How to make link button hide and show placeholder

Question

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I am using link button but it is not working for making place holder visible and invisible like a normal button

please help

What I have tried:

ASP.NET

<asp:LinkButton ID="link1" runat="server" Text="Forgot Password?" 
OnClick="link1_Click">  
 <br />  
   <asp:PlaceHolder ID="typeEmail" runat="server" Visible="false">  
    <asp:TextBox ID="textbox1" Visible="false" runat="server" AutoComplete="off">

code behind

C#

protected void link1_Click(object sender, EventArgs e)  
{  
    typeEmail.Visible = true;  
    textbox1.Visible = true;  
}

Posted 22-Aug-16 22:13pm

Member 12618369

Updated 23-Aug-16 0:09am

njammy

v2

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njammy · Accepted Answer · 2016-08-23T00:09:00

Solution 1

The reason it's not working is this is what's happening:
1. First load of page, controls are not visible. Great.
2. On click, the controls are visible. Awesome.
3. On subsequent clicks, controls are still visible = true, as viewstate sent back to server on third click is visible=true, so you are not making any effective change to visibility.

Try this instead:

C#

protected void link1_Click(object sender, EventArgs e)
{
    placeHolder1.Visible = !placeHolder1.Visible;
    textBox1.Visible = !textBox1.Visible;
}

UPDATED:
NOTE that the placeholder visibility OVERRIDES all controls visibility inside it.
Therefore, technically you only need to set PlaceHolder's Visible property True or False.

In order for this to work then, you must specify the placeholder default Visible value.

Posted 23-Aug-16 0:09am

njammy

Updated 23-Aug-16 1:48am

v2

Comments

Member 12618369 23-Aug-16 6:48am

Thanks I tried this but it still not working

njammy 23-Aug-16 6:54am

I assure you it works.
Try it on a new page and then fix your own original page step by step.

Member 12618369 23-Aug-16 7:17am

Thanks I tried it in new empty page but still not working

njammy 23-Aug-16 7:19am

Please update your question and post the complete page markup and complete code behind.

Member 12618369 23-Aug-16 7:25am

this the code for new empty page I have tried
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:LinkButton ID="link1" runat="server" CausesValidation="false" Text="Forgot Password?" OnClick="link1_Click">
<br />
<asp:PlaceHolder ID="typeEmail" runat="server" >
<asp:TextBox ID="textbox1" Visible="false" runat="server" AutoComplete="off">

</div>
</form>
</body>
</html>
code behind
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{

}
protected void link1_Click(object sender, EventArgs e)
{
//typeEmail.Visible = true;
//typeEmail.Visible = true;
typeEmail.Visible = !typeEmail.Visible;
textbox1.Visible = !textbox1.Visible;
}
}

I have realised that some problem with link button because I tried button it works fine

njammy 23-Aug-16 7:33am

Ok please pinpoint the actual issue you are facing and explain the behaviour you are getting from this code now?

By the way, your markup for placeholder in this code does not have visible="false" attrivbute.

Member 12618369 23-Aug-16 7:43am

yes even with false attributes does not work
my actual issue is I do need to make place holder visible when I click on the link button

njammy 23-Aug-16 7:48am

Ok I understand what's gone wrong. Please check my updated solution. The placeholder visibility overrides all inner controls.

Member 12618369 23-Aug-16 7:56am

sorry I cannot see your updated solution where is it
thanks

njammy 23-Aug-16 7:57am

I mean in the main solution answer text above.