当输入值以编程方式更改时触发更改事件？

我的表格中有一个输入。

<input type="text" id="changeProgramatic" onchange="return ChangeValue(this);"/>

如果我使用另一个 JavaScript 函数更改这个 textBox (changeProgramatic)中的值，它不会触发更改事件。(注意: 我将‘ this’传递到方法中)

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最佳答案

You are using jQuery, right? Separate JavaScript from HTML.

You can use trigger or triggerHandler.

var $myInput = $('#changeProgramatic').on('change', ChangeValue);


var anotherFunction = function() {
$myInput.val('Another value');
$myInput.trigger('change');
};
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Vanilla JS solution:

var el = document.getElementById('changeProgramatic');
el.value = 'New Value'
el.dispatchEvent(new Event('change'));

Note that dispatchEvent doesn't work in old IE (see: caniuse). So you should probably only use it on internal websites (not on websites having wide audience).

So as of 2019 you just might want to make sure your customers/audience don't use Windows XP (yes, some still do in 2019). You might want to use conditional comments to warn customers that you don't support old IE (pre IE 11 in this case), but note that conditional comments only work until IE9 (don't work in IE10). So you might want to use feature detection instead. E.g. you could do an early check for: typeof document.body.dispatchEvent === 'function'.

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If someone is using react, following will be useful:

https://stackoverflow.com/a/62111884/1015678

const valueSetter = Object.getOwnPropertyDescriptor(this.textInputRef, 'value').set;
const prototype = Object.getPrototypeOf(this.textInputRef);
const prototypeValueSetter = Object.getOwnPropertyDescriptor(prototype, 'value').set;
if (valueSetter && valueSetter !== prototypeValueSetter) {
prototypeValueSetter.call(this.textInputRef, 'new value');
} else {
valueSetter.call(this.textInputRef, 'new value');
}
this.textInputRef.dispatchEvent(new Event('input', { bubbles: true }));
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When changing the value programmatically, you need to call the input event, not change event.

Note: The input event is fired every time the value of the element changes. This is unlike the change event, which only fires when the value is committed, such as by pressing the enter key, selecting a value from a list of options, and the like.

const el = document.getElementById('changeProgramatic');
el.value = 'New Value'
el.dispatchEvent(new Event('input', { 'bubbles': true }));

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