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Saturday, March 1, 2014

Readonly textbox value lost on postback asp.net:




In this post we will discuss how to retain values in readonly textbox on postback if it lost in Asp.net.

Also you can check my previous posts on:

- Get last modified time of a file in C#.Net

- Change authentication mode after installation of SQL Server

- alert() method examples in JavaScript

In my scenario I was setting some value to some textboxes using JavaScript on page load. And the textboxes are readonly textboxes.

I was setting the value like below:

<script type="text/jscript">
document.getElementById('ContentPlaceHolder1_txtHello').value = 'Hello World'
</script>

<asp:TextBox ID="txtHello" runat="server" ReadOnly="true"></asp:TextBox>
<asp:Button ID="btnGetValue" runat="server" Text="Cancel" OnClick="btnGetValue_Click" />

And on the button click event I want to retrieve the textbox value.

In the page load the value is setting properly but when I tried to get the value in the button click it was giving me "". And If I remove the ReadOnly attribute then I am able to get the value.

There are two approaches to retain the value for readonly textboxes.

1st Approach:
Instead of putting ReadOnly="true" Put  ContentEditable="false", this will work same as ReadOnly that is user will not able to modify the value. Now in the button click you will able to get the value.

2nd Approach:
Add the attribute in the Page_Load like below:

protected void Page_Load(object sender, EventArgs e)
{
     txtHello.Attributes.Add("readonly", "readonly");
}

After this line you will able to get the readonly textbox value in postback.

Hope this will be helpful to you!





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