如果使用jQuery val()或JavaScript更改值,则输入事件不起作用 [英] Input event not working if value is changed with jQuery val() or JavaScript
问题描述
如果我以编程方式更改输入字段的值,则输入
和更改
事件不会触发。例如,我有这种情况:
If I change the value of an input field programmatically, the input
and change
events are not firing. For example, I have this scenario:
var $input = $('#myinput');
$input.on('input', function() {
// Do this when value changes
alert($input.val());
});
$('#change').click(function() {
// Change the value
$input.val($input.val() + 'x');
});
<input id="myinput" type="text" />
<button id="change">Change value</button>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
问题:当我输入文本字段时触发事件,但是当我按按钮。有没有办法通过某种事件或其他方式实现这一点,而无需手动执行?
The problem: The event is triggered when I type in the textfield, but not when I press the button. Is there a way to achieve this with some kind of event or otherwise without having to do it manually?
我不想做的事情:我可以通过我的所有代码添加一个触发器
或函数调用无处不在手动,但这不是我正在寻找。
What I don't want to do: I could go through all my code to add a trigger
or function call everywhere manually, but that's not what I'm looking for.
为什么:喜欢这样做是自动的,我有很多输入字段和很多不同的地方,我以编程方式更改这些输入。如果有任何方式在我的代码中的任何地方更改任何输入时,如果有办法自动触发事件,会节省大量时间。
Why: The main reason I would like to do this automatically is that I have a lot of input fields and a lot of different places where I change these inputs programmatically. It would save me a lot of time if there was a way to fire the event automatically when any input is changed anywhere in my code.
推荐答案
简单解决方案:
触发器输入
在您调用 val()
之后:
$input.trigger("input");
var $input = $("#myinput");
$input.on('input', function() {
alert($(this).val());
});
$('#change').click(function() {
// Change the value and trigger input
$input.val($input.val() + 'x').trigger("input");
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<input id="myinput" type="text" />
<button id="change">Change value</button>
具体解决方案:
如上所述,您不想手动触发输入
。此解决方案通过覆盖 val()
自动触发事件。
As mentioned you don't want to trigger input
manually. This solution triggers the event automatically by overriding val()
.
只需将其添加到您的代码中:
Just add this to your code:
(function ($) {
var originalVal = $.fn.val;
$.fn.val = function (value) {
var res = originalVal.apply(this, arguments);
if (this.is('input:text') && arguments.length >= 1) {
// this is input type=text setter
this.trigger("input");
}
return res;
};
})(jQuery);
请参阅 JSFiddle Demo
PS
通知 this.is('input:text')
中的条件。如果要触发更多类型的事件,请将其添加到条件。
Notice this.is('input:text')
in the condition. If you want to trigger the event for more types, add them to the condition.
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