use javascript to call serverside function : The Official Microsoft ASP.NET Forums

Reply

use javascript to call serverside function

Apr 03, 2012 12:47 PM|LINK

I'm new to javascript and C#, trying to implement my project on these platform.

I have a query on how to execute a server side code using javascript

Code :

// Normal code to upload a file

<asp:FileUpload ID="upload" runat="server" />
<asp:Button ID="submitButton" runat="server" Text="Submit" OnClick="submitButton_Click" />



//javascript code to encrypt a file

<input type="file" name="filedata" onchange="handleFiles(this.files)"/><br />
<input type="button" value ="Encrypt" onclick="encrypt()"/>

Task :

to encrypt the file on local machine and upload to server

can anyone please help me ?

Edited by ajeet.7 on Apr 03, 2012 02:28 PM

Reply

Re: use javascript to call serverside function

Apr 03, 2012 01:22 PM|LINK

Hi Ajeet,

There is not a direct method for calling code behind functions ( but there is for calling code behind events).

If you want to call code behind function then you will have to tweek the code a bit. Pls see the below sample.

HTML
-------

<head runat="server">
    <title></title>
    <script type="text/javascript" language="javascript">
        function CallServer() {
            document.getElementById('hdnHidden').value = "1";
            form1.submit();
        }
    
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <input type="button" id="btnSubmit" value="Submit" onclick="CallServer()" />
    <input type="hidden" id="hdnHidden" runat="server" value="0" />
    </div>
    </form>
</body>
</html>


C#
----
protected void Page_Load(object sender, EventArgs e)
        {
            if (hdnHidden.Value == "1")
            {
                //call your function here
                MyFunction();
            }
        }

        private void MyFunction()
        {
            //place your code here
        }

Here I am using a hidden variable and checking every time on page load so as to verify whether you want to call the page behind function from js or not.

Please let me know if you have any issues.

Thanks

Please mark as answer if you find the post useful
My Blog: Akshay's Notion

Reply

Re: use javascript to call serverside function

Apr 03, 2012 02:27 PM|LINK

the problem is i'm using javascript to process the input file, now after processing i want to upload the output to server using server code. I'm trying to figure out how to handle the output and pass it to the server.

the output function(javascript)

function Save(data) {
alert("Save ??");
uriContent = "data:application/octet-stream;base64," + data;
document.location.href = uriContent;
}

so basically this gives a output file, now i want to upload this output file directly to server using SubmitButton_Click function. Pls help(i'm new to javascript asp and C#)