如何使用 __doPostBack() [英] How to use __doPostBack()

问题描述

我正在尝试使用 __doPostBack() 在 ASP.NET 中创建异步回发，但我不知道该怎么做.我想使用原生 JavaScript.

I'm trying to create an asyncrhonous postback in ASP.NET using __doPostBack(), but I have no idea how to do it. I want to use vanilla JavaScript.

像按钮点击这样简单的事情会导致 __doPostBack() 事件触发.我只是想了解该机制的工作原理.

Something simple like a button click can cause the __doPostBack() event to fire. I'm just trying to learn how the mechanism works.

推荐答案

您可以在 Web 表单中使用名为 btnSave 的按钮尝试此操作，例如:

You can try this in your web form with a button called btnSave for example:

<input type="button" id="btnSave" onclick="javascript:SaveWithParameter('Hello Michael')" value="click me"/>

<script type="text/javascript">
function SaveWithParameter(parameter)
{
  __doPostBack('btnSave', parameter)
}
</script>

在你的代码后面添加类似这样的东西来读取值并对其进行操作:

And in your code behind add something like this to read the value and operate upon it:

public void Page_Load(object sender, EventArgs e)
{
  string parameter = Request["__EVENTARGUMENT"]; // parameter
  // Request["__EVENTTARGET"]; // btnSave
}

尝试一下，让我们知道它是否适合您.

Give that a try and let us know if that worked for you.

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