I have a number input that should trigger jQuery on every change.
To do this, I do a $('#id').bind('keyup change', ...);
, which is triggered on any keyup or mouse-controller changed.
This works find for mouse clicks (triggers change
) and for typing numbers (triggers keyup
). But for the cursor keys it triggers both change
and keyup
. How can I make it so it only triggers once in all situations?
Here's an example showing the problem: http://jsfiddle.net/jSjkE/
You have a wrong concept about the onchange
event.
It does NOT fire when the element's value changes, instead, it fires only when 2 conditions are met:
Note: The above is for inputs of type text
. For types checkbox
/radio
it fires as soon as their checked
property changes, and for select
elements as soon as its selected option changes.
The onchange
event (possibly wrongly) fires when you press Chrome's input type="number"
up/down arrows. You should not rely on it, as many other major browsers don't even have an implementation of the number inputs yet and may not follow this behavior.
Instead, as you're using HTML5, you should rely on the oninput
HTML5 event, which fires whenever the element's value is updated.
$(function() {
var count = 0;
$('#num').on('input', function(e) {
console.log('update ' + (++count) + ' Value: ' + this.value);
});
});
Fiddle
edit:
For older (and non-HTML5) browsers, you may use the keyup
event as a fallback:
$('#num').on('input keyup', function(e) {
The most resilient way to do this for non-HTML5 browsers would be having a setInterval
constantly checking if the element's value has changed, as keyup
does not trigger if you select some text and drag it into the textbox - you could try .on('input keyup mouseup'
, but then it wouldn't trigger if the user uses the browser's Edit > Paste menu.
edit2:
If you don't want to use setInterval
, you can put a huge events map inside the .on
/.bind
and check if the value has changed by storing the current value in the .data()
of the element:
var count = 0;
$('#num').on('input keyup change', function(e) {
if (this.value == $(this).data('curr_val'))
return false;
$(this).data('curr_val', this.value);
console.log('update ' + (++count) + ' Value: ' + this.value);
});
Fiddle
I've added the onchange
event to the events map, so even if the oninput
and onkeyup
fails (non-html5 browser using the browser's menu to paste data), the onchange
event will still fire when the element loses focus.
Here's the final edit with a commented setInterval
and .data()
to avoid using globals, so you can choose which of the fallbacks to use:
$(function() {
var $num = $('#num');
$num.data('curr_val', $num.val()); //sets initial value
var count = 0;
setInterval(function(){
if ($num.data('curr_val') == $num.val()) //if it still has same value
return false; //returns false
$num.data('curr_val', $num.val()); //if val is !=, updates it and
//do your stuff
console.log('update ' + (++count) + ' Value: ' + $num.val());
}, 100); //100 = interval in miliseconds
});
Fiddle
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