将标签值放入textboxe [英] Putting label value into textboxe
本文介绍了将标签值放入textboxe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
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<script type = "text/javascript">
function labelToText(lblConversionFactor, txtConversionFactor) {
document.getElementById(txtConversionFactor).value =
document.getElementById(lblConversionFactor).innerHTML;
}
document.getElementById("L2T").addEventListener("click", function () {
labelToText( "Txt","Lbl");
});
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Label ID="Lbl" runat="server" Text="UserName"></asp:Label>
<asp:TextBox ID="Txt" runat="server"></asp:TextBox>
</div>
</form>
</body>
</html>
我尝试过使用
I have tried using
protected void Txt_TextChanged1(object sender, EventArgs e)
{
Lbl.Text = Txt.Text;
}
但这也不起作用
But this was also not working
推荐答案
当然，有错误：
1.在没有L2T的地方，你附加了一个点击事件监听器，它无处可寻。我假设它是一个按钮。
2.在创建L2T之前声明了addEventListener，因为它是在加载假想的L2T之前放置的。
3 。不要在asp.net中使用静态id，因为运行时间id可能不同，请参考： ASP.NET 4.0客户端ID功能 [ ^ ]
让我们看看正确的版本：
Definitely, there are errors:
1. Where is no "L2T", you are attaching a click event listener to it and it is no where to be found. I assume it is a button.
2. The addEventListener was declared before the L2T was created as it is placed before the loading of supposedly a L2T in the body.
3. Do not use static id in asp.net as the run time id could be different, refer: ASP.NET 4.0 Client ID Feature[^]
Let's see the correct version:
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Label ID="Lbl" runat="server" Text="UserName"></asp:Label>
<asp:TextBox ID="Txt" runat="server"></asp:TextBox>
<asp:Button ID="L2T" runat="server" Text="Button" />
</div>
</form>
<script type = "text/javascript">
function labelToText(lblConversionFactor, txtConversionFactor) {
document.getElementById(txtConversionFactor).value =
document.getElementById(lblConversionFactor).innerHTML;
}
document.getElementById("L2T").addEventListener("click", function () {
labelToText("<%= Lbl.ClientID %>", "<%= Txt.ClientID %>");
});
</script>
</body>
</html>
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
++++++++++[Round 2}+++++++++++++++
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Label ID="Lbl" runat="server" Text="UserName"></asp:Label>
<asp:TextBox ID="Txt" runat="server"></asp:TextBox>
</div>
</form>
<script type = "text/javascript">
function labelToText(lblConversionFactor, txtConversionFactor) {
document.getElementById(txtConversionFactor).value =
document.getElementById(lblConversionFactor).innerHTML;
}
labelToText("<%= Lbl.ClientID %>", "<%= Txt.ClientID %>");
</script>
</body>
</html>
您已在 JavaScript 以及服务器端编写了许多事件的。但是没有任何东西在调用这些事件。
You have written many events in JavaScript as well as in Server side. But nothing is invoking these events.
document.getElementById("L2T")没有ID L2T 。
Txt_TextChanged1 未在标记中定义，那么它将如何调用该事件？没有什么可以自动工作，你必须告诉他们这样做。
There is no such element with ID "L2T".
Txt_TextChanged1 is not defined in the markup, so how it will invoke the event? Nothing work automatically, you have to tell them to do.
你错过了一些改变。
替换它 -
You have missed to make few changes.
Replace this-
<asp:textbox id="Txt" runat="server" ></asp:textbox>
with
with
<asp:textbox id="Txt" runat="server" autopostback="True" ontextchanged="Txt_TextChanged1" ></asp:textbox> < br $>
希望，它有帮助：）
Hope, it helps :)
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