从代码后面(c#)设置javascript变量的值
本文关键字:javascript 设置 变量 代码 | 更新日期: 2023-09-27 18:12:52
我理解客户端脚本和服务器端脚本之间的区别。我有一个javascript函数和变量在我的MasterPage
:
<script language="JavaScript" type="text/javascript">
var needToConfirm = false;
window.onbeforeunload = confirmExit;
function confirmExit()
{
if (needToConfirm)
{
needToConfirm = false;
return "Currently in edit mode. If you leave the page now then you will lose unsaved changes."
}
}
</script>
考虑到我的ASP。. NET(客户端)我可以将我的needToConfirm
变量的值更改为true
onClientClick
,但默认情况下它是false。下面是一个例子。
<asp:Button ID="btnEdit" runat="server" Text=" Edit " onclick="btnEdit_Click" OnClientClick="needToConfirm = true;" />
现在的问题是,当在c#(服务器端)上,我必须将needToConfirm
在if-statement
下设置为true,但不一定在Page_Load
上设置:
private void SetDefault()
if (Session[def.ID_CUST] != null)
{
//I want to change the variable value here
}
}
谢谢。
我使用的是。net 2.0 Classic和WebForms
后面的代码:
ScriptManager.RegisterStartupScript(this, this.GetType(), "", "urFunction('urValHere');", true);
客户端:
function urFunction(urParam) {
//do what u want here
//use urParam
}
您可以使用隐藏输入,然后从服务器端将此输入设置为true
或false
。
客户端:
<input type="hidden" id="hdnConfirm" runat="server" value="false"/>
然后在服务器端:
if (Session[def.ID_CUST] != null)
{
//I want to change the variable value here
hdnConfirm.Value = "true";
}
然后在客户端:
var needToConfirm = $('#hdnConfirm').val();
如果我理解正确的话,您可以像在http://msdn.microsoft.com/en-us/library/z9h4dk8y.aspx的示例中那样注册客户端脚本。
ClientScriptManager cs = Page.ClientScript;
if (!cs.IsStartupScriptRegistered(this.GetType(), "EditMode")) {
cs.RegisterStartupScript(this.GetType(), "EditMode", "needToConfirm = true;", true);
}
这将写一个脚本到在Javascript中设置needToConfirm
值的页面
基于你的更新说它是。net 2.0,这是你如何设置一个javascript变量:
Page.RegisterStartupScript("SetVar", "var needToConfirm = true;");
http://msdn.microsoft.com/en-us/library/system.web.ui.page.registerstartupscript (v = vs.80) . aspx
仅供参考。下面是做类似事情的4.5种方法:
// Define the name and type of the client scripts on the page.
const String csname1 = "MyScriptName";
Type cstype = this.GetType();
// Get a ClientScriptManager reference from the Page class.
ClientScriptManager cs = Page.ClientScript;
// Check to see if the startup script is already registered.
if (!cs.IsStartupScriptRegistered(cstype, csname1))
{
StringBuilder cstext1 = new StringBuilder();
cstext1.Append("<script> var myVariable = true; </");
cstext1.Append("script>");
cs.RegisterStartupScript(cstype, csname1, cstext1.ToString());
}
http://msdn.microsoft.com/en-us/library/system.web.ui.clientscriptmanager.registerstartupscript (v = vs.110) . aspx
也许这有帮助?
<script type="text/javascript">
function test(confirm){
var needToConfirm = confirm;
window.onbeforeunload = confirmExit;
function confirmExit() {
if (needToConfirm) {
needToConfirm = false;
return "Currently in edit mode. If you leave the page now then you will lose unsaved changes."
}
}
}
</script>
<asp:Button ID="btnEdit" runat="server" Text="Edit" onclick="btnEdit_Click" OnClientClick="javascript:test(true);" />