問題描述

點擊一個按鈕，我調(diào)用了一個 JavaScript 函數(shù).獲得值后，我需要從代碼隱藏中獲得的值中執(zhí)行一些操作.我應該如何調(diào)用代碼隱藏?

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
}

調(diào)用函數(shù)的按鈕設(shè)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>

我想要的代碼(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:

1. 有沒有辦法從 JavaScript 調(diào)用代碼隱藏?
2. 我能否以某種方式使用按鈕的onclick"屬性先轉(zhuǎn)到 JavaScript，然后再轉(zhuǎn)到代碼隱藏?
3. 觸發(fā) TxtInput.Value 的代碼隱藏調(diào)用onchange"?

推薦答案

是的，有辦法.

首先，在TxtInput中設(shè)置好返回值后，可以使用javascript提交表單.

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();
}

然后在你的代碼后面，你可以在頁面加載事件中處理 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:您可能需要識別導致回發(fā)的控件

這篇關(guān)于從 Javascript 調(diào)用代碼隱藏的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網(wǎng)！