I want to clear out a textbox when I call:
$('#textBox').val(''); or $('#textBox').empty();
Originally, when I would manually backspace and delete the text out of the text box, the on change function would fire. If I run $('#textBox').val('') above, on change does not fire:
$(document).ready(function() {
$('#textBox').on('change', function(){
Why is this?
Use trigger, like this:
$("#testBox").val("").trigger("change");
When you change the value programmatically, just trigger the change event using trigger.
$("#myid").trigger("change");
It's not jQuery that doesn't fire the event, it's the browser. If you look it up in the specs you'll see the definition of the change event:
change
The change event occurs when a control loses the input focus and its value has been
modified since gaining focus. This event is valid for INPUT, SELECT, and
TEXTAREA. element.
Bubbles: Yes
Cancelable: No
Context Info: None
As already posted, your problem can be mitigated by triggering the event manually via trigger().
Related
I have added change event on the input field so that whenever user enters the text into it, so other task should happen, it works but when i click outside the input field.I don't know whether it is default behavior or i am doing some thing wrong. I tried using keyup and keydown events and it works as expect.
Please suggest.
Here is my code:
$("#mobile-number").on('change',function(){
// some other code
});
The change event fires when an elements value changes.
For select boxes, checkboxes, and radio buttons, the event is fired immediately when the user makes a selection with the mouse, but for the other element types the event is deferred until the element loses focus.
In other words, on an input, the change event fires when the element loses focus, not when you type, and that is the default behaviour.
That's why there are key events as well, and on modern browsers you can catch most changes to an input with the input event
$("#mobile-number").on('input',function(){ ...
Yes, it is the desired behavior.
Change Event
The change event is fired for , , and
elements when a change to the element's value is committed by the
user. Unlike the input event, the change event is not necessarily
fired for each change to an element's value.
Depending on the kind of form element being changed and the way the
user interacts with the element, the change event fires at a different
moment:
When the element is activated (by clicking or using the keyboard) for and ;
When the user commits the change explicitly (e.g. by selecting a value from a 's dropdown with a mouse click, by selecting a
date from a date picker for , by selecting a file
in the file picker for , etc.);
When the element loses focus after its value was changed, but not commited (e.g. after editing the value of or ).
Try using input event:
$(function() {
$("#mobile-number").on('input', function() {
$("#copy").val(this.value);
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<input type='text' id='mobile-number' />
<input type='text' id='copy' readonly/>
Try this:( If i really understand your problem )
jQuery(document).on('change', '#mobile-number', function() {
// some other code
});
for type event:
jQuery(document).on('keyup', '#mobile-number', function() {
// some other code
});
You should provide your selector to the .on function:
$(document).on('change', '#mobile-number', function() {
// some other code
});
Using the new input="color" element within Chrome triggers a new popup dialog:
I would like to know if there is an event handler that fires as soon as the value in this preview window changes and not only after clicking on "OK"
jQuery('#colorinput').on('change', function() { // fires only after clicking OK
jQuery('#main').css('background-color', jQuery(this).val());
});
See http://jsfiddle.net/Riesling/PEGS4/
What you are looking for is the input event.
Your modified fiddle should now work in all (decent) browsers:
$('#colorinput').on('input', function() { ... } )
You really want input event per HTML spec.
Nothing guarantees change event to fire before the input element has lost focus.
"The input event fires whenever the user has modified the data of the control. The change event fires when the value is committed, if that makes sense for the control, or else when the control loses focus. "
To get the value of color input, you should use the event attribute onchangeprovided in w3school
<input name="eventColor" type="color" onchange="getColorVal(eventColor.value)"/>
and define a function that handle the event
function getColorVal(colorValue){
alert(colorValue);
}
I am using Jquery to set some flag whenever input elements value get changed.
I wrote a simple script which is working fine but I observed that the function get called only when control get out of the input element.If user types something and keeps the control in the same input then function is not called.
I want to execute the function whenever input elements value get changed irrespective of where the control is.
Here is my code
$("input,textarea").live('change',function ()
{
// Set flag
});
I am using live() to bind change() method to dynamicaly added input elements.
~ Ajinkya.
Semantically, the change event is triggered when the element loses focus. That's when its value property is updated.
If you want to work whenever a key is pressed, use the keypress event:
$("input,textarea").live('keypress',function ()
{
// Set flag
});
Use keyup/keydown event instead of change:
$("input,textarea").live('keyup',function ()
{
// Set flag
});
The 'change' event works as lonesomeday said.
But if you want to set your flag whenever something occurs, you can create your own event.
For instance, with your custom event, you can set your flag if the user change the field, press a key, focus on the element or anything you want.
To know more about that: http://brandonaaron.net/blog/2009/06/4/jquery-edge-new-special-event-hooks
When using jquery .change on an input the event will only be fired when the input loses focus
In my case, I need to make a call to the service (check if value is valid) as soon as the input value is changed. How could I accomplish this?
UPDATED for clarification and example
examples: http://jsfiddle.net/pxfunc/5kpeJ/
Method 1. input event
In modern browsers use the input event. This event will fire when the user is typing into a text field, pasting, undoing, basically anytime the value changed from one value to another.
In jQuery do that like this
$('#someInput').bind('input', function() {
$(this).val() // get the current value of the input field.
});
starting with jQuery 1.7, replace bind with on:
$('#someInput').on('input', function() {
$(this).val() // get the current value of the input field.
});
Method 2. keyup event
For older browsers use the keyup event (this will fire once a key on the keyboard has been released, this event can give a sort of false positive because when "w" is released the input value is changed and the keyup event fires, but also when the "shift" key is released the keyup event fires but no change has been made to the input.). Also this method doesn't fire if the user right-clicks and pastes from the context menu:
$('#someInput').keyup(function() {
$(this).val() // get the current value of the input field.
});
Method 3. Timer (setInterval or setTimeout)
To get around the limitations of keyup you can set a timer to periodically check the value of the input to determine a change in value. You can use setInterval or setTimeout to do this timer check. See the marked answer on this SO question: jQuery textbox change event or see the fiddle for a working example using focus and blur events to start and stop the timer for a specific input field
If you've got HTML5:
oninput (fires only when a change actually happens, but does so immediately)
Otherwise you need to check for all these events which might indicate a change to the input element's value:
onchange
onkeyup (not keydown or keypress as the input's value won't have the new keystroke in it yet)
onpaste (when supported)
and maybe:
onmouseup (I'm not sure about this one)
With HTML5 and without using jQuery, you can using the input event:
var input = document.querySelector('input');
input.addEventListener('input', function()
{
console.log('input changed to: ', input.value);
});
This will fire each time the input's text changes.
Supported in IE9+ and other browsers.
Try it live in a jsFiddle here.
As others already suggested, the solution in your case is to sniff multiple events.
Plugins doing this job often listen for the following events:
$input.on('change keydown keypress keyup mousedown click mouseup', handler);
If you think it may fit, you can add focus, blur and other events too.
I suggest not to exceed in the events to listen, as it loads in the browser memory further procedures to execute according to the user's behaviour.
Attention: note that changing the value of an input element with JavaScript (e.g. through the jQuery .val() method) won't fire any of the events above.
(Reference: https://api.jquery.com/change/).
// .blur is triggered when element loses focus
$('#target').blur(function() {
alert($(this).val());
});
// To trigger manually use:
$('#target').blur();
If you want the event to be fired whenever something is changed within the element then you could use the keyup event.
There are jQuery events like keyup and keypress which you can use with input HTML Elements.
You could additionally use the blur() event.
This covers every change to an input using jQuery 1.7 and above:
$(".inputElement").on("input", null, null, callbackFunction);
I have an ASP.NET datepicker control (no source available ) which produces an image element, which when clicked shows a calendar. I want to disable or enable on demand the image through JavaScript. When I added the 'disabled' attribute to the img element, some script in the page always goes in a busy state and the page never finishes rendering. My guess the disabled attribute is causing a conflict in some way.
My next attempt now is to disable the custom click event which the ASP.NET control adds unoptrusively. How do I disable the click event? How do I re-enable it so that the img works back as normal. I am also using jQuery 1.4.
var $img = $('img#yourid'),
handler = $img.get(0).onclick; // previous click handler
// unbind
$img.unbind('click').click(function(){
alert('new click');
});
// rebind
$img.unbind('click').click(handler);
You might need to check other events also (mousedown mouseup etc).
I have an example here, which swaps all of the click events to a hidden div, and then back again to re-enable:
http://jsfiddle.net/Jbs9V/
There might be some shortcuts to do this, but this works. Likewise, you could store the click handlers in a global var and load them from that:
http://jsfiddle.net/8ZKJR/
I think that the bug could be happen because the datepicker uses the text control to do its stuff, but if the control is disabled, datepicker cannot continue, but you can use other attribute to do almost the same thing, use the attribute readonly in your tag:
readonly="readonly"
you can use the attribute readonly in your html input.
hope this helps.
You can use unbind() to remove any custom event handler using jquery.