Javascript：“onchange”事件不适用于“值”改变“文本输入”宾语 [英] Javascript: "onchange" event does not work with "value" change in "text input" object

问题描述

我有一个javascript 输入对象，其中 type =text随附 onchange 由（相关行）创建的事件：

I have a javascript input object with type="text" coming along with an onchange event which is created by (related lines):

var id_box = document.createElement('input');
id_box.id = 'id_box';
id_box.type = 'text';
id_box.onchange = function()
{
    alert("Changed!");
}

更改此值在我使用的输入字段中：

For changing this value in this input field I use:

var a = document.createElement('a');
a.innerHTML = "A";
a.onclick = function()
{
    document.getElementById('id_box').value = 'A';
}

onchange 事件仅通过键盘输入改变值，但不能通过上述功能改变值。有没有办法让这个有效？

The onchange event works only changing value by keyboard typing but not for changing value by above function. Is there any way to make this works?

请看一下： http://jsfiddle.net/zCMdV/7/

推荐答案

你是什么浏览器？使用？

What browser are you using?

我做了这个例子，这对我有用......微妙的变化是我在将它附加到div元素之前将事件添加到输入。

I have made this example, which works for me... the subtle change is that I add the event to the input before I append it to the div element.

<div id="test"></div>
<script type="text/javascript">
    var id_box = document.createElement('input');
    id_box.type = 'text';
    id_box.onchange = function()
    {
        alert("Changed!");
    }
    document.getElementById("test").appendChild(id_box);

</script>

在JS Fiddle上看到它： http://jsfiddle.net/Sohnee/zCMdV/

See it in action on JS Fiddle: http://jsfiddle.net/Sohnee/zCMdV/

更新：

如果您要自动更改值，您可以执行同样的操作来触发更改事件......

If you are going to automate the changing of the value, you can do the same to trigger the change event...

http://jsfiddle.net/Sohnee/zCMdV/10/

document.getElementById('id_box').onchange();

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