries']")).forEach(function(btn){
// Set up a click event handler for the button
btn.addEventListener("click", function(){
add_preferred_countries(this.dataset.action); // Call the add/remove function with the right arg
});
});
/* Do your styling separate from the HTML */
button[id^='preferred_countries'] { width:100px; }
select { width:200px; height:20em; }
<form action="/fixsongs.fix">
<table>
<tr>
<td colspan="2">
<span title="Potential Releases from these countries get their score boosted">
Preferred Release Countries
</span>
</td>
</tr>
<tr>
<td>
<select id="preferred_countries_all" multiple="multiple">
<option value=" AF">Afghanistan</option>
<option value="AX">Åland Islands</option>
<option value="AL">Albania</option>
<option value="DZ">Algeria</option>
<option value="AS">American Samoa</option>
<option value="AD">Andorra</option>
<option value="AO">Angola</option>
<option value="AI">Anguilla</option>
<option value="AQ">Antarctica</option>
<option value="AG">Antigua and Barbuda</option>
<option value="AR">Argentina</option><option value="AM">Armenia</option>
<option value="AW">Aruba</option>
<option value="AU">Australia</option>
<option value="AT">Austria</option>
<option value="AZ">Azerbaijan</option>
<option value="BS">Bahamas</option><option value="BH">Bahrain</option>
...
<option value="ZW">Zimbabwe</option>
</select>
</td>
<td>
<button type="button" id="preferred_countries_add" data-action="add">Add</button>
<br>
<button type="button" id="preferred_countries_remove" data-action="remove">Remove</button>
</td>
<td>
<select id="preferred_countries_selected" name="preferred_countries_selected" multiple="multiple">
<option value="GB">United Kingdom</option>
</select>
</td>
</tr>
</table>
<input type="submit" value="Start">
</form>

Dropdown box - onchange and onselect

I want help, i am very new to html..
On selecting option from dropdown menu, I want html to put the values in word..
e.g. When I select "1" from drop down, it must show "one"
When I select "2' from drop down, it must show "two"
How to do that??
<HTML>
<Table border=10>
<TR>
<TD>Select Number</TD>
<TD><Select>
<option>1</option>
<option>2</option>
<option>3</option>
</Select></TD>
</TR>
<tr>
<td>In Words</td>
<td><input type="text" readonly></td>
</tr>
</Table>
</HTML>
Please make a script and show me...

A non-jQuery solution:
Firstly, give your select- and input-tags id's, and your options values (value=""). Then add a onchange=""-listener in the select-tag and make a function that carries out what you want to do (i.e. checking the selected value and displaying it in your input field), like so:
function showValue() {
var x = document.getElementById("mySelect").value;
document.getElementById("mySelection").value = "You selected: " + x;
}
<Table border=10>
<tr>
<td>Select Number</td>
<td><Select onchange="showValue()" id="mySelect">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</Select></td>
</tr>
<tr>
<td>In Words</td>
<td><input type="text" id="mySelection"></td>
</tr>
</Table>

If I understand what you want, you'll need some javascript to find what you selected, and take that 'string' and shove it in an element for the user to see.
Here is a working example. Try making one these next time you ask a question. Welcome to Stack Overflow.
http://jsfiddle.net/sheriffderek/6vp5Lskn/
HTML
<select name='my_select' id='my_select'>
<option value='1'>Option 1</option>
<option value='2'>Option 2</option>
<option value='3'>Option 3</option>
<option value='4'>Option 4</option>
<option value='5'>Option 5</option>
</select>
<div id="outcome">
You have selected: <span></span>
</div>
javascript (jQuery)
var selectedOption; // define this variable
// when the select is changed...
$('#my_select').on('change', function() {
// get the option that was selected
selectedOption = $( "#my_select option:selected" ).text();
// put the option in the place you want it
$('#outcome span').html(selectedOption);
});

How to pass parameters on onChange of html select

I am a novice at JavaScript and jQuery. I want to show one combobox-A, which is an HTML <select> with its selected id and contents at the other place on onChange().
How can I pass the complete combobox with its select id, and how can I pass other parameters on fire of the onChange event?

function getComboA(selectObject) {
var value = selectObject.value;
console.log(value);
}
<select id="comboA" onchange="getComboA(this)">
<option value="">Select combo</option>
<option value="Value1">Text1</option>
<option value="Value2">Text2</option>
<option value="Value3">Text3</option>
</select>
The above example gets you the selected value of combo box on OnChange event.

Another approach wich can be handy in some situations, is passing the value of the selected <option /> directly to the function like this:
function myFunction(chosen) {
console.log(chosen);
}
<select onChange="myFunction(this.options[this.selectedIndex].value)">
<option value="1">Text 1</option>
<option value="2">Text 2</option>
</select>

For how to do it in jQuery:
<select id="yourid">
<option value="Value 1">Text 1</option>
<option value="Value 2">Text 2</option>
</select>
<script src="jquery.js"></script>
<script>
$('#yourid').change(function() {
alert('The option with value ' + $(this).val() + ' and text ' + $(this).text() + ' was selected.');
});
</script>
You should also know that Javascript and jQuery are not identical. jQuery is valid JavaScript code, but not all JavaScript is jQuery. You should look up the differences and make sure you are using the appropriate one.

JavaScript Solution
<select id="comboA">
<option value="">Select combo</option>
<option value="Value1">Text1</option>
<option value="Value2">Text2</option>
<option value="Value3">Text3</option>
</select>
<script>
document.getElementById("comboA").onchange = function(){
var value = document.getElementById("comboA").value;
};
</script>
or
<script>
document.getElementById("comboA").onchange = function(evt){
var value = evt.target.value;
};
</script>
or
<script>
document.getElementById("comboA").onchange = handleChange;
function handleChange(evt){
var value = evt.target.value;
};
</script>

I found #Piyush's answer helpful, and just to add to it, if you programatically create a select, then there is an important way to get this behavior that may not be obvious. Let's say you have a function and you create a new select:
var changeitem = function (sel) {
console.log(sel.selectedIndex);
}
var newSelect = document.createElement('select');
newSelect.id = 'newselect';
The normal behavior may be to say
newSelect.onchange = changeitem;
But this does not really allow you to specify that argument passed in, so instead you may do this:
newSelect.setAttribute('onchange', 'changeitem(this)');
And you are able to set the parameter. If you do it the first way, then the argument you'll get to your onchange function will be browser dependent. The second way seems to work cross-browser just fine.

jQuery solution
How do I get the text value of a selected option
Select elements typically have two values that you want to access.
First there's the value to be sent to the server, which is easy:
$( "#myselect" ).val();
// => 1
The second is the text value of the select.
For example, using the following select box:
<select id="myselect">
<option value="1">Mr</option>
<option value="2">Mrs</option>
<option value="3">Ms</option>
<option value="4">Dr</option>
<option value="5">Prof</option>
</select>
If you wanted to get the string "Mr" if the first option was selected (instead of just "1") you would do that in the following way:
$( "#myselect option:selected" ).text();
// => "Mr"
See also
.val() jQuery API Documentation

This is helped for me.
For select:
$('select_tags').on('change', function() {
alert( $(this).find(":selected").val() );
});
For radio/checkbox:
$('radio_tags').on('change', function() {
alert( $(this).find(":checked").val() );
});

You can try bellow code
<select onchange="myfunction($(this).val())" id="myId">
</select>

Html template:
<select class="staff-select">
<option value="">All</option>
<option value="196">Ivan</option>
<option value="195">Jon</option>
</select>
Js code:
const $staffSelect = document.querySelector('.staff-select')
$staffSelect.onchange = function () {
console.log(this.value)
}

Just in case someone is looking for a React solution without having to download addition dependancies you could write:
<select onChange={this.changed(this)}>
<option value="Apple">Apple</option>
<option value="Android">Android</option>
</select>
changed(){
return e => {
console.log(e.target.value)
}
}
Make sure to bind the changed() function in the constructor like:
this.changed = this.changed.bind(this);

this code once i write for just explain onChange event of select you can save this code as html and see output it works.and easy to understand for you.
<html>
<head>
<title>Register</title>
</head>
<body>
<script>
function show(){
var option = document.getElementById("category").value;
if(option == "Student")
{
document.getElementById("enroll1").style.display="block";
}
if(option == "Parents")
{
document.getElementById("enroll1").style.display="none";
}
if(option == "Guardians")
{
document.getElementById("enroll1").style.display="none";
}
}
</script>
<form action="#" method="post">
<table>
<tr>
<td><label>Name </label></td>
<td><input type="text" id="name" size=20 maxlength=20 value=""></td>
</tr>
<tr style="display:block;" id="enroll1">
<td><label>Enrollment No. </label></td>
<td><input type="number" id="enroll" style="display:block;" size=20 maxlength=12 value=""></td>
</tr>
<tr>
<td><label>Email </label></td>
<td><input type="email" id="emailadd" size=20 maxlength=25 value=""></td>
</tr>
<tr>
<td><label>Mobile No. </label></td>
<td><input type="number" id="mobile" size=20 maxlength=10 value=""></td>
</tr>
<tr>
<td><label>Address</label></td>
<td><textarea rows="2" cols="20"></textarea></td>
</tr>
<tr >
<td><label>Category</label></td>
<td><select id="category" onchange="show()"> <!--onchange show methos is call-->
<option value="Student">Student</option>
<option value="Parents">Parents</option>
<option value="Guardians">Guardians</option>
</select>
</td>
</tr>
</table><br/>
<input type="submit" value="Sign Up">
</form>
</body>
</html>

function setMyValue(v) {
console.log(v);
}
<select onchange="setMyValue(this.value)">
<option value="a">1</option>
<option value="b">2</option>
<option value="c">3</option>
</select>

This worked for me onchange = setLocation($(this).val())
Here.
#Html.DropDownList("Demo",
new SelectList(ViewBag.locs, "Value", "Text"),
new { Class = "ddlStyle", onchange = "setLocation($(this).val())" });

Simply:
function retrieve(){
alert(document.getElementById('SMS_recipient').options[document.getElementById('SMS_recipient').selectedIndex].text);
}
function retrieve_other() {
alert(myForm.SMS_recipient.options[document.getElementById('SMS_recipient').selectedIndex].text);
}
function retrieve() { alert(document.getElementById('SMS_recipient').options[document.getElementById('SMS_recipient').selectedIndex].text);
}
<HTML>
<BODY>
<p>RETRIEVING TEXT IN OPTION OF SELECT </p>
<form name="myForm" action="">
<P>Select:
<select id="SMS_recipient">
<options value='+15121234567'>Andrew</option>
<options value='+15121234568'>Klaus</option>
</select>
</p>
<p>
<!-- Note: Despite the script engine complaining about it the code works!-->
<input type="button" onclick="retrieve()" value="Try it" />
<input type="button" onclick="retrieve_other()" value="Try Form" />
</p>
</form>
</HTML>
</BODY>
Output:
Klaus or Andrew depending on what the selectedIndex is. If you are after the value just replace .text with value. However if it is just the value you are after (not the text in the option) then use document.getElementById('SMS_recipient').value

//html code
<select onchange="get(this)">
<option value="a">1</option>
<option value="b">2</option>
<option value="c">3</option>
</select>
//javscript code
function get(select) {
let value = select.value;
console.log(value);
}

We Keep Coding

JavaScript is the programming language of the Web.

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Two problems are there alert "hello"; should be alert("hello"); And there is } missing at the end of function. And I don't see closing of script tag also.

Well, if you'd bothered checking your browser's debug console, you'd have seen your syntax errors getting logged there: alert "hello"; should be alert("hello"); The debug console should be your FIRST stop anytime something on a web page isn't working.

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