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Code Behinde Function!

Posted on 2004-10-13
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Last Modified: 2006-11-17
Hi All,
i need to know how to call a function in the code behinde(server side) from the client side(html part) in asp.net using vb.net???
any comment will be very helpful
thanx in advanced.
samjav
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Question by:samjav
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by:
ihenry earned 150 total points
ID: 12295665

If you mean make a direct method call to a server-side function from client-side javascript, it would be more appropriate to say "force a postback from client javascript". Read this article
How postback works in ASP.NET
http://www.xefteri.com/articles/dec102002/default.aspx

If you mean to call code-behind function from aspx or using inline code you can use old school asp Response.Write shortcut like so
<% CallToMethod1() %>, where CallToMethod1 is a function defined in code-behind.
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by:stumpy1
stumpy1 earned 150 total points
ID: 12297248
Here is an example of how you would do it on an aspx page to call a code-behind function to create a file:

Lets say that the function that you need to call in the code behind is for a linkbutton called CreateFile_Click

Then In the header part of the HTML for the aspx page you need to declare the javascript to call you code-behind function (ie. CreateFile)
<script language="javascript">
<!--
function CreateFile()
{
      fileName = prompt('Type the name of the file you want to create:','');
      if ((fileName) && (fileName!=""))
      {
            document.forms['BrowseFiles'].elements['funcParam'].value = fileName;
            __doPostBack('CreateFile', '');
      }
}
// -->
</script>
This uses the javascript __doPostBack function that is created by asp.net to postback to the CreateFile_Click function in the code-behind.

Then in the HTML on the page inside your form you will need additional code such as the following:

<input id="funcParam" type="hidden" runat="server">
...
<A href="javascript:CreateFile();"><IMG height="28" alt="Create a new text file" src="./Images/NewFile.gif" width="28" border="0">
</A>
<asp:linkbutton id="CreateFile" onclick="CreateFile_Click" Runat="server" Visible="False"></asp:linkbutton>

Notice that there is a linkbutton control that is not visible that is the actual control that we are posting back to too do the work. Ie. Clicking on the <A href... link calls the clientside javascript function which sets the value of a hidden field. The Javascript function then uses the automatically generated client side javascript function to perform the postback to the server side function for the linkbutton control (CreateFile_Click)

I hope this helped.
PS. This is paraphrased from the Wrox book "ASP.NET Website Programming, Problem - Design - Solution"
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