从 Javascript 调用代码隐藏-C#/.NET问题

Calling Code-behind from Javascript(从 Javascript 调用代码隐藏)

本文介绍了从 Javascript 调用代码隐藏的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

点击一个按钮，我调用了一个 JavaScript 函数.获得值后，我需要从代码隐藏中获得的值中执行一些操作.我应该如何调用代码隐藏?

On the click of a button, I call a JavaScript function. After getting the value, I need to perform some stuff from the value obtained in the code-behind. How should I call code-behind?

我的aspx:

function openWindow(page) {
  var getval = window.showModalDialog(page);
  document.getElementById("<%= TxtInput.ClientID %>").value = getval; 
  //After this I need to perform stuff 'Upload(TxtInput.value)' into database from the code-behind
}

调用函数的按钮设置如下:

The button calling the function is set up in the following manner:

<button class="doActionButton" id="btnSelectImage" runat="server" onclick="openWindow('../rcwksheet/popups/uploader.htm')">Select Image</button>

我想要的代码(VB):

My desired code behind (VB):

Public Sub btnSaveImage_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSelectImage.ServerClick
  Dim inputFile As String = Me.TxtInput.Value
  //do more stuff here
End Sub

所以:

有没有办法从 JavaScript 调用代码隐藏?
我能否以某种方式使用按钮的onclick"属性先转到 JavaScript，然后再转到代码隐藏?
触发 TxtInput.Value 的代码隐藏调用onchange"?

推荐答案

是的，有办法.

首先，在TxtInput中设置好返回值后，可以使用javascript提交表单.

first, you can use javascript to submit the form after your return value is set in TxtInput.

function openWindow(page) {
  var getval = window.showModalDialog(page);
  document.getElementById("<%= TxtInput.ClientID %>").value = getval; 
  document.forms[0].submit();
}

然后在你的代码后面，你可以在页面加载事件中处理 TxtInput 的值.

then in your code behind, you can handle TxtInput's value in page load event.

protected void Page_Load(object sender, EventArgs e)
{
    if (Page.IsPostBack)
    {
        if (this.Input.Value != string.Empty)
        {
            this.Input.Value += "blah";
        }
    }
}

注意:您可能需要识别导致回发的控件

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