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Showing button on jquery page load event is not working

I am displaying button on jquery page load event but it is not working. After the page is rendered, it is not visible.
It works fine if i set the visibility in code behind Page Load event.
Jquery
function pageLoad() {
$('#btnSwitchDistributor').css({ 'visibility': 'visible', 'display': 'inline-block' });
}
Html
<asp:Button ID="btnSwitchDistributor" runat="server" Text="Switch Distributor" Visible="false" />

According to MSDN, when you set Visible="false" in your server-side code then the element is not rendered to the client at all. Which means your button isn't "invisble" on the resulting page, it doesn't exist on the resulting page. No JavaScript code can interact with an element that isn't present.
It sounds like instead you want to apply a style to the control:
<asp:Button ID="btnSwitchDistributor" runat="server" Text="Switch Distributor" style="display:none;" />
Aside from that, there are two two potential issues here which I can't necessarily confirm from the content of the question, but which you'll want to check...
The ID value you're looking for is the server-side object's ID. This may not necessarily be the client-side id of the resulting HTML element. Examine the page source to see the client-side id. If it's different then you may need to set it explicitly using the ClientID property.
Do you ever call pageLoad() in your JavaScript code? If not then, well, you'd need to do that. I assume in the document.ready event handler? For jQuery that may be as simple as: $(pageLoad)

Just remove the visible html attribute and the JQuery css.

Change of code in browser

I'm using a drop down list for selecting customer, from that i need to remove the setTimeout which i shown in the image, i don't know from where to remove it..can any one suggest me from where it loads..my browser alone show the <select .. >, i need to know from where it loads..
<td><asp:DropDownList Width="180px" CssClass="select_quo_one" ID="ReceiverDropDown"
runat="server" AutoPostBack="true"
OnSelectedIndexChanged="ReceiverDropDown_SelectedIndexChanged">
</asp:DropDownList>
</td>
My Browser Code:

Seems to me you have a few choices -
1) Remove the AutoPostBack - this will stop the SelectedIndexChanged event firing but as you only seem to be popping up an alert you could probably recreate this client side.
2) Put the DropDownList in an UpdatePanel as explained to you in your other question, you may need to do a bit of debugging to get this working but should do what you want.
3) Accept the page reload - accept this is the trade-off when using Web Forms and leave as is.
4) Move to something like MVC which does not have the Postback model.
Sounds like you probably need to do some reading into Web Forms and look at the Pros and Cons and make an informed decision as at the moment you are trying to fight the framework rather than work with it.

The setTimeout is automatically generated by the DropDownList control because AutoPostBack is set to true.
From http://msdn.microsoft.com/en-us/library/system.web.ui.postbackoptions.autopostback(v=vs.110).aspx
The JavaScript setTimeout method is used with the _doPostBack method to ensure that the user action completes before the postback occurs.
Edit:
"flickering occurs in my page so i have to remove the setTimeout value.. – user3595072 17 mins ago"
The setTimeout itself is not (directly) causing the page flickering. The flickering is because the DropDownList is doing a postback every time it is changed bc AutoPostBack is set to true and this causes the page to refresh. If you are not doing anything server side immediately after a customer is selected (like loading other customer info on the page), then you can just set AutoPostBack to false. Otherwise you can look into using an UpdatePanel on your page, or use something like AJAX calls to do your processing without a full postback.
Edit 2:
Since you are only adding javascript within your AutoPostBack event, you can add a jQuery reference (if you do not have one already) by adding the following to your ASPX page:
<script src="//code.jquery.com/jquery-1.11.0.min.js" type="text/javascript"></script>
Then set AutoPostBack="false" on your DropDownList and add this javascript to accomplish the same thing that your AutoPostBack was doing:
<script type="text/javascript">
$(function () {
$('#<%=ReceiverDropDown.ClientID %>').on('change', function (e) {
var benId = $(this).val();
if (benId != '' && benId != '0') {
AddDetails(benId);
}
});
});
</script>

accessing checkbox from asp.net formview in javascript

I have a checkbox in my formview which I want to access in JS to do some enable/disable for textboxes.
This is what I have:
<script type="text/javascript">
$(document).ready(function () {
$('#<%=FormView1.FindControl("chkMap").ClientID%>').change(function () {
if ($(this).is(":checked")) {
}
$('#textbox1').val($(this).is(':checked'));
});
});
With this code, nothing happens and no error is shown in firebug console. Am I doing something wrong? Thanks, Laziale

I have a few guesses. The first one is probably wrong but I had to point it out. The code you posted does not have an end script (</script>) tag. You should check that first.
Second guess is, for some reason <%=FormView1.FindControl("chkMap").ClientID%> this might not be outputting the ID of that control. Have you tried to 'view source' of that page and made sure that the ID is as it should be? Maybe you've changed the ID of that checkbox or something.
Third guess is the way you reference the textbox (#textbox). This is an ASP.NET WebForms page. Your checkbox is a server control (<asp:CheckBox ... />). Are you sure you haven't created the textbox like <asp:TextBox runat="server" ID="textbox1" />? If you have, you would need to write the code like:
$('#<%=FormView1.FindControl("textbox1").ClientID%>').val($(this).is(':checked'));
to reference that textbox control via JavaScript.
I'm suggesting all these because the JS code works fine. I've created a JSFiddle and tested it.
Here's the fiddle. link

Want to show a message box using javascript

Hi everyone I have a web form in which I am having a button on clicking which data back up is being taken, I used the following javascript :
<script language="javascript" type="text/javascript">
function showPleaseWait() {
document.getElementById('PleaseWait').style.display = 'block';
}
</script>
<asp:Button ID="btnTakebackup" runat="server" Text="Take Backup" Enabled="true"
onMouseDown="showPleaseWait()" CausesValidation="false" />
<div id="PleaseWait" style="display: none;">"Please Wait Backup in Progress.."</div>
Hi I am using a button to take a back up.
Now I want to show a message in btnTakebackup_Click() event, whether Back up was successful or not.
I used Response.Write("<script>alert('abcd');</script>"); in btnTakebackup_Click() event.
But the problem is that I want to show the page also, which is not showing instead white background is showing.
Thanks in advance...

To show a message box alert should be able to write out a new script to the response stream:
var script =
"<script type=\"javascript\">" +
"alert(\"Backup in progress, don't go!\");" +
"</script>"
Response.Write(script);
However much this is distasteful, I suppose it is sometimes "necessary".

You can add client side event handlers to ASP controls:
How to: Add Client Script Events to ASP.NET Web Server Controls
Cheers.

Do you really want it to be an alert? (You should know that they lock up the whole browser not just the tab your page is on), do your users really need to acknowledge the backup success by clicking ok or just be informed of it?...
I suggest you have a div on the page that says "Backup successful". The visibility of which can be set by a boolean property BackUpSuccess which you can set to true in the code behind you mention.
<div id="backUpSuccess" <%=BackUpSuccess ? "" : "style='display:none;'"%>>
Backup was successfull
</div>
...you can style the div as you like in your .css file to get attention.
If you really do want an alert you could run some JavaScript on page load to check the content of a hidden input that you set server side in similar fashion...but running javascript on page load is tricky...unless your using jQuery and then you will know it's very easy.

From your question, I understood that after clicking on the button, the data back up is happening, but the alert is not displaying as soon as you clicked the button.This is because you are calling the JavaScript in the button click event which will be fired only after all the code in the button click is executed.I suggest you to add a JavaScript function in the .aspx source page it self and call the JavaScript function as shown below:
<script ...>
function xyz()
{
alert('Please Wait');
}
</script>
and in button declaration
<asp:button id='btn_submit' runat="server" OnClientClick="return xyz();" />

hyper link to set drop downlist to visible

Wondering if there is a way upon clicking on a hyper link to set drop downlist to visible in code behind or asp?
<asp:HyperLink ID="HyperLink2" runat="server">View More Workout Programs »</asp:HyperLink>

If you have to do it in code-behind, then use a LinkButton instead of a HyperLink. Then it will have a click event just like any button and in that click event you can set the other element to .Visible=true.
However, does this need to be done in code-behind? Keep in mind the difference in "visibility" between server-side and client-side code:
If set to .Visible=false on the server-side, the content is not delivered to the client at all.
If set to display:none on the client-side, the content is present and can be viewed in the page source, it's just not displayed by the browser.
In some cases, the former is needed for security purposes. But if it's just a matter of user experience then I would recommend showing/hiding the content entirely on the client-side so as to avoid post-backs that do nothing more than change element display properties.
For example (assuming jQuery):
<a id="toggler" href="#">Show the content</a>
<div id="hidden" style="display:none;">Content</div>
<script>
$(document).ready(function(){
$("#toggler").click(function(){
$("#hidden").show();
});
});
</script>

Use an asp:LinkButton instead of a hyperlink and handle the OnClick event. In the OnClick event, toggle myDropDownList.Visible depending on whether you want to show it or not.

You should implement that kind of feature in the client (javascript code) to improve user experience.
Anyway, you can use a Panel with Visibility=false and put Visibility=true in code behind when link is clicked. You would need to adjust the position of that panel with css to look like a dropdown.

You can try with JQuery : http://www.jquery.com
It will be something like
<script type="text/javascript">
$(document).ready(function(){
$("#<% =HyperLink2.ClientID %>").click(function() {
$("#<% =DropDownList1.ClientID %>").toggle();
});
});
</script>

If you need to send form back to the server, use asp:LinkButton instead and handle OnClick event on the server side. If you need to show drop down list on the client side, use javascript function with onclick client event to show or hide any section you want.