Sending a parameter to a JavaScript function through C# code behind

I found a JavaScript function within a .aspx file that I need help with.

<script>
    function somefun(value)
    {

    }
<script>

Within the code-behind class, I am trying to call this function and pass a value.

ScriptManager.RegisterStartupScript(this, typeof(string), "Passing", String.Format("somefun('{0}');", filePath1), false);

However, when I run the code, the function doesn't work properly. The output displayed is

"somefun(the content of the variable)"

What could be causing this issue?

c#javascriptasp.netcode-behind

Answer №2

My preferred approach is to utilize a function for executing JavaScript code within the client's browser...

#region RunJavaScript
private int _scriptIndex = 0;
private void RunJavaScript(string script)
{
    System.Web.UI.ScriptManager.RegisterStartupScript(Page, typeof(Page), "RunScript" + _scriptIndex++, script, true);
}
#endregion

Executing JavaScript is as simple as this...

RunJavaScript("alert('test');");

If you need to pass variables to a function, follow this pattern...

RunJavaScript(String.Format("somefunc('{0}');", filePath1));

This should resolve any issues. The crucial difference between my method and yours likely lies in the parameters passed to RegisterStartupScript – observe that I use Page and typeof(Page), whereas you've used a string.

Answer №3

Feel free to give this a shot

AddScript.ExecuteFunction(this, typeof(string), "Execute", "someaction('" + url1 + "')", false);

Answer №4

Everything seems to be in order.

C# script:

String vls_data = "ExampleData";
ScriptEngine.RegisterStartupScript(this, typeof(string), "script1", "TestJSFunction('" + vls_data + "');", true);

JavaScript routine:

function TestJSFunction(data) 
{  
    var info = data;
    alert("operational");            
}

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