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New Message on BDOTNET
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From: rajesh_mr
Message 4 in Discussion
Page class has the following methods: Page.RegisterStartupScript - adds
JavaScript to the web form right before the ending </form> tag
Page.RegisterClientScriptBlock - adds JavaScript to the web form, right after
the <form runat="server"> declaration Page.IsStartupScriptRegistered -
Determines if the client startup script is registered with the page
Page.IsClientScriptBlockRegistered - Determines if the client script block is
registered with the page Multiple scripts can be added to a page. Each script
uses a key that identifies that specific block of script.
The IsStartupScriptRegistered and IsClientScriptBlockRegistered methods
determine if a specified script has been registered. Registering JavaScript
should be done in the Page_Load event outside of any conditional
Page.IsPostBack logic. Otherwise it will either be available before or after
page post backs but not both. An example in VB.NET
If Not Page.IsStartupScriptRegistered("ScrollToControl") Then
Dim script As New System.Text.StringBuilder
Dim clientID As String = ctl.ClientID script.Append("<script
language='javascript'>")
script.Append("try {")
script.Append("document.getElementById('" & clientID &
"').scrollIntoView();")
script.Append("document.getElementById('" & clientID & "').focus();")
script.Append("} catch (e) {}")
script.Append("</script>")
RegisterStartupScript("setScrollAndFocus", script.ToString()) End If If
Not Page.IsClientScriptBlockRegistered("ShowAlert") Then
Dim script As New System.Text.StringBuilder
script.Append("<script language='javascript'>")
script.Append("function showAlert() {")
script.Append("alert('" & msg & "'); ")
script.Append("return false; }")
script.Append("</script>")
RegisterClientScriptBlock("ShowAlert", script.ToString()) End If
Button1.Attributes.Add("onClick", "return showAlert()")
Regards Rajesh
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