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home / developersection / interviews / what are the ways to emit client-side javascript from server-side code in asp. net?
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What are the ways to emit client-side JavaScript from server-side code in ASP. NET?

Amit Singh 2435 18 Mar 2011
javascript javascript
Updated 18 Sep 2020
Amit Singh
Amit Singh

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Amit Singh
Amit Singh 18 Mar 2011
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The Page object in ASP. NET has two methods that allow emitting of client-side JavaScript:
RegisterClientScriptBlock and RegisterStartupScript.

Example usage:
Page.RegisterClientScriptBlock("ScriptKey", "<script language=javascript>" + "function TestFn() { alert('Clients-side JavaScript'); }</script>");
Page.RegisterStartupScript("ScriptKey", "<script language=javascript>" + "function TestFn() { alert('Clients-side JavaScript'); }</script>");
ScriptKey is used to suppress the same JavaScript from being emitted more than once. Multiple calls to RegisterClientScriptBlock or RegisterStartupScript with the same value of ScriptKey emit the script only once, on the first call.
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