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Trigger Button Click on Enter in HTML

I have researched this through Stack, W3, and others but the solutions that I fiond there don't work. Below is part of my html code, I did my best to try and keep it neat (not an expert by any means).
<select name="ctl00$ContentPlaceHolder1$ddlSearchCriteria" id="ctl00_ContentPlaceHolder1_ddlSearchCriteria" style="width:150px;">
<option value="LastName">Last Name</option>
<option value="FirstName">First Name</option>
<option value="Phone">Phone Number</option>
<option value="Department">Department</option>
<option value="Division">Division</option>
<option value="Location">Location</option>
<option value="Title">Title</option>
<option value="Email">Email Address</option>
<option value="Keywords">Keywords</option>
</select>
<div style="height:10px"></div>
<input name="ctl00$ContentPlaceHolder1$txtSearchString" type="text" id="ctl00_ContentPlaceHolder1_txtSearchString" style="width:160px;">
<button type="button" name="ctl00$ContentPlaceHolder1$Button1" id="ctl00_ContentPlaceHolder1_Button1" style="position: absolute; height:22px; " onclick="myFunction()">Go</button>
<div style="height:5px;"></div>
</td>
<td style="width:48%; height: 27px;"> </td>
</tr>
</tbody>
</table>
</div>
<script>
var GoToURL = 'http://bccportal01/webapps/agency/epdsearch/Search.aspx?op=' + dropDownChoice + '&str=' + inputText;
function myFunction()
{
var dropDownChoice = document.getElementById("ctl00_ContentPlaceHolder1_ddlSearchCriteria").value;
var inputText = document.getElementById("ctl00_ContentPlaceHolder1_txtSearchString").value;
var GoToURL = 'http://bccportal01/webapps/agency/epdsearch/Search.aspx?op=' + dropDownChoice + '&str=' + inputText;
window.open(GoToURL);
}
</script>
I'm trying to make it so that when you click enter the submit button activates. I have tried https://www.w3schools.com/howto/howto_js_trigger_button_enter.asp and Trigger function on Enter keypress as examples.
But this isn't working, all it does is break my code. Not sure if I'm putting it in the wrong spot. I added it right below var inputText in the Function.

You need to add keyup event listener on the input textfield
Add this to your javascript
var input = document.getElementById("ctl00_ContentPlaceHolder1_txtSearchString");
input.addEventListener("keyup", function(event) {
event.preventDefault();
if (event.keyCode === 13) {
document.getElementById("ctl00_ContentPlaceHolder1_Button1").click();
}
});
Working Example

Replace type="button" with type="submit"
Add a <form onsubmit="myFunction">
Wrap your <select> with the <form>:
<form onsubmit="myFunction">
<select>...</select>
</form>
Here's what your function should do to prevent the form from submitting (we didn't include an "action" so it will submit to itself)
function myFunction(event){
// Stop the form from submitting (default functionality)
event.preventDefault();
...
}
Your code should look similar to this (added a fix for obtaining the select list value the proper way)
<form onsubmit="myFunction">
<select id="mySelect">
<option value="LastName">Last Name</option>
<option value="FirstName">First Name</option>
<option value="Phone">Phone Number</option>
<option value="Department">Department</option>
<option value="Division">Division</option>
<option value="Location">Location</option>
<option value="Title">Title</option>
<option value="Email">Email Address</option>
<option value="Keywords">Keywords</option>
</select>
<input type="text" id="myInput">
</form>
<script type="text/javascript">
function myFunction(event){
// Prevent the form from submitting (default functionality)
event.preventDefault();
var myUrl = "http://bccportal01/webapps/agency/epdsearch/Search.aspx?",
selectEl = document.getElementById('mySelect'),
inputEl = document.getElementById('myInput');
// Append the selected value
myUrl += "op=" + selectEl.options[selectEl.selectedIndex].value;
myUrl += "&str=" + inputEl.value;
window.open(myURL);
}
</script>

Html/Javascript form calculation and validation in new page

I'm working on a website project and really need help as I'm new to all this. I'm basically given values to every option in the drop down menu's and make them add together which I've managed. But then I want to the total value from the menus to then be the range for a pseudo random to be a generated and added to the age I input.
When I hit submit I'd like it to calculate all that and display the result on a new page. I want to be able to do all this within javascript and html.
Any help would be greatly appreciated! My coding is below. Thanks so much!
<body>
<form id="form1" action="" method="post" onsubmit="return calcTotal(this)">
<select name=select1>
<option selected="selected" value="0">Chinese Zodiac</option>
<option value="3">Rat</option>
<option value="3">Ox</option>
<option value="4">Tiger</option>
<option value="2">Rabbit</option>
<option value="4">Dragon</option>
<option value="5">Snake</option>
<option value="3">Horse</option>
<option value="3">Sheep</option>
<option value="4">Monkey</option>
<option value="5">Rooster</option>
<option value="3">Dog</option>
<option value="3">Pig</option>
</select>
</select>
<br />
<select name=select2>
<option selected="selected" value="0">Star Sign</option>
<option value="2">Aries</option>
<option value="4">Taurus</option>
<option value="3">Gemini</option>
<option value="4">Cancer</option>
<option value="3">Leo</option>
<option value="2">Virgo</option>
<option value="2">Libra</option>
<option value="3">Scorpio</option>
<option value="2">Sagittarius</option>
<option value="4">Capricorn</option>
<option value="2">Aquarius</option>
<option value="3">Pisces</option>
</select>
<br />
<select name=select3>
<option selected="selected" value="0">Blood Type</option>
<option value="3">O</option>
<option value="2">A</option>
<option value="1">B</option>
<option value="3">AB</option>
</select>
<br />
<select name=select4>
<option selected="selected" value="0">Favourite Colour</option>
<option value="3">Black</option>
<option value="3">Blue</option>
<option value="2">Brown</option>
<option value="2">Green</option>
<option value="3">Orange</option>
<option value="3">Pink</option>
<option value="2">Purple</option>
<option value="4">Red</option>
<option value="2">Yellow</option>
<option value="2">White</option>
<option value="5">Other</option>
</select>
<br />
Age<input name="" type="number" value="" />
<br />
<input name="" type="submit" value="Total" />
<span>Total: </span><span id="result"></span>
</form>
<script type="text/javascript">
function calcTotal(oForm){
var sum = 0;
for(i=0; i < oSels.length; i++){
sum += new Number(oSels[i].value);
}
document.getElementById('result').innerHTML = sum;
return false;
}
window.onload=function(){
oSels = document.getElementById('form1').getElementsByTagName('select');
for(i=0; i < oSels.length; i++){
oSels[i].onchange=function(){
document.getElementById('result').innerHTML = '';
}
}
}
</script>

I played with your code. I don't now if it's someting like that that you wanted but here is an example of random score.
It now use the age to generate a value.
Take a look if you like it at my codepen.
I changed the age input:
Age<input id="age" name="" type="number" value="" />
I also added a new function to generate random number between min-max:
function getRandomInt (min, max) {
return Math.floor(Math.random() * (max - min + 1)) + min;
}
And modified how the sum is calculated:
var age = document.getElementById('age').value;
sum = parseInt(age) + parseInt(getRandomInt(sum-(age / 4),sum+(age / 4)));
//Add some random. The more you are older, the more random it is.
You can do a lot of different generated sum. If you want less modifications, we also can take the last digit of the age to get the min/max value generated...
Edit:
To help you share variables between pages, Look at this question.

Adding this as an answer as the submitter considers it a good idea:
Put the result from all your maths into hidden fields. Then when you submit the form, the values will be passed along.
You don't need to do anything special really. Just add fields like this:
<input type="hidden" value="[yourValue]" name="fieldName" id="fieldId" />
For the yourValue part, simply insert your caclulated value from the JavaScript:
document.getElementById("fieldId").value = calculatedValue;
Since it's all part of the same form that you're submitting anyway, they will all be past along. You can retrieve the fields on the receiving page as normal.
I downloaded and edited your entire code block. I changed a couple of things.
1. You don't need the onsubmit on your form. You need a call the JavaScript function on a Total button. The submit button is added to submit the form when the user is done.
2. A hidden field to hold your result is added to the form.
3. The function where you do your calculation has an addition to send the calulated total to the new hidden field.
4. You need to add something to the ACTION, so it knows where to submit the form. You can also remove the ALERT. I just added that to be sure it worked right.
I've run and tested this, and it works exactly as expected. This is what the edited code looks like:
<body>
<form id="form1" action="" method="post">
<select name=select1>
<option selected="selected" value="0">Chinese Zodiac</option>
<option value="3">Rat</option>
<option value="3">Ox</option>
<option value="4">Tiger</option>
<option value="2">Rabbit</option>
<option value="4">Dragon</option>
<option value="5">Snake</option>
<option value="3">Horse</option>
<option value="3">Sheep</option>
<option value="4">Monkey</option>
<option value="5">Rooster</option>
<option value="3">Dog</option>
<option value="3">Pig</option>
</select>
</select>
<br />
<select name=select2>
<option selected="selected" value="0">Star Sign</option>
<option value="2">Aries</option>
<option value="4">Taurus</option>
<option value="3">Gemini</option>
<option value="4">Cancer</option>
<option value="3">Leo</option>
<option value="2">Virgo</option>
<option value="2">Libra</option>
<option value="3">Scorpio</option>
<option value="2">Sagittarius</option>
<option value="4">Capricorn</option>
<option value="2">Aquarius</option>
<option value="3">Pisces</option>
</select>
<br />
<select name=select3>
<option selected="selected" value="0">Blood Type</option>
<option value="3">O</option>
<option value="2">A</option>
<option value="1">B</option>
<option value="3">AB</option>
</select>
<br />
<select name=select4>
<option selected="selected" value="0">Favourite Colour</option>
<option value="3">Black</option>
<option value="3">Blue</option>
<option value="2">Brown</option>
<option value="2">Green</option>
<option value="3">Orange</option>
<option value="3">Pink</option>
<option value="2">Purple</option>
<option value="4">Red</option>
<option value="2">Yellow</option>
<option value="2">White</option>
<option value="5">Other</option>
</select>
<br />
Age<input name="" type="number" value="" />
<br />
<input name="" type="button" value="Total" onclick="calcTotal();" />
<input name="submit" type="submit" value="Submit" />
<span>Total: </span><span id="result"></span>
<input type="hidden" value="0" name="resultIs" id="resultIs" />
</form>
<script type="text/javascript">
function calcTotal(oForm) {
var sum = 0;
for (i = 0; i < oSels.length; i++) {
sum += new Number(oSels[i].value);
}
//This is what you are using to display the result to your user.
document.getElementById('result').innerHTML = sum;
//This will add the value of the result to a hidden field I added to the form. When you submit it, just request the value of "resultIs"
document.getElementById("resultIs").value = sum;
alert(sum);
return false;
}
//I really don't even see that this is needed. Your form doesn't need to be cleared onLoad.
window.onload = function() {
oSels = document.getElementById('form1').getElementsByTagName('select');
for (i = 0; i < oSels.length; i++) {
oSels[i].onchange = function() {
document.getElementById('result').innerHTML = '';
}
}
}
</script>

Combine form input value with selected option

I want to combine values from option and input fields in realtime by using jQuery.
<input name="recipe" id="recipe" value="tablespoons" />
<select id="spoon_value" name="spoon_value">
<option value="1" selected="">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>
Maybe something like this would work, but I'm getting error.
Uncaught SyntaxError: Unexpected identifier
$('select#spoon_value').each(function(i) {
$(select[name=spoon_value] option[value=" + this.data.spoon_value + "]").html() + this.data.recipe);
The output I want is 2tablespoons or 3tablespoons and so on.

<!doctype>
<html>
<head>
<script>
function _(x){
return document.getElementById(x);
}
function update() {
var tbsVal = _("spoon_value").value;
var output = tbsVal + " tablespoons";
_("realtimeTbsVal").innerHTML = output;
}
</script>
</head>
<body>
<form action="yourFileName" method="post">
<select id="spoon_value" name="spoon_value" onblur="update()">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>
<input type="submit" value="Submit">
</form>
<div id="realtimeTbsVal">yo</div>
</body>
</html>

You're missing quotes around your selector inside your each function -- you also have an each function targeting an ID, which is bad because it most likely means you're repeating ID's. Here's a syntax correct version of your code:
$('select#spoon_value').each(function(i) {
var someData = $("select[name=spoon_value] option[value=" + this.data.spoon_value + "]").html() + this.data.recipe;
});

selected value from select box in javascript

I want to get the value of the select box using javascript i have the following code.
html part
<select name="marked" id="marked" onchange="checkdata(this); ">
<option value="">SELECT</option>
<option value="all">ALL</option>
<option value="none">NONE</option>
<option value="read">READ</option>
<option value="unread">UNREAD</option>
</select>
script
<script type="text/javascript">
function checkdata()
{
for(var i=0; i < document.myform.message.length; i++)
{
document.myform.message[i].checked=true;
}
}
</script>
i tried the code
var all = document.myform.marked.options[document.myform.selectedIndex].value;
alert(all);
no alert is coming
i also tried
var all= document.getElementById('marked').value;
alert(all);
alert is coming but the value for every selection in "1"

You missed the '.marked':
var all = document.myform.marked.options[document.myform.marked.selectedIndex].value;
alert(all);

var e = document.getElementById("ctl00_cphContent_ddlVoteType");
var strOption = e.options[e.selectedIndex].value;
working fine for me. please check

Try
<form method="POST" name="me">
<select size="1" name="D1" onChange="checkData()">
<option value="99">Default</option>
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
</select><input type="submit" value="Submit" name="B1"><input type="reset" value="Reset" name="B2"></p>
</form>
<script Language="JavaScript"><!--
function checkData()
{
var myTest =
me.D1.options[me.D1.options.selectedIndex].value;
///or me.D1.options[me.D1.selectedIndex].value
alert(myTest);
}
</script>

the following code is working for me
Java Script :
function checkdata()
{
alert(document.getElementById('marked').value);
}
HTML :
<select name="marked" id="marked" onchange="checkdata(this);">
<option value="">SELECT</option>
<option value="all">ALL</option>
<option value="none">NONE</option>
<option value="read">READ</option>
<option value="unread">UNREAD</option>
</select>

get the selected value onchange
<script Language="JavaScript">
function checkdata(marked){
var marked_value = marked.value; // store the selected value marked_value
alert(marked_value); // do further processing with "marked_value" if needed
}
</script>
for option selects you don't use "checked" that is for radio and checkbox

update dropdown menu values depending on user selection

I have the following html:
<label>Sizes
<select name="item_options[product_size]">
<option value="s">small <span class="avail-inventory">10</span></option>
<option value="m">medium <span class="avail-inventory">1</span></option>
<option value="l">large <span class="avail-inventory">5</span></option>
<option value="xl">extra large <span class="avail-inventory">10</span></option>
</select>
</label>
<label>Quantity
<select name="quantity">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
<option value="6">6</option>
<option value="7">7</option>
<option value="8">8</option>
<option value="9">9</option>
</select>
</label>
This is part of a shopping cart where the user can pick product option(size) and quantity. Since the quantity always varies, I would like the max quantity change on the fly depending on what product option the user chooses.
For instance if the user chooses size large the max number in quantity dropdown should also be only 5.
thanks a lot

Keep and object of your size quantities and update the select accordingly. Alternatively you could put both the size and quantity as a value of the select and then process the string e.g value="s|10" and then split the string, or use the data attribute of the html (or some other attribute)... Anyhow I think this is the best option below:
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.6.1/jquery.min.js" type="text/javascript"></script>
<script>
sizes = {"m": 5, "s": 10, "l":2, "xl": 50}
$(function(){
$("#sizes").change(function(){
index = $(this).val();
var html = '<select name="quantity">';
for (var i=0;i<sizes[index];i++){
html += "<option value=" + (i + 1) +">" + (i+1) + "</option>";
}
html +="</select>"
$("#quantity").html(html);
})
})
</script>
</head>
<body>
<label>Sizes
<select id="sizes" name="item_options[product_size]">
<option value="s">small <span class="avail-inventory">5</span></option>
<option value="m">medium <span class="avail-inventory">10</span></option>
<option value="l">large <span class="avail-inventory">2</span></option>
<option value="xl">extra large <span class="avail-inventory">50</span></option>
</select>
</label>
<br>
<label>Quantity</label>
<span id="quantity">
Please select size first
</span>
</body>
</html>
EDIT
if you want to have a dropdown displayed here is how to do it:
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.6.1/jquery.min.js" type="text/javascript"></script>
<script>
sizes = {"m": 5, "s": 10, "l":2, "xl": 50}
$(function(){
$("#sizes").change(function(){
index = $(this).val();
console.log(sizes[index])
var html = '';
for (var i=0;i<sizes[index];i++){
html += "<option value=" + (i + 1) +">" + (i+1) + "</option>";
}
$("#quantity").html(html);
$("#quantity").removeAttr("disabled");
})
})
</script>
</head>
<body>
<label>Sizes
<select id="sizes" name="item_options[product_size]">
<option value="s">small <span class="avail-inventory">5</span></option>
<option value="m">medium <span class="avail-inventory">10</span></option>
<option value="l">large <span class="avail-inventory">2</span></option>
<option value="xl">extra large <span class="avail-inventory">50</span></option>
</select>
</label>
<br>
<label>Quantity</label>
<select id="quantity" disabled=true>
<option>Please select size first</option></select>
</body>
</html>

After some research it appears you can't get the text() or html() from any tags in an <option>. I changed the text inside the options a bit so that I could retrieve the value from the Option tag as a string and just did a split.
http://jsfiddle.net/kasdega/hqLPp/
<option value="s">small - 10</option>
$(document).ready(function(){
$("#productSize").change(function(){
var me = $(this);
var avail = me.find("option:selected").html().split("-")[1].trim();
$("#quantity option").each(function() {
$(this).remove();
});
for(var i=1; i<= avail; i++) {
$("#quantity").append("<option>"+i+"</option>");
}
});
});