Trigger a jQuery UI slider event

问题

How can I trigger a change event on a jQuery UI slider?

I thought it would be

$('#slider').trigger('slidechange');

but that does nothing.

Full example script follows:

<link href="http://jqueryui.com/latest/themes/base/ui.all.css" rel="stylesheet" type="text/css"> 

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.js" type="text/javascript"></script> 
<script src="http://jqueryui.com/latest/ui/ui.core.js" type="text/javascript"></script> 
<script src="http://jqueryui.com/latest/ui/ui.slider.js" type="text/javascript"></script> 

<body>

<div id="slider"></div>

<script type="text/javascript">

$().ready(function()
{
    $('#slider').slider({change: function() { alert(0); }});

    // These don't work
    $('#slider').trigger('change');
    $('#slider').trigger('slidechange');
});
</script>

I would expect this to alert "0" when the page loads

回答1:

Try

$slider = $('#slider');
$slider.slider('option', 'change').call($slider);

Not ideal but gets you working!

回答2:

I know this is way past the post date, but I wanted to post to provide this solution to anyone that stumbles upon this post.

You can accomplish event triggering by doing something along the lines of:

//TO DEFINE SLIDER AND EVENTS
$('#slider').slider().bind('slidechange',function(event,ui){...});

//TO TRIGGER EVENT
$('#slider').trigger('slidechange');

Unfortunately you cannot define the functions as options within the init object, however, I think it ends up looking cleaner and is more straight forward and correct than the other answer using the call method (i.e. it does use the event system).

And yes, the callbacks you define here will be called on normal operation (changing the position of the slider in this case) as it normally would. Just make sure you use the correct event type names from the UI documentation.

If you want to add multiple events at once, remember you can provide an object to bind using the event names as keys:

//TO DEFINE SLIDER AND EVENTS
$('#slider').slider().bind({
    slidestart  : function(event,ui) {...},
    slidechange : function(event,ui) {...},
    slidestop   : function(event,ui) {...},
});

//TO TRIGGER EVENTS
$('#slider').trigger('slidestart');
$('#slider').trigger('slidechange');
$('#slider').trigger('slidestop');

This is noted in the documentation, although, it is not very clear. Took me developing a couple plugins on my own to really understand the UI event system.

Enjoy

回答3:

A good approach is simply to change the value of the slider. The slider's own change method should then respond to the change of value. For instance:

var newValue=5;
$('#slider').slider("value", newValue);

回答4:

Yet another way, which is handy for UI widgets like autocomplete, is to access the event directly via the data method. JQuery stores all of its event hookup info using .data("events"), so if you use that property you can access the events directly. On some UI components (eg. autocomplete) the events aren't even attached to the main element, they're attached to the UI object itself. Luckily, that UI object is also available in data.

So, without further ado, here's how you'd invoke the autocomplete's select event:

$("#autoComplete").data("autocomplete").menu.select()

Or, (getting back to sliders) to trigger a slider's change:

$("#slider").data("slider")._change()

Trigger is still the best way of course, since it actual utilizes the event system, but on the more complex widgets where "$(elem).trigger" won't be enough, this approach is handy.

* EDIT *

Just figured out that you actually can "trigger" the event properly with this method, using the widget's "secret" _trigger property. For example:

$("#autoComplete").data("autocomplete")._trigger("select", fakeEvent, fakeItem)

Hope this helps someone.

回答5:

This maybe resurrecting an old thread, but was just having a similar experience. The solution that I came up with (because the thought of calling slider(...) multiple times was not appealing):

$slider.slider('option', 'slide').call($slider, event, ui);

With $slider being bound to the $(selector).slider(...) initialization.

回答6:

Wanted to add a comment on Joey Yore's answer -

I think it's better the other way round

$('#slider').bind({
    slidestart  : function(event,ui) {...},
    slidechange : function(event,ui) {...},
    slidestop   : function(event,ui) {...},
    slidecreate : function(event,ui) {...}
}).slider();

Otherwise some events (namely, 'slidecreate') will be ignored

回答7:

I found it easier to use the 'create' method to call the slide or stop function. Eg, for a slider with a min/max range:

$('#height').slider({
        ...
        create: function(event, slider){ $( "#height" ).slider( "option", "values", [1100, 1500] ); handleHeightSlide('slide', $( "#height" ));},
        ...
    });

回答8:

As documentation;

change( event, ui ) Triggered after the user slides a handle, if the value has changed; or if the value is changed programmatically via the value method.

Just setup bind change event

$(".selector").slider({change: function(event, ui) {console.log('It Works!'}});

and set value

$(".selector").slider('value',0);

回答9:

If you bind to to the slider's change event like that:

$('#slider').change(function() {
    alert('action');
});

Then you can trigger it like:

$('#slider').trigger('change');

The solution below mentioned by Joey Yore works too, but the downside is that slidechange event is not fired (from my experience) when user changes your slider from UI.

//TO DEFINE SLIDER AND EVENTS
$('#slider').slider().bind('slidechange',function(event,ui){...});

//TO TRIGGER EVENT
$('#slider').trigger('slidechange');

回答10:

I Used both slidechanged and slide, slide triggers when drag the point, slidechanged triggers after release the mouse button (just like click event)

var slider1 = $("#slider1").slider({ min: 1, max: 6 });
//option 1
slider1.on("slide", function (e, ui) {

});
//Option 2
slider1.on("slidechanged", function (e, ui) {

});

回答11:

I've hit this problem recently, and used Felipe Castro's comment-solution, with a necessary change to set the context right:

$slider.slider('option', 'slide').apply($slider, [null, {value: $slider.slider('value')}])

回答12:

The jQueryUI Slider documentation gives the following example for triggering an event:

$( ".selector" ).slider({
    change: function( event, ui ) {}
});

and for the event trigger:

$( ".selector" ).on( "slidechange", function( event, ui ) {} );

this didn't work for me!

All I had to do to get it working was to change "slidechange" to "change".

$( ".selector" ).on( "change", function( event, ui ) {} );

Hope this helps the future generations that stumbleupon this problem.

来源：https://stackoverflow.com/questions/1288824/trigger-a-jquery-ui-slider-event

标签

jquery

events

jquery-ui-slider