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Detect Comma/Enter key press

There are some comma separated values in an input field. I want to alert a message when I am pressing the COMMA(,) or ENTER key. I have given the code that I used for this, but didn't work. Is there anything inefficient about this?
$(document).on("keyup", '.tagsinput', function (e) {
if (e.which == 13 || e.which == 44) {
alert('comma added');
}
});

The keycode (which in jQuery) for a comma is 188
There is a brilliant tool for this here

$(document).on("keyup", '.tagsinput', function (e) {
if (e.keyCode == 188) { // KeyCode For comma is 188
alert('comma added');
}
});
Demo: http://jsfiddle.net/tusharj/3yLwgwhb/

Try using keypress instead of keyup:
$(function() { //<-- you are missing this
$(document).on("keypress", '.tagsinput', function(e) { //<-- note, its keypress
console.log('key pressed ', e.which);
if (e.which == 13 || e.which == 44) {
return false; //<-- prevent
}
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<input type='text' class='tagsinput' />
<input type='text' class='tagsinput' />

Use event.key and modern JS!
No number codes anymore. You can check for Enter or , key directly.
const input = document.getElementById("inputId");
input.addEventListener("keypress", function (event) {
if (event.key === "Enter" || event.key === ",") {
// Do something
}
});
Mozilla Docs
Supported Browsers

You shouldn't listen for keyup, better way is to listen for keypress:
$('.tagsinput').keypress(function (e) {
if (e.which == 13 || e.which == 44) {
alert('comma added');
}
});
Jsfiddle here: http://jsfiddle.net/doe7qk6r/

$(document).ready(function(){
$("#tagsinput").bind('keypress', function(e) {
var code = e.keyCode || e.which;
if(code == 44) { // comma key code is 44
str= $('#tagsinput').val();
str.substring(0, str.length - 2);
arr = str.split(",");
key = arr[arr.length-1];
arr.splice(arr.length-1, 1);
if(arr.indexOf( key )!=-1){
alert("Duplicate detected : "+key);
//uncomment the next line to remove the duplicated word just after it detects !
//$('#tagsinput').val(arr);
}
}
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.0/jquery.min.js"></script>
<label>Sub Location Names</label>
<input name="tagsinput" id="tagsinput" class="tagsinput" data-maxwidth="200" id="ptag" value="" />
hope this will work for you :)

A default button to an entire webpage to respond to the ENTER key press

Is it possible to set a default button for the ENTER key press for an entire webpage?
I googled and I came across the below code. But I'm not sure of what this line means var keycode = (event.keyCode ? event.keyCode : (event.which ? event.which : event.charCode)); So I thought of posting this question here at stackoverflow.
Thanks.
<script language="javascript">
$(document).ready(function () {
$("input").bind("keydown", function (event) {
var keycode = (event.keyCode ? event.keyCode : (event.which ? event.which : event.charCode));
if (keycode == 13) {
document.getElementById('btn').click();
return false;
} else {
return true;
}
});
});
</script>

Different browsers/devices1 support different properties of obtaining key codes. The ternary expression is the same as:
var keyCode;
if(event.keyCode) // if keyCode is supported get that #top-priority
keyCode = event.keyCode;
else if(event.which) // else, if .which is supported, get that
keyCode = event.which;
else // alas! nothing above is supported
keyCode = event.charCode; // we should take charCode
1 Devices for example EAN barcode reader has a charCode of 13 Since its .keyCode is 0 (falsy), the 1st if condition is failed. Courtesy - MLeFevre

With JQuery (if an option) I would do
$(document).keyup(function(evt) {
if (evt.keyCode == 13) {
// do your thing
}
}
This worked for me in Chrome,FF, Safari and Opera.
Also consider using various checks as in #Gaurang Tandon's answer to cover all hardware specs.

Disable enter submit

I have a form with a textfield inside and I am trying to disable the default behavior when the browser submits the whole form if the user presses Enter while the textfield is selected.
$('#recaptcha_response_field').keydown(function(event) { if (event.keyCode == 13) {
event.preventDefault();
event.stopPropagation();
event.stopImmediatePropagation();
alert("You Press ENTER key");
return false;
}
});
Currently am getting "You Press ENTER key" and the default behavior isn't overridden.

Try this:
$(document).on("keypress", 'form', function (e) {
var code = e.keyCode || e.which;
if (code == 13) {
e.preventDefault();
return false;
}
});
This will prevent the form submit on keypress
DEMO HERE

I found this and it works for me.
<input type="text" name="somename" id="someid" value="" onkeypress="return event.keyCode!=13">

To prevent the script from blocking the enter key on other elements such as on a textarea. Change the target from "form" to "input".
$(document).on("keypress", "input", function (e) {
var code = e.keyCode || e.which;
if (code == 13) {
e.preventDefault();
return false;
}
});

If none of the above solution is working for you , and you are using javascript anyway , why don't you use button type as 'button' <input type='button'> and submit it using javascript
$('#form_id').submit();

U can use this script to prevent enter on entire from.
<script type="text/javascript">
$(document).on("keypress", 'form', function (e) {
if (e.target.className.indexOf("allowEnter") == -1) {
var code = e.keyCode || e.which;
if (code == 13) {
e.preventDefault();
return false;
}
}
});
</script>
you put the classname to which control need to use enter

jQuery not detecting enter key pressed in textarea

My setup: jQuery 1.6.2
I have this HTML
<textarea class="comment_box"> Write a comment...</textarea>
And the following Javascript
<script>
$('.comment_box').keydown(function (e){
if(e.keyCode == 13){
alert('you pressed enter ^_^');
}
})
</script>
When I press the enter key in the textarea, nothing triggers
EDIT Oops, cut and paste error, I do have $ in my code and it still doesn't work, must be something else going on.
My bad, it is a user operator error, it does work. Sorry for the confusion.

$('.comment_box').keypress(function(event) {
// Check the keyCode and if the user pressed Enter (code = 13)
if (event.keyCode == 13) {
alert('you pressed enter ^_^');
}
});
Thats it

Check out this answer:
jQuery Event Keypress: Which key was pressed?
var code = (e.keyCode ? e.keyCode : e.which);
if(code == 13) { //Enter keycode
//Do something
}

For jQuery you need to use the $ to specify.
$('.comment_box').keyd
should do it.

How do i call a js function on pressing enter key

I'd like to know how I can initiate a javacsript function when pressing the enter key. I'm trying to create a function called handleEnter(event, fn).
I want to use the function on an input field eg:
onkeypress="return handleEnter(event, update_field(this));

For your function called onkeypress, check the event's .keyCode or .which value, and see if it is equal to 13.
function handleEnter(e, func){
if (e.keyCode == 13 || e.which == 13)
//Enter was pressed, handle it here
}
IIRC, IE uses event.which, and Firefox will use e.keyCode to see which key was pressed.

I think I've solved it.
On the input field I've got:
<input onkeypress="return handleEnter(event, update_field, this, 'task');" type="text" />
For my function I've got:
function handleEnter(e, callback, obj, field){
if(e){
e = e
} else {
e = window.event
}
if(e.which){
var keycode = e.which
} else {
var keycode = e.keyCode
}
if(keycode == 13) {
var tstid = $(obj).parent().find('input[type=hidden]').val();
callback.apply(this, [field, $(obj).val(), tstid ]);
}
}
and it seems to be working fine now.

You can try this shorthand
<input type=”text” onKeydown=”Javascript: if (event.keyCode==13) Search();”>
<input type=”button” value=”Search” onClick=”Search();”>
From http://www.techtamasha.com/call-javascript-function-on-pressing-enter-key/25