我设置了带有javascript的字段值，未触发onchange.替代解决方案? [英] I set field value w/ javascript, onchange not triggered. Alternative solution?

问题描述

我已经阅读了一些解决方案，但都不是轻松的，所以我认为现在可能存在一些现代的解决方案来解决这个问题.无论如何，应该都这样做，因为问题已经存在了一段时间.在最近的jQuery更新中有一些功能吗?

I have read some solutions to this, none of which are hassle free, so I thought maybe some modern solution now exist to remedy this. It should anyways, since the problem has been around for a while. Something in the more recent jQuery updates perhaaps?

我将表单字段设置如下:

I set my form field like this:

parent.window.document.getElementById(parent.window.imageInputField).value = '{{ path }}'+image;

并且我有一个像这样的onchange事件，我想在上面的字段更新时触发.

and I have an onchange event like this that I would like to fire upon my field update as of above.

$('#data_1').change(function(){
img = "url(" + $('#data_1').val() + ")"
$('#slide_bg').css("backgroundImage", img );
});

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更新

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UPDATE

因此此代码可以正常工作:

so this code works fine:

alert( $('#'+parent.window.imageInputField, window.parent.document).val() );

这什么都不做，没有错误或什么都不做

while this doesn't do anything, no error or nothing

$('#'+parent.window.imageInputField, window.parent.document).change();

更改事件在此处定义

$('#data_1').change(function(){
alert('change event called');
img = "url(" + $('#data_1').val() + ")"
$('#slide_bg').css("backgroundImage", img );
});

这很完美:

<input type='button' value='Uppdatera förhandsgr.' onclick="$('#data_1').change()" />

我只想触发此按钮的功能，但是通过代码...有人看到我出了错吗?

All I want is to trigger what this button does, but by code... anyone see where I went wrong?

推荐答案

，您需要使用代码来触发变更处理程序.使用脚本更新值不会触发change事件

you need to trigger the change handler with your code. Updating a value with script will not trigger change event

parent.window.document.getElementById(parent.window.imageInputField).value = '{{ path }}'+image;
$('#data_1').change()

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