In JavaScript, is it possible to distinguish between beforeunload events that were triggered by the user closing a browser tab vs clicking a mailto link?
Basically, I would like to do this:
window.addEventListener("beforeunload", function (e) {
if(browserTabClosed) {
// Do one thing
}
else if (mailtoLinkClicked) {
// Do a different thing
}
}
Found a solution by looking at the event (e below) that gets passed in:
window.addEventListener("beforeunload", function (e) {
// We can use `e.target.activeElement.nodeName`
// to check what triggered the passed-in event.
// - If triggered by closing a browser tab: The value is "BODY"
// - If triggered by clicking a link: The value is "A"
const isLinkClicked = (e.target.activeElement.nodeName === "A");
// If triggered by clicking a link
if (isLinkClicked) {
// Do one thing
}
// If triggered by closing the browser tab
else {
// Do a different thing
}
}
The beforeunload method has an unstable behaviour between browsers, the reason is that browser implementations try to avoid popups and other malicious code runned inside this handler.
There is actually no general (cross-browser) way to detect what triggered the beforeunload event.
Said that, in your case you could just detect a click on the window to discriminate between the two required behaviours:
window.__exit_with_link = false;
window.addEventListener('click', function (e) {
// user clicked a link
var isLink = e.target.tagName.toLowerCase() === 'a';
// check if the link has this page as target:
// if is targeting a popup/iframe/blank page
// the beforeunload on this page
// would not be triggered anyway
var isSelf = !a.target.target || a.target.target.toLowerCase() === '_self';
if (isLink && isSelf) {
window.__exit_with_link = true;
// ensure reset after a little time
setTimeout(function(){ window.__exit_with_link = false; }, 50);
}
else { window.__exit_with_link = false; }
});
window.addEventListener('beforeunload', function (e) {
if (window.__exit_with_link) {
// the user exited the page by clicking a link
}
else {
// the user exited the page for any other reason
}
}
Obviously it is not the proper way, but still working.
At the same way, you could add other handlers to check other reasons the user left the page (eg. keyboard CTRL-R for refresh, etc.)
I have a website which has regular spacebar functionality, not just inside an input box, so I can't make it return false if the target is the body. I just want to stop it from scrolling down the page, but allow the other functionality. Is it possible to do this using vanilla JS? Here is my code:
//Many other functions here
function spacebar() {
window.onkeydown = function(e) {
if ((watch.isOn) && (!done)) {//u can stop it with any key
watch.freeze();//stop the stopwatch
}
else if (e.keyCode == 32) {
if (done) {
watch.start();//start the stopwatch
stage = 1;
}
if (stage === 0) {
stage = 1;
}
}
}
<html>
<body>
<h1 id="timer">0:00.000</h1>
<script src="js/timer.js"></script>
<!--The JS starts and stops this timer.-->
</body>
</html>
So it starts the timer when the spacebar is pressed, and stops it when any key is pressed.
A default behaviour of pressing the spacebar is to scroll. We have the ability to prevent default behaviors using
event.preventDefault();
You are using window.onkeydown, passing the event argument as var e. You know how to recognize keys by keycode, as you have demonstrated. Now then, if the key that is pressed is the spacebar, then prevent the default behaviors (in this case that includes scrolling). You have the option to define your own behavior instead.
What you can do is that You can add e.preventDefault(); with your functionality like as i can play and pause the song but restrict the Scrolling.
$(window).keypress(function(e) {
if (e.which == 32) {
const isMusicPaused = wrapper.classList.contains("paused");
isMusicPaused ? pausedMusic() : playMusic();
e.preventDefault();
}});
I need to archieve 2 objectives but I archive one at time, never both of them.
First I have an input field that should fires an event when a key is pressed and I need to catch the field value. I use letters, number and the TAB key. So if I use keyup it fires at the first char. If I use keydown it takes 2 char to fire because when it fires the first time the char is not pressed yet. So when I press for the second time it fires with the first letter and so on.
Said that, it is clear that what I need is the keyup event that put the value in the field then the event is fired. But TAB has a special meaning in my case and it is not the default behavior and with TAB key I am unable to catch e.which, e.charCode nor e.keyCode! Only with keydown I am able to get those value!
Now I don´t have a clue what to do. How could I catch TAB key or make keydown catch the value of a field?
P.S keypress also working as keydown. Event is fired before I have the value in the field
EDIT 1:
Here is the code:
$('input[data-action="keyupNome"]').each(function () {
$(this).on("keypress", function(e) {
//Se o campo não estiver vazio
if($(this).val() != '') {
if(key != 9) // the tab key code
{
limpaCamposBusca('nome');
var width = $('#nomeBusca').width();
$('.nomeContainer').css('width', width);
$('.displayNomeTbl').css('width', width);
buscaEndereco('Controller/Dispatcher.php?classe=Buscas&acao=buscaEnderecoPorNome', 'nome');
}//if key == 9
else {
alert('here');
e.preventDefault();
}
}// val == ''
else {
clearFields();
clearBuscaCliente();
reactivateFields();
}
});
});
The trick is to use keydown and to combine actual value of the field with the char currently pressed OR to catch TAB in keydown and set an external variable to be used in keyup as in my example.
EDIT :
In fact, I realized that not preventing default behavior of TAB in keydown doesn't fire keyup. So, no variable is needed, but only preventing TAB on keydown. Anyhow, this version always work if the glitch you talked about exist in some circumstances.
(function() {
var tabKeyPressed = false;
$("#t").keydown(function(e) {
tabKeyPressed = e.keyCode == 9;
if (tabKeyPressed) {
e.preventDefault();
return;
}
});
$("#t").keyup(function(e) {
if (tabKeyPressed) {
$(this).val("TAB"); // Do stuff for TAB
e.preventDefault();
return;
}
//Do other stuff when not TAB
});
})();
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<input id="t" value="">
Some of my users accidentally hit F5 when they are typing, and cause them to lose all the stuff they have typed. I do not need to prevent hitting Refresh button.
I tried to use the following javascript, but it only works when the user does not focus on the Silverlight app (i.e. it works when the user click on somewhere outside of the SL app, but the onkeydown event is not triggered when the user focus on the SL).
document.onkeydown=function(e) {
var event = window.event || e;
if (event.keyCode == 116) {
event.keyCode = 0;
alert("test");
return false;
}
}
Probably the best way of handling this situation would be to use the onbeforeunload event and ask the user for confirmation. This way you can root out the accidental refreshes or closed tabs from the legitimate ones without handling all possible shortcuts.
window.onbeforeunload = function(e) {
return 'Are you sure you want to leave without saving your changes?';
};
You could even display the confirmation dialog only if there are some unsaved changes.
I'd say, something like this?
document.onkeydown = function()
{
switch (event.keyCode)
{
case 116 : //F5 button
event.returnValue = false;
event.keyCode = 0;
return false;
case 82 : //R button
if (event.ctrlKey)
{
event.returnValue = false;
event.keyCode = 0;
return false;
}
}
}
note: ctrl + r is a shortcut to refresh as well
I have been trying to disable the Enter key on my form. The code that I have is shown below. For some reason the enter key is still triggering the submit. The code is in my head section and seems to be correct from other sources.
disableEnterKey: function disableEnterKey(e){
var key;
if(window.event)
key = window.event.keyCode; //IE
else
key = e.which; //firefox
return (key != 13);
},
if you use jQuery, its quite simple. Here you go
$(document).keypress(
function(event){
if (event.which == '13') {
event.preventDefault();
}
});
Most of the answers are in jquery. You can do this perfectly in pure Javascript, simple and no library required. Here it is:
<script type="text/javascript">
window.addEventListener('keydown',function(e){if(e.keyIdentifier=='U+000A'||e.keyIdentifier=='Enter'||e.keyCode==13){if(e.target.nodeName=='INPUT'&&e.target.type=='text'){e.preventDefault();return false;}}},true);
</script>
This code works great because, it only disables the "Enter" keypress action for input type='text'. This means visitors are still able to use "Enter" key in textarea and across all of the web page. They will still be able to submit the form by going to the "Submit" button with "Tab" keys and hitting "Enter".
Here are some highlights:
It is in pure javascript (no library required).
Not only it checks the key pressed, it confirms if the "Enter" is hit on the input type='text' form element. (Which causes the most faulty form submits
Together with the above, user can use "Enter" key anywhere else.
It is short, clean, fast and straight to the point.
If you want to disable "Enter" for other actions as well, you can add console.log(e); for your your test purposes, and hit F12 in chrome, go to "console" tab and hit "backspace" on the page and look inside it to see what values are returned, then you can target all of those parameters to further enhance the code above to suit your needs for "e.target.nodeName", "e.target.type" and many more...
In your form tag just paste this:
onkeypress="return event.keyCode != 13;"
Example
<input type="text" class="search" placeholder="search" onkeypress="return event.keyCode != 13;">
This can be useful if you want to do search when typing and ignoring ENTER.
/// Grab the search term
const searchInput = document.querySelector('.search')
/// Update search term when typing
searchInput.addEventListener('keyup', displayMatches)
try this ^^
$(document).ready(function() {
$("form").bind("keypress", function(e) {
if (e.keyCode == 13) {
return false;
}
});
});
Hope this helps
For a non-javascript solution, try putting a <button disabled>Submit</button> into your form, positioned before any other submit buttons/inputs. I suggest immediately after the <form> opening tag (and using CSS to hide it, accesskey='-1' to get it out of the tab sequence, etc)
AFAICT, user agents look for the first submit button when ENTER is hit in an input, and if that button is disabled will then stop looking for another.
A form element's default button is the first submit button in tree order whose form owner is that form element.
If the user agent supports letting the user submit a form implicitly (for example, on some platforms hitting the "enter" key while a text field is focused implicitly submits the form), then doing so for a form whose default button has a defined activation behavior must cause the user agent to run synthetic click activation steps on that default button.
Consequently, if the default button is disabled, the form is not submitted when such an implicit submission mechanism is used. (A button has no activation behavior when disabled.)
https://www.w3.org/TR/html5/forms.html#implicit-submission
However, I do know that Safari 10 MacOS misbehaves here, submitting the form even if the default button is disabled.
So, if you can assume javascript, insert <button onclick="return false;">Submit</button> instead. On ENTER, the onclick handler will get called, and since it returns false the submission process stops. Browsers I've tested this with won't even do the browser-validation thing (focussing the first invalid form control, displaying an error message, etc).
The solution is so simple:
Replace type "Submit" with button
<input type="button" value="Submit" onclick="this.form.submit()" />
this is in pure javascript
document.addEventListener('keypress', function (e) {
if (e.keyCode === 13 || e.which === 13) {
e.preventDefault();
return false;
}
});
Here's a simple way to accomplish this with jQuery that limits it to the appropriate input elements:
//prevent submission of forms when pressing Enter key in a text input
$(document).on('keypress', ':input:not(textarea):not([type=submit])', function (e) {
if (e.which == 13) e.preventDefault();
});
Thanks to this answer: https://stackoverflow.com/a/1977126/560114.
Just add following code in <Head> Tag in your HTML Code. It will Form submission on Enter Key For all fields on form.
<script type="text/javascript">
function stopEnterKey(evt) {
var evt = (evt) ? evt : ((event) ? event : null);
var node = (evt.target) ? evt.target : ((evt.srcElement) ? evt.srcElement : null);
if ((evt.keyCode == 13) && (node.type == "text")) { return false; }
}
document.onkeypress = stopEnterKey;
</script>
You can try something like this, if you use jQuery.
$("form").bind("keydown", function(e) {
if (e.keyCode === 13) return false;
});
That will wait for a keydown, if it is Enter, it will do nothing.
I checked all the above solutions, they don't work. The only possible solution is to catch 'onkeydown' event for each input of the form.
You need to attach disableAllInputs to onload of the page or via jquery ready()
/*
* Prevents default behavior of pushing enter button. This method doesn't work,
* if bind it to the 'onkeydown' of the document|form, or to the 'onkeypress' of
* the input. So method should be attached directly to the input 'onkeydown'
*/
function preventEnterKey(e) {
// W3C (Chrome|FF) || IE
e = e || window.event;
var keycode = e.which || e.keyCode;
if (keycode == 13) { // Key code of enter button
// Cancel default action
if (e.preventDefault) { // W3C
e.preventDefault();
} else { // IE
e.returnValue = false;
}
// Cancel visible action
if (e.stopPropagation) { // W3C
e.stopPropagation();
} else { // IE
e.cancelBubble = true;
}
// We don't need anything else
return false;
}
}
/* Disable enter key for all inputs of the document */
function disableAllInputs() {
try {
var els = document.getElementsByTagName('input');
if (els) {
for ( var i = 0; i < els.length; i++) {
els[i].onkeydown = preventEnterKey;
}
}
} catch (e) {
}
}
I think setting a class to a form is much better. so I coded that:
HTML
<form class="submit-disabled">
JS
/**
* <Start>
* Submit Disabled Form
*/
document
.querySelector('.submit-disabled')
.addEventListener('submit', function (e) {
e.preventDefault()
});
/**
* </End>
* Submit Disabled Form
*/
And also if you want to disable submitting only when Enter Key press:
/**
* <Start>
* Submit Disabled Form
*/
document
.querySelector('.submit-disabled')
.addEventListener('keypress', function (e) {
if (e.keyCode === 13) {
e.preventDefault()
}
});
/**
* </End>
* Submit Disabled Form
*/
in HTML file:
#keypress="disableEnterKey($event)"
in js file:
disableEnterKey(e) {
if (e.keyCode === 13) {
e.preventDefault();
}
}
First you need to disable the form on submit, but re-enable it when clicked on the button. which or keycode is not used in this case, avoiding some problems with compatibility.
let formExample = document.getElementbyId("formExample");//selects the form
formExample.addEventListener("submit", function(event){ //must be used "submit"
event.preventDefault();// prevents "form" from being sent
})
To reactivate and submit the form by clicking the button:
let exampleButton = document.getElementById("exampleButton");
exampleButton.addEventListener("click", activateButton); //calls the function "activateButton()" on click
function activateButton(){
formExample.submit(); //submits the form
}
a variation of this would be
let exampleButton = document.getElementById("exampleButton");
exampleButton.addEventListener("click", activateBtnConditions); //calls the function "activateBtnConditions()" on click
function activateBtnConditions(){
if(condition){
instruction
}
else{
formExample.submit()
}
}
Here is a modern, simple and reactive solution which works in:
React, Solidjs, JSX etc.
is written in Typescript
supports server-side rendering (SSR)
all modern browsers
does NOT require jQuery
blocks ALL Enter keys outside of <textarea> where you want to allow Enter
// avoids accidential form submission, add via event listener
function blockEnterKey(e: KeyboardEvent) {
if (e.key == "Enter" && !(e.target instanceof HTMLTextAreaElement)) {
e.preventDefault()
}
}
// add the event listener before the rendering return in React, etc.
if (typeof window !== undefined) {
window.addEventListener("keydown", blockEnterKey)
// the following line is for Solidjs. React has similar cleanup functionality
// onCleanup(() => document.body.removeEventListener("keydown", blockEnterKey))
}
return(
<form>
...
</form>
)
The better way I found here:
Dream.In.Code
action="javascript: void(0)" or action="return false;" (doesn't work on me)