Develop Reference

How do I combine the on click event & the keydown of the enterkey?

I have a small quiz and am trying to get it so that after a user enters their answer, they can click submit button or press the enter key on their keyboard. I have tried using a callback function to capture both instances.
<form>
<input id="answer"></input>
<button id="btn" class="submit">SUBMIT</button>
</form>
var callback = function() {
var myAnswer = document.getElementById('answer').value;
if (myAnswer == "y" || myAnswer == "Y" ) {
$('.content-bd').html("<p>Well done!<p>");
}
else {
$('.content-bd').html("<p>Try again<p>");
}
};
$("input").keypress(function() {
if (event.which == 13) callback();
});
$('#btn').click(callback);

You are missing to collect the event.
$("input").keypress(function(event) {
if (event.which == 13) callback();
});

There are at least four problems:
The default type of a button is submit, so clicking that button will submit the form (and refresh the page). If you don't want that, add type="button" to the button.
input tags are void tags, you never write </input>
As AjAX. says, you've forgotten to declare the event parameter in your keypress callback, so you're relying on the global event, which doesn't exist on Firefox. (It would work on Chrome or IE.)
Some browsers submit the form if it has a single input and the user presses Enter. If you don't want that to happen, prevent form submission.
So:
var callback = function() {
var myAnswer = document.getElementById('answer').value;
if (myAnswer == "y" || myAnswer == "Y" ) {
$('.content-bd').html("<p>Well done!<p>");
}
else {
$('.content-bd').html("<p>Try again<p>");
}
};
$("input").keypress(function(event) {
if (event.which == 13) callback();
});
$('#btn').click(callback);
$("form").submit(false);
<form>
<input id="answer" type="text">
<button type="button" id="btn" class="submit">SUBMIT</button>
</form>
<div class="content-bd"></div>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

Its keydown function not keypress along with passing event.
<input type="text" id="txt"/>
$('#txt').keydown(function (e){
if(e.keyCode == 13){
alert('you pressed enter ^_^');
}
})

What I actually prefer to do is register even on the wrapping form. This way uses can interact with the page as they normally would have.
$('form').submit(function (e) {
e.preventDefault();
...
});
This way user can both press one of the submit buttons or hit enter while input fields are focused.
e.preventDefault() is used to prevent browser from actually submitting the form, which would cause page to be refreshed.
Another benefit of this approach is that, in future, if form is changed and new fields/submit buttons are added, event will still e handled properly.
Cheers.

Button Hidden and clickable when press "enter" in not a form

I'm using ajax to submit a form without refreshing the page.
The problem is, I want to submit the form by pressing enter. If I was using a form field it would be easy, cause I only had to put,
hidden="true"
here is my code:
<div id="form">
<input type="text" id="text" />
<button hidden="true" id="submit_button"></button>
</div>
Jquery Code
$(document).ready(function() {
document.getElementById("submit_button").onclick= function(){submit_form()}
/*
ajax request to submit.php
*/;
});

You can listen to keyDown event.
$('#text').keydown(function (e){ //OR on keyup
if(e.keyCode == 13){
submit_form()
}
})

Try this:
$(document).keypress(function (e) {
var key = e.which;
if(key == 13) // the enter key code
{
submit_form()
}
});

I don't know if I understand, but if you want to can add the keypress trigger into the inbox:
$('#text').keydown(function(e){
if (e.keyCode == 13){
// Do as you need, ex:
$('#form').submit();
return false;
}
else return true;
});

How to prevent form submission using the keyboard (esp. the space key)

I have a web application where on one specific screen I have to make sure the user clicked the button using the mouse as opposed to just pressing enter or space.
I have written this code:
$('button').keydown(function (e) {
if (e.which === 10 || e.which === 13 || e.which === 32) {
return false;
}
});
However, this only works for enter. The form can still be submitted by pressing space on a button. I am just wondering what caused this inconsistency and how to get around it?
Edit:
Example fiddle: http://jsfiddle.net/billccn/3JmtY/1/. Check the second check box and pressing enter while the focus is on the button will have no effect. If I further disable the input and expand the keydown trapping to the whole form, then enter cannot be used to submit the form.
Edit 2:
I do have a backup plan which is replacing the button with a link or even a plain div and use the click event to submit the form programmatically. However, extra work is required to make it look like a button so I'd rather use a button is possible.

Just found out: handling space (32) on keyup will prevent the click event.
Updated fiddle: http://jsfiddle.net/3JmtY/2/

Missed the Point of your Question. After some googleing if found the following trick:
Bind the keypress event to your from and listen to it's keycode. If the keycode is 13
(enter), prevent all default actions (event.preventDefaul()) and prevent further event bubbeling ( return false; ).
Her is a fiddler code example:
HTML:
<form id="target" action="destination.html">
<input type="text" value="Hello there" />
<input type="submit" value="Go" />
</form>
<div id="other">Trigger the handler</div>
JavaScript:
$('#target').keypress(function (event) {
var code = event.keyCode || event.which;
if (code == 13) {
event.preventDefault();
return false;
}
});
$('#target').submit(function (event, data2) {
debugger;
alert('test');
return false;
});
Fiddler: http://jsfiddle.net/ggTDs/
Note that the form is not submited when enter is clicked!

Use below code. 13 for Enter key and 32 for Spacebar.
$("#form_id").on('keydown keyup keypress', function( e ) {
if ( e.keyCode == 13 || e.which == 13 || e.which == 32 ) {
e.preventDefault();
return false;
}
});

Prevent form submission with enter key

I just wrote this nifty little function which works on the form itself...
$("#form").keypress(function(e) {
if (e.which == 13) {
var tagName = e.target.tagName.toLowerCase();
if (tagName !== "textarea") {
return false;
}
}
});
In my logic I want to accept carriage returns during the input of a textarea. Also, it would be an added bonus to replace the enter key behavior of input fields with behavior to tab to the next input field (as if the tab key was pressed). Does anyone know of a way to use the event propagation model to correctly fire the enter key on the appropriate element, but prevent form submitting on its press?

You can mimic the tab key press instead of enter on the inputs like this:
//Press Enter in INPUT moves cursor to next INPUT
$('#form').find('.input').keypress(function(e){
if ( e.which == 13 ) // Enter key = keycode 13
{
$(this).next().focus(); //Use whatever selector necessary to focus the 'next' input
return false;
}
});
You will obviously need to figure out what selector(s) are necessary to focus on the next input when Enter is pressed.

Note that single input forms always get submitted when the enter key is pressed. The only way to prevent this from happening is this:
<form action="/search.php" method="get">
<input type="text" name="keyword" />
<input type="text" style="display: none;" />
</form>

Here is a modified version of my function. It does the following:
Prevents the enter key from working
on any element of the form other
than the textarea, button, submit.
The enter key now acts like a tab.
preventDefault(), stopPropagation() being invoked on the element is fine, but invoked on the form seems to stop the event from ever getting to the element.
So my workaround is to check the element type, if the type is not a textarea (enters permitted), or button/submit (enter = click) then we just tab to the next thing.
Invoking .next() on the element is not useful because the other elements might not be simple siblings, however since DOM pretty much garantees order when selecting so all is well.
function preventEnterSubmit(e) {
if (e.which == 13) {
var $targ = $(e.target);
if (!$targ.is("textarea") && !$targ.is(":button,:submit")) {
var focusNext = false;
$(this).find(":input:visible:not([disabled],[readonly]), a").each(function(){
if (this === e.target) {
focusNext = true;
}
else if (focusNext){
$(this).focus();
return false;
}
});
return false;
}
}
}

From a usability point of view, changing the enter behaviour to mimic a tab is a very bad idea. Users are used to using the enter key to submit a form. That's how the internet works. You should not break this.

The post Enter Key as the Default Button describes how to set the default behaviour for enter key press. However, sometimes, you need to disable form submission on Enter Key press. If you want to prevent it completely, you need to use OnKeyPress handler on tag of your page.
<body OnKeyPress="return disableKeyPress(event)">
The javascript code should be:
<script language="JavaScript">
function disableEnterKey(e)
{
var key;
if(window.event)
key = window.event.keyCode; //IE
else
key = e.which; //firefox
return (key != 13);
}
</script>
If you want to disable form submission when enter key is pressed in an input field, you must use the function above on the OnKeyPress handler of the input field as follows:
<input type="text" name="txtInput" onKeyPress="return disableEnterKey(event)">
Source: http://www.bloggingdeveloper.com/post/Disable-Form-Submit-on-Enter-Key-Press.aspx

Set trigger for both the form and the inputs, but when the input events are triggered, stop the propagation to the form by calling the stopPropagation method.
By the way, IMHO, it's not a great thing to change default behaviors to anything any average user is used to - that's what make them angry when using your system. But if you insist, then the stopPropagation method is the way to go.

In my case i wanted to prevent it only in a dinamically created field, and activate some other button, so it was a little bit diferent.
$(document).on( 'keypress', '.input_class', function (e) {
if (e.charCode==13) {
$(this).parent('.container').children('.button_class').trigger('click');
return false;
}
});
In this case it will catch the enter key on all input's with that class, and will trigger the button next to them, and also prevent the primary form to be submited.
Note that the input and the button have to be in the same container.

The previous solutions weren't working for me, but I did find a solution.
This waits for any keypress, test which match 13, and returns false if so.
in the <HEAD>
function stopRKey(evt) {
var evt = (evt) ? evt : ((event) ? event : null);
var node = (evt.target) ? evt.target : ((evt.srcElement) ? evt.srcElement : null);
if ((evt.which == 13) && (node.type == "text")) {
return false;
}
}
document.onkeypress = stopRKey;

I prefer the solution of #Dmitriy Likhten, yet:
it only worked when I changed the code a bit:
[...] else
{
if (focusNext){
$(this).focus();
return false; } //
}
Otherwise the script didn't work.
Using Firefox 48.0.2

I modified Dmitriy Likhten's answer a bit, works good. Included how to reference the function to the event. note that you don't include () or it will execute. We're just passing a reference.
$(document).ready(function () {
$("#item-form").keypress(preventEnterSubmit);
});
function preventEnterSubmit(e) {
if (e.which == 13) {
var $targ = $(e.target);
if (!$targ.is("textarea") && !$targ.is(":button,:submit")) {
var focusNext = false;
$(this).find(":input:visible:not([disabled],[readonly]), a").each(function () {
if (this === e.target) {
focusNext = true;
} else {
if (focusNext) {
$(this).focus();
return false;
}
}
});
return false;
}
}
}

Prevent form submission on Enter key press

I have a form with two text boxes, one select drop down and one radio button. When the enter key is pressed, I want to call my JavaScript function, but when I press it, the form is submitted.
How do I prevent the form from being submitted when the enter key is pressed?

if(characterCode == 13) {
// returning false will prevent the event from bubbling up.
return false;
} else{
return true;
}
Ok, so imagine you have the following textbox in a form:
<input id="scriptBox" type="text" onkeypress="return runScript(event)" />
In order to run some "user defined" script from this text box when the enter key is pressed, and not have it submit the form, here is some sample code. Please note that this function doesn't do any error checking and most likely will only work in IE. To do this right you need a more robust solution, but you will get the general idea.
function runScript(e) {
//See notes about 'which' and 'key'
if (e.keyCode == 13) {
var tb = document.getElementById("scriptBox");
eval(tb.value);
return false;
}
}
returning the value of the function will alert the event handler not to bubble the event any further, and will prevent the keypress event from being handled further.
NOTE:
It's been pointed out that keyCode is now deprecated. The next best alternative which has also been deprecated.
Unfortunately the favored standard key, which is widely supported by modern browsers, has some dodgy behavior in IE and Edge. Anything older than IE11 would still need a polyfill.
Furthermore, while the deprecated warning is quite ominous about keyCode and which, removing those would represent a massive breaking change to untold numbers of legacy websites. For that reason, it is unlikely they are going anywhere anytime soon.

Use both event.which and event.keyCode:
function (event) {
if (event.which == 13 || event.keyCode == 13) {
//code to execute here
return false;
}
return true;
};

event.key === "Enter"
More recent and much cleaner: use event.key. No more arbitrary number codes!
NOTE: The old properties (.keyCode and .which) are Deprecated.
const node = document.getElementsByClassName("mySelect")[0];
node.addEventListener("keydown", function(event) {
if (event.key === "Enter") {
event.preventDefault();
// Do more work
}
});
Modern style, with lambda and destructuring
node.addEventListener("keydown", ({key}) => {
if (key === "Enter") // Handle press
})
Mozilla Docs
Supported Browsers

If you're using jQuery:
$('input[type=text]').on('keydown', function(e) {
if (e.which == 13) {
e.preventDefault();
}
});

Detect Enter key pressed on whole document:
$(document).keypress(function (e) {
if (e.which == 13) {
alert('enter key is pressed');
}
});
http://jsfiddle.net/umerqureshi/dcjsa08n/3/

Override the onsubmit action of the form to be a call to your function and add return false after it, ie:
<form onsubmit="javascript:myfunc();return false;" >

A react js solution
handleChange: function(e) {
if (e.key == 'Enter') {
console.log('test');
}
<div>
<Input type="text"
ref = "input"
placeholder="hiya"
onKeyPress={this.handleChange}
/>
</div>

So maybe the best solution to cover as many browsers as possible and be future proof would be
if (event.which === 13 || event.keyCode === 13 || event.key === "Enter")

Here is how you can do it using JavaScript:
//in your **popup.js** file just use this function
var input = document.getElementById("textSearch");
input.addEventListener("keyup", function(event) {
event.preventDefault();
if (event.keyCode === 13) {
alert("yes it works,I'm happy ");
}
});
<!--Let's say this is your html file-->
<!DOCTYPE html>
<html>
<body style="width: 500px">
<input placeholder="Enter the text and press enter" type="text" id="textSearch"/>
<script type="text/javascript" src="public/js/popup.js"></script>
</body>
</html>

Below code will add listener for ENTER key on entire page.
This can be very useful in screens with single Action button eg Login, Register, Submit etc.
<head>
<!--Import jQuery IMPORTANT -->
<script src="https://code.jquery.com/jquery-2.1.1.min.js"></script>
<!--Listen to Enter key event-->
<script type="text/javascript">
$(document).keypress(function (e) {
if (e.which == 13 || event.keyCode == 13) {
alert('enter key is pressed');
}
});
</script>
</head>
Tested on all browsers.

A jQuery solution.
I came here looking for a way to delay the form submission until after the blur event on the text input had been fired.
$(selector).keyup(function(e){
/*
* Delay the enter key form submit till after the hidden
* input is updated.
*/
// No need to do anything if it's not the enter key
// Also only e.which is needed as this is the jQuery event object.
if (e.which !== 13) {
return;
}
// Prevent form submit
e.preventDefault();
// Trigger the blur event.
this.blur();
// Submit the form.
$(e.target).closest('form').submit();
});
Would be nice to get a more general version that fired all the delayed events rather than just the form submit.

A much simpler and effective way from my perspective should be :
function onPress_ENTER()
{
var keyPressed = event.keyCode || event.which;
//if ENTER is pressed
if(keyPressed==13)
{
alert('enter pressed');
keyPressed=null;
}
else
{
return false;
}
}

A little simple
Don't send the form on keypress "Enter":
<form id="form_cdb" onsubmit="return false">
Execute the function on keypress "Enter":
<input type="text" autocomplete="off" onkeypress="if(event.key === 'Enter') my_event()">

Using TypeScript, and avoid multiples calls on the function
let el1= <HTMLInputElement>document.getElementById('searchUser');
el1.onkeypress = SearchListEnter;
function SearchListEnter(event: KeyboardEvent) {
if (event.which !== 13) {
return;
}
// more stuff
}

<div class="nav-search" id="nav-search">
<form class="form-search">
<span class="input-icon">
<input type="text" placeholder="Search ..." class="nav-search-input" id="search_value" autocomplete="off" />
<i class="ace-icon fa fa-search nav-search-icon"></i>
</span>
<input type="button" id="search" value="Search" class="btn btn-xs" style="border-radius: 5px;">
</form>
</div>
<script type="text/javascript">
$("#search_value").on('keydown', function(e) {
if (e.which == 13) {
$("#search").trigger('click');
return false;
}
});
$("#search").on('click',function(){
alert('You press enter');
});
</script>

native js (fetch api)
document.onload = (() => {
alert('ok');
let keyListener = document.querySelector('#searchUser');
//
keyListener.addEventListener('keypress', (e) => {
if(e.keyCode === 13){
let username = e.target.value;
console.log(`username = ${username}`);
fetch(`https://api.github.com/users/${username}`,{
data: {
client_id: 'xxx',
client_secret: 'xxx'
}
})
.then((user)=>{
console.log(`user = ${user}`);
});
fetch(`https://api.github.com/users/${username}/repos`,{
data: {
client_id: 'xxx',
client_secret: 'xxx'
}
})
.then((repos)=>{
console.log(`repos = ${repos}`);
for (let i = 0; i < repos.length; i++) {
console.log(`repos ${i} = ${repos[i]}`);
}
});
}else{
console.log(`e.keyCode = ${e.keyCode}`);
}
});
})();
<input _ngcontent-inf-0="" class="form-control" id="searchUser" placeholder="Github username..." type="text">

<form id="form1" runat="server" onkeypress="return event.keyCode != 13;">
Add this Code In Your HTML Page...it will disable ...Enter Button..

Cross Browser Solution
Some older browsers implemented keydown events in a non-standard way.
KeyBoardEvent.key is the way it is supposed to be implemented in modern browsers.
which
and keyCode are deprecated nowadays, but it doesn't hurt to check for these events nonetheless so that the code works for users that still use older browsers like IE.
The isKeyPressed function checks if the pressed key was enter and event.preventDefault() hinders the form from submitting.
if (isKeyPressed(event, 'Enter', 13)) {
event.preventDefault();
console.log('enter was pressed and is prevented');
}
Minimal working example
JS
function isKeyPressed(event, expectedKey, expectedCode) {
const code = event.which || event.keyCode;
if (expectedKey === event.key || code === expectedCode) {
return true;
}
return false;
}
document.getElementById('myInput').addEventListener('keydown', function(event) {
if (isKeyPressed(event, 'Enter', 13)) {
event.preventDefault();
console.log('enter was pressed and is prevented');
}
});
HTML
<form>
<input id="myInput">
</form>
https://jsfiddle.net/tobiobeck/z13dh5r2/

Use event.preventDefault() inside user defined function
<form onsubmit="userFunction(event)"> ...
function userFunction(ev)
{
if(!event.target.send.checked)
{
console.log('form NOT submit on "Enter" key')
ev.preventDefault();
}
}
Open chrome console> network tab to see
<form onsubmit="userFunction(event)" action="/test.txt">
<input placeholder="type and press Enter" /><br>
<input type="checkbox" name="send" /> submit on enter
</form>

I used document on, which covers dynamically added html after page load:
$(document).on('keydown', '.selector', function (event) {
if (event.which == 13 || event.keyCode == 13) {
//do your thang
}
});
Added updates from #Bradley4