javascript onclick() 和 onClientClick() 的区别？
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Difference between onclick() and onClientClick()?
提问by Sangram Nandkhile
If I use both onclick()and onClientClick()can I make sure that server side will be called only after client side function returns TRUE or vice versa?
如果我同时使用两者onclick()，onClientClick()我能否确保只有在客户端函数返回 TRUE 后才会调用服务器端，反之亦然？
For example:
例如：
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<%@ Import Namespace="System.Xml" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<%
protected void save_n_display(object sender, EventArgs e)
{
// This must be called when validate() returns true...
}
%>
<asp:Button ID="Button1" OnClientClick="validate()" onClick="save_n _display" "Text="Check" runat="server" />
<script type="text/javascript" language="javascript">
function validate() // client side Validation is done
{
}
</script>
So can I use onclick()and onClientClick()or do I need something different for this?
I even tried passing variables from javascript to asp functions so when validate returns true then save_n _display will be called.
所以，我可以使用onclick()和onClientClick()或是否需要这个东西有什么不同？我什至尝试将变量从 javascript 传递到 asp 函数，因此当验证返回 true 时，将调用 save_n _display。
回答by spinon
However you get your client side click event registered it doesn't matter. Though if you are using a server control then you do want to use onclientclick. But the key is that you want to use return Validate(). Then in your validate method you return a true or false value depending on whether it validated or not.
但是，您注册了客户端单击事件并不重要。但是，如果您使用的是服务器控件，那么您确实希望使用 onclientclick。但关键是你要使用return Validate()。然后在您的验证方法中，您根据它是否经过验证返回真值或假值。
EDIT: So make onclientclick look like this:
编辑：所以让 onclientclick 看起来像这样：
onclientclick="return Validate();"
Then in the validate function:
然后在验证函数中：
function Validate()
{
return true;
}
回答by The Mirage
I have to go find the example...but I just did the on-click event. In the codebehind, I ran my ServerSide code...or I would register a script on the page to call the JS validation and then run the codebehind code.
我必须去找那个例子……但我只是做了点击事件。在代码隐藏中，我运行了我的服务器端代码……或者我会在页面上注册一个脚本来调用 JS 验证，然后运行代码隐藏代码。
Learn about RegisterStartupScript
OnClick="MyCodeBehindMethod()"
Then, in the codebehind have:
然后，在代码隐藏中有：
//Verify and validate conditions
string script1="<script language=JavaScript>"
script1 += "Validate();"
script1 += "</script>"
Page.RegisterStartupScript("clientscript",script1);
