Developing Webpart Postback logic in C# script

I am currently facing challenges with SharePoint webparts programming. I am unsure about how to trigger a postback for an object at a specific time. I have come across suggestions to use "javascript" for this purpose, but I am having trouble understanding the concept.

Let's consider a scenario:

void BIGenerate_Click(object sender, EventArgs e)
{
if (this.txtPassword.Text != "")
{
bla bla bla code
}
//CODE TO GENERATE POSTBACK
}

What is the correct code that needs to be inserted there? How can I call a JavaScript function at that particular moment? Your assistance is greatly appreciated!

javascriptsharepointpostback

Answer №1

When using ASP.NET, a client-side JavaScript is generated to handle postbacks:

function __doPostBack(eventTarget, eventArgument) {
    if (!theForm.onsubmit || (theForm.onsubmit() != false)) {
        theForm.__EVENTTARGET.value = eventTarget;
        theForm.__EVENTARGUMENT.value = eventArgument;
        theForm.submit();
    }
}

Simply call your postback function with the required arguments:

<script language='JavaScript'>
    __doPostBack('__Page', 'MyArg');
</script>

To handle the postback in your code-behind:

if (IsPostBack)
{
    string eventArg = Request["__EVENTARGUMENT"];
    if (eventArg == "MyArg")
    {
        // Perform actions associated with the postback
    }
}

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