How to do that?
I tried:
var key = event.which || event.keyCode || event.charCode;
if(key == 8) alert('backspace');
but it doesn't work...
If I do the same on the keypress event it works, but I don't want to use keypress because it outputs the typed character in my input field. I need to be able to control that
my code:
$('#content').bind('input', function(event){
var text = $(this).val(),
key = event.which || event.keyCode || event.charCode;
if(key == 8){
// here I want to ignore backspace and del
}
// here I'm doing my stuff
var new_text = 'bla bla'+text;
$(this).val(new_text);
});
no character should be appended in my input, besides what I'm adding with val() actually the input from the user should be completely ignored, only the key pressing action is important to me
This question is related to
javascript
jquery
With jQuery
The event.which property normalizes event.keyCode and event.charCode. It is recommended to watch event.which for keyboard key input.
http://api.jquery.com/event.which/
jQuery('#input').on('keydown', function(e) {
if( e.which == 8 || e.which == 46 ) return false;
});
It's an old question, but if you wanted to catch a backspace event on input, and not keydown, keypress, or keyup—as I've noticed any one of these break certain functions I've written and cause awkward delays with automated text formatting—you can catch a backspace using inputType:
document.getElementsByTagName('input')[0].addEventListener('input', function(e) {
if (e.inputType == "deleteContentBackward") {
// your code here
}
});
keydown
with event.key === "Backspace" or "Delete"
More recent and much cleaner: use event.key
. No more arbitrary number codes!
input.addEventListener('keydown', function(event) {
const key = event.key; // const {key} = event; ES6+
if (key === "Backspace" || key === "Delete") {
return false;
}
});
Modern style:
input.addEventListener('keydown', ({key}) => {
if (["Backspace", "Delete"].includes(key)) {
return false
}
})
//Here's one example, not sure what your application is but here is a relevant and likely application
function addDashesOnKeyUp()
{
var tb = document.getElementById("tb1");
var key = event.which || event.keyCode || event.charCode;
if((tb.value.length ==3 || tb.value.length ==7 )&& (key !=8) )
{
tb.value += "-"
}
}
More recent and much cleaner: use event.key
. No more arbitrary number codes!
input.addEventListener('keydown', function(event) {
const key = event.key; // const {key} = event; ES6+
if (key === "Backspace" || key === "Delete") {
return false;
}
});
on android devices using chrome we can't detect a backspace. You can use workaround for it:
var oldInput = '',
newInput = '';
$("#ID").keyup(function () {
newInput = $('#ID').val();
if(newInput.length < oldInput.length){
//backspace pressed
}
oldInput = newInput;
})
$('div[contenteditable]').keydown(function(e) {
// trap the return key being pressed
if (e.keyCode === 13 || e.keyCode === 8)
{
return false;
}
});
Have you tried using 'onkeydown'? This is the event you are looking for.
It operates before the input is inserted and allows you to cancel char input.
Source: Stackoverflow.com