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Saturday 30 November 2013

How to read value from JavaScript and set in asp.net variable?

Posted by Unknown on 03:15 with No comments so far
Introduction: in this article you will get the trick to read value from JavaScript and set in asp.net variable.
Description: You need to create a html hidden field on page and set its value on client side using JavaScript and then read html hidden field using Request.Forms["hiddenfieldname"]

Implementation: In the design page(.aspx) create the form as:

<%@ Page Language="C#" %>
<script runat="server">
    string var ;
 
    void btn_Click(object sender, EventArgs e)
    {
        var = Request.Form["Hidden1"];
        MessageField.Text = var ;
    }
</script>
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <input id="Hidden1" name="Hidden1" type="Hidden"
            runat="server" value="old value" />
        <input type="button"
            onclick="alert(document.getElementById('Hidden1').value)"
            value="Read Value From Client">
      
        <input type="button"
            onclick="document.getElementById('Hidden1').value = 'New Value'"
            value="Set Value From Client">
      
        <asp:Button runat="server" ID="btn"
            OnClick="btn_Click" Text="Read Value From Server Side" /> 
    </div>
    <p>
        <asp:Literal runat="server" ID="MessageField" />
    </p>
    </form>
</body>
</html>

Enable/Disable Asp.net server Controls using Javascript

Posted by Unknown on 01:01 with No comments so far
Introduction: 
In this article you will come to know Enable/Disable Asp.net server Controls using Javascript.


Following JavaScript is used to Enable/Disable Server Controls:  

  

<script language="javascript" type="text/javascript">

        function SetButtonStatus() {
            var txt = document.getElementById('txtTextBox');
            if (txt.value.length >= 1)
                document.getElementById('btnsubmit').disabled = false;
            else
                document.getElementById('btnsubmit').disabled = true;
        }
</script>

Implementation:
Add a new webform and design the .aspx page as shown below:


<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <script language="javascript" type="text/javascript">
        function SetButtonStatus() {
            var txt = document.getElementById('txtTextBox');
            if (txt.value.length >= 1)
                document.getElementById('btnsubmit').disabled = false;
            else
                document.getElementById('btnsubmit').disabled = true;
        }
</script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:TextBox ID="txtTextBox" runat="server"onkeyup="SetButtonStatus(this,'btnsubmit')"></asp:TextBox><asp:ButtonID="btnsubmit" runat="server" Text="Submit" />
    </div>
    </form>
</body>

</html>

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