syntax error with RegisterClientScriptInclude in codebehind file

Question

I have to call javascript function from javascript file codebehind .aspx page . Presently I am using this syntax which is giving me an error.

this.Page.ClientScript.RegisterClientScriptInclude
    ("showalert('invalidusername','password')","/Public/JS/FailLogin.js");

Answer 1

You're calling the right method but as Guffa says, you're passing it invalid parameters.

Try something like this instead:

this.Page.ClientScript.RegisterClientScriptInclude("myKey",
    "/Public/JS/FailLogin.js");

Or if you want inline script:

this.Page.ClientScript.RegisterClientScriptBlock(GetType(),
    "myKey", "alert('whatever')");

Or to pass in some more dynamic script:

string name = "Joe";
string script = "alert('Your name is" + name + "')";
this.Page.ClientScript.RegisterClientScriptBlock(GetType(),
    "myKey", script);

Please note that in the last example you most JavaScript encode the value of the "name" field. Depending on the version of .NET, one way to do it is this:

string encodedName = JavaScriptSerialize.Serialize(name);

And then pass the encoded name to the "script" variable.

You can even call both methods if you want to both include a JS file as well as run some code that depends on the newly included JS file (the script include should be rendered before the script block).