ASP.NET VB.NET 中的动态 ID 名称

发布于 2024-10-19 06:57:04 字数 389 浏览 0 评论 0 原文

我的 ASP 页面中有大约 20 个 asp:labels，全部带有 ID="lbl#"，其中 # 的范围从 0 到 22。我想动态更改它们的内容说。虽然我可以

lbl1.Text = "Text goes here"

为所有 23 个内容编写内容，但我想知道是否有办法循环遍历所有内容并更改其文本。

我想用所有标签创建一个数组，然后执行 For Each 循环，但在更改其之前，我还必须使用 IsNothing 检查该元素是否存在文本，所以我被困在那里。

如果有人可以帮助我，我真的很感激！

非常感谢您的帮助！

原文

I have about 20 asp:labels in my ASP page, all with ID="lbl#", where # ranges from 0 to 22. I want to dynamically change what they say. While I could write

lbl1.Text = "Text goes here"

for all 23 of them, I'd like to know if there is a way to loop through all of them and change their text.

I thought of creating an array with all my labels, and then just do a For Each loop, but I also have to check if the element exists with IsNothing before I change its text, so I got stuck there.

If anyone can help me, I'd really really appreciate it!

Thank you so so much for your help!!

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饮湿 2024-10-26 06:57:04

您可以使用 Page_Load 方法中的 System.Web.UI.Page.FindControl() 方法动态查找页面上的控件：

Dim startIndex As Integer = 0
Dim stopIndex As Integer = 22

For index = startIndex To stopIndex
    Dim myLabel As Label = TryCast(FindControl("lbl" + index), Label)

    If myLabel Is Nothing Then
        Continue For
    End If

    myLabel.Text = "Text goes here"
Next

You can dynamically look up controls on the page by using the System.Web.UI.Page.FindControl() method in your Page_Load method:

Dim startIndex As Integer = 0
Dim stopIndex As Integer = 22

For index = startIndex To stopIndex
    Dim myLabel As Label = TryCast(FindControl("lbl" + index), Label)

    If myLabel Is Nothing Then
        Continue For
    End If

    myLabel.Text = "Text goes here"
Next

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剪不断理还乱 2024-10-26 06:57:04

像这样的东西可能会起作用，但你可能需要调整它（它来自记忆，所以它在语法上并不完全100%正确）

For Each _ctl as Control In Me.Controls()
  If (TypeOf(_ctl) Is Label) = False Then
    Continue For
  End If

  'add additional filter conditions'

  DirectCast(_ctl, Label).Text = "Text Goes Here"
Next

你也可以在客户端使用 jQuery 选择器。

Something like this may work, but you would likely need to tweak it (its from memory, so its not exactly 100% syntactically correct)

For Each _ctl as Control In Me.Controls()
  If (TypeOf(_ctl) Is Label) = False Then
    Continue For
  End If

  'add additional filter conditions'

  DirectCast(_ctl, Label).Text = "Text Goes Here"
Next

You can also do something similar on the client side using jQuery selectors.

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