Introduction: In this article i
am going to explain How to enable or disable asp.net controls on textbox value
change or entering/typing text in TextBox or in other words we can say enable
and disable any asp.net controls like TextBox, Label, DropDownList, RadioButton,
RadioButtonList, CheckBox, CheckBoxList etc as per requirement as soon as we
start typing in the TextBox control in asp.net using Javascript.
Description: While working on
asp.net project it was required to enable the reset button that clears the
textbox when clicked. But on page load by default this button should be disabled
and whenever we enter any character i.e. we start typing in the TextBox then
the reset button should be enabled so that if required we can clear out the
values we entered.
For this purpose i used the onkeyup event of JavaScript to
check if anything has been entered in textbox or not? If yes then enable the
reset button otherwise disable the button.
In previous articles i explained How to JavaScript validation in asp.net website and Implement Jquery form validations and Validate CheckBoxList using JavaScript and Validate the number range using JavaScript and Call java script function from code behind file and Message box in asp.net website using JavaScript and Check whether a string is numeric or not
Implementation: Let's create a
simple web page to demonstrate it by an example.
- In the <Head> tag of the design page (e.g. default.aspx) create a JavaScript function as:
<script type="text/javascript"
language="javascript">
function EnableDisableButton(sender, target) {
if (sender.value.length > 0)
document.getElementById('<%= btnReset.ClientID %>').disabled =
false;
else
document.getElementById('<%=
btnReset.ClientID %>').disabled
= true;
}
</script>
- In the <Form> tag design the asp.net page e.g. default.aspx as:
<div>
<fieldset style="width:320px">
<legend>Enable/Disable asp.net control on typing in
textbox</legend>
<asp:TextBox ID="txtTest"
runat="server"
Width="250px"
onkeyup="EnableDisableButton(this,'btnReset')"></asp:TextBox>
<asp:Button ID="btnReset"
runat="server"
Text="Reset"
Font-Bold="true"
Enabled="false" onclick="btnReset_Click" />
</fieldset>
</div>
- In the Code behind file (default.aspx.cs) write the code as:
protected void btnReset_Click(object
sender, EventArgs e)
{
txtTest.Text = string.Empty;
}
Note: I have enabled and disabled
the button control but you can do it with any other asp.net control as per
requirement. You just need to change the Id of the "btnReset" with the id of any
other control you want to enable or disabled in the Above javaScript function.
Asp.Net VB Section
- In the <Form> tag design the asp.net page e.g. default.aspx as:
<div>
<fieldset style="width:320px">
<legend>Enable/Disable asp.net control on typing in
textbox</legend>
<asp:TextBox ID="txtTest"
runat="server"
Width="250px"
onkeyup="EnableDisableButton(this,'btnReset')"></asp:TextBox>
<asp:Button ID="btnReset"
runat="server"
Text="Reset"
Font-Bold="true"
Enabled="false"
/>
</fieldset>
</div>
- In the Code behind file (default.aspx.vb) write the code as:
Protected Sub btnReset_Click(sender As
Object, e As
System.EventArgs) Handles
btnReset.Click
txtTest.Text
= string.Empty
End Sub
Now over to you:
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