Referencing a .js (JavaScript) file from ASP.NET Content Page

I have seen developers adding a JavaScript reference to the Master Pages and then using the JavaScript functions in Content Pages. However, with this approach, the JavaScript is referenced in each page of the application using that MasterPage as its template. If you want to reference the JavaScript file only on one ContentPage, then here's how to do so:

C#

protected void Page_Load(object sender, EventArgs e)

{

    Page.ClientScript.RegisterClientScriptInclude("onlyone", ResolveUrl(@"Scripts\SomeScript.js"));

    if (!Master.Page.ClientScript.IsStartupScriptRegistered("MS"))

    {

        Master.Page.ClientScript.RegisterStartupScript

            (this.GetType(), "MS", "SomeMethodJS();", true);

    }

}

VB.NET

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)

    Page.ClientScript.RegisterClientScriptInclude("onlyone", ResolveUrl("Scripts\SomeScript.js"))

    If (Not Master.Page.ClientScript.IsStartupScriptRegistered("MS")) Then

        Master.Page.ClientScript.RegisterStartupScript(Me.GetType(), "MS", "SomeMethodJS();", True)

    End If

End Sub

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About The Author

Suprotim Agarwal, ASP.NET Architecture MVP works as an Architect Consultant and provides consultancy on how to design and develop Web applications.

Suprotim is also the founder and primary contributor to DevCurry, DotNetCurry and SQLServerCurry. He has also written an EBook 51 Recipes using jQuery with ASP.NET Controls.

Follow him on twitter @suprotimagarwal