在没有用户交互的情况下触发的Javascript事件? [英] Javascript event that fires without user interaction?

问题描述

我的表单上的文本框可能会更改，具体取决于在各种下拉列表中选择的内容.

A textbox on my form may change depending on what's selected in various drop down lists.

当文本框值更改时，是否可以调用javascript函数?

Is there a way to call a javascript function when the textbox value changes?

尝试了onchange事件，但这似乎仅在用户手动更改文本框值的情况下有效.

Tried onchange event but this only seems to work if a user manually changes the textbox value.

干杯

Breandán

推荐答案

否，对表单元素进行JavaScript触发的更改不会触发事件.如果这样做，将导致各种递归无限循环.

No, javascript-triggered changes to form elements don't trigger events. If they did, this would cause all sorts of recursive infinite loops.

简单的解决方案是每当更改文本框的值时手动调用onchange函数，但是您也可以使用某种包装函数.作为一个非常基本的示例:

The simple solution is to call your onchange function manually whenever you change the value of the textbox, however you could also use some kind of wrapper function. As a very basic example:

function updateTextField(new_text) {
  text_field.value = new_text;
  text_field.onchange();
}

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