Modify CSS style globally with javascript?

Expert Comment

by:gurvinder372

ID: 348894082011-02-14

you can get the handle to an element, and change its style

var element = document.getElementById("elementId");
element.style.display = "none"; //or block

LVL 9

Expert Comment

by:wellhole

ID: 348894322011-02-14

Something like this?

if(document.styleSheets){
var sheet = document.styleSheets[0]
if(sheet){
var ssRules = sheet.cssRules ¦¦ sheet.rules;
if(ssRules){
var result = null;
for(var c = 0; c < ssRules.length;c++){
if(ssRules[c].selectorText == ".javascript_only"){
result = ssRules[c].style;
break;
}
}
if(result){
result.display = "block";
}
}
}
}

Expert Comment

by:gurvinder372

ID: 348894342011-02-14

check here
http://www.w3schools.com/jsref/dom_obj_style.asp

Accepted Solution

by:gurvinder372

gurvinder372 earned 250 total points

ID: 348894422011-02-14

or you can assign a class to those elements and then fetch those elements by their class names in one go, and then change their display style
http://snipplr.com/view/1696/get-elements-by-class-name/

Expert Comment

by:P1ST0LPETE

ID: 348894522011-02-14

Sounds like you need to start using jQuery. http://api.jquery.com/css/

With jQuery you could access all the elements with the 'Edit' class applied to them and change their css style like this:

$('.Edit').css('display', 'none');

Expert Comment

by:thecrew

ID: 348896162011-02-14

I think you're on the right track.
I would use jQuery just to make life easier, if you are not already using it on the site it would be as simple as including the file inside the <head>.
Then, to do what you are talking about you should be able to do something like this:

<style type="text/css">
	.MyClass {display:none;}
	.MyNEWClass {display:block;}
</style>

<script type="text/javascript">
    function changeClass()
    {
       // this adds the class MyNEWClass to the elements with a class of .MyClass
      $('.MyClass').addClass('MyNEWClass');
    }

       // this is just a click listener, it does not need to look exactly like this
    $(':button:contains(A Button)').click(changeClass);
</script>

<!-- button to show or hide the edit buttons -->
<button>A Button</button>

<!-- edit buttons to show or hide -->
<div class="MyClass">Edit Buttons</div>
<div class="MyClass">Edit Buttons</div>
<div class="MyClass">Edit Buttons</div>

You can add multiple classes, styles overwrite each other in order. You could use the removeClass() call but if you remove the class you are searching by then you will get stuck. It might be better to start your elements out with two classes, use one to "search" by and one to remove or add. (to give an element more than one class just separate the classes with a space like this <div class="ClassOne ClassTwo"></div>)

You could also make use of these to accomplish the same outcome:
$('.MyClass').removeClass('MyNEWClass');
$('.MyClass').toggleClass('MyClass');

Good luck!

Author Comment

by:Cerixus

ID: 348896752011-02-14

I like the JQuery idea and I am using it for other stuff, but I'm not very good with javascript at all. Right now I have a checkbox that I'm trying to use as the toggle.

<div class="ToggleEditMode"><asp:CheckBox ID="CheckBox1" runat="server" AutoPostBack="True" />Edit Mode</div>

How would I modify your example of the "button" click listener to make it work with a check box? Also, does this method require a postback or would it render the client side changes immediately?

Assisted Solution

by:gurvinder372

gurvinder372 earned 250 total points

ID: 348897162011-02-14

$(".ToggleEditMode input[type='checkbox']").bind("click", function(){
$(this).parent(".ToggleEditMode").toggle();
})

Assisted Solution

by:thecrew

thecrew earned 125 total points

ID: 348897452011-02-14

This might help then:

if($("#CheckBox1").attr("checked"))
{
//do stuff
}
else
{
//do different stuff (or nothing at all)
}

-Logan

Expert Comment

by:thecrew

ID: 348897702011-02-14

Using

$(".ToggleEditMode input[type='checkbox']").bind("click", function(){
$(this).parent(".ToggleEditMode").toggle();
})

Is much better than the if/else statement, it works with the click like you want.

Assisted Solution

by:P1ST0LPETE

P1ST0LPETE earned 125 total points

ID: 348899552011-02-14

Lets say all your buttons had the 'Edit' class applied like what you were talking about in your original post.

<asp:Button ID="EditButton1" runat="server" CssClass="Edit" />

Using your checkbox:

<div class="ToggleEditMode"><asp:CheckBox ID="CheckBox1" runat="server" AutoPostBack="True" />Edit Mode</div>

You could have jQuery on the page like this which would immediately make changes to the client's page without needing to do a postback:

$(document).ready(function()
{
//Add javascript click event handler to CheckBox1
$('#CheckBox1').click(function()
{
//Change all elements using 'Edit' class to 'display: none' or 'display: inline' based on check state
$('.Edit').('display', this.checked ? 'inline' : 'none');
});
});

There are several ways/variations to accomplish this task using jQuery. Others have listed corrected ways of doing it as well.

Author Comment

by:Cerixus

ID: 348901752011-02-14

Okay I'm having trouble following all of this and putting it together and getting it to work. I have attached the JS, asp/html and CSS. What am I missing? Also, does it require a postback or should it just do it immediately?

CSS:

.Edit               {padding-left: 2px; display: none;}
.Show               {display: inline;}

JAVASCRIPT:

<script language="javascript" type="text/javascript">
   if($("#CheckBox1").attr("checked"))
   {
       alert("Test");
       $('.Edit').addClass('Show');
   }
   else
   {
       $('.Edit').removeClass('Show');
   }
</script>

ASP:

<div class="ToggleEditMode"><asp:CheckBox ID="CheckBox1" runat="server" AutoPostBack="False" />Edit Mode</div>

Author Comment

by:Cerixus

ID: 348902692011-02-14

This one also didn't seem to work, but I like it best for it's simplicity:

$(document).ready(function()
{
//Add javascript click event handler to CheckBox1
$('#CheckBox1').click(function()
{
//Change all elements using 'Edit' class to 'display: none' or 'display: inline' based on check state
$('.Edit').('display', this.checked ? 'inline' : 'none');
});
});

Expert Comment

by:gurvinder372

ID: 348903252011-02-14

not sure if CheckBox1 is the correct id of the checkbox, please check the same in view source

Expert Comment

by:P1ST0LPETE

ID: 348903772011-02-14

Ok, made a quick example for you so you can see it working:

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="PlantMatrix.WebForm1" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <style type="text/css">
        .Edit { color: Blue; display: none; }
    </style>
    <script type="text/javascript" src="http://code.jquery.com/jquery-latest.min.js"></script>
    <script type="text/javascript">
        $(document).ready(function ()
        {
            $('#CheckBox1').click(function ()
            {
                $('.Edit').css('display', this.checked ? 'inline' : 'none');
            });
        });
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:CheckBox ID="CheckBox1" runat="server" Text="Show Edit Buttons" />
        <br />
        <asp:Button ID="Button1" runat="server" Text="Edit 1" CssClass="Edit" />
        <asp:Button ID="Button2" runat="server" Text="Edit 2" CssClass="Edit" />
        <asp:Button ID="Button3" runat="server" Text="Edit 3" CssClass="Edit" />
    </div>
    </form>
</body>
</html>

Expert Comment

by:thecrew

ID: 348904522011-02-14

I just tested this, it works well. Give it a try!

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Untitled Document</title>
<script type='text/javascript' src='http://code.jquery.com/jquery-latest.min.js'></script>

<style type="text/css">
	.Edit {padding-left: 2px; display: none;}
	.Show {display: inline;}
</style>
	<script type="text/javascript">
	$(document).ready(function(){
		
		// Add onclick handler to checkbox w/id checkme
	   $("#CheckBox1").click(function(){
		
		// If checked
		if ($("#CheckBox1").is(":checked"))
		{
			//show the hidden div
			$(".Edit").show("fast");
		}
		else
		{	   
			//otherwise, hide it 
			$(".Edit").hide("fast");
		}
	  });
	
		});
	 </script>


</head>

<body>

<div class="ToggleEditMode">

<input type="checkbox" ID="CheckBox1" runat="server" AutoPostBack="False" />Edit Mode</div>

<div class="Edit">EDIT BUTTON</div>
<div class="Edit">EDIT BUTTON</div>
<div class="Edit">EDIT BUTTON</div>
<div class="Edit">EDIT BUTTON</div>
</body>
</html>

Expert Comment

by:P1ST0LPETE

ID: 348904702011-02-14

gurvinder372: "not sure if CheckBox1 is the correct id of the checkbox, please check the same in view source"

Yes, didn't think about this possibility. If you are using a master/content page setup, then controls on your content pages will have big prefixes on their ID's looking something like this:

ctl00_ContentPlaceHolder1_CheckBox1

Which would cause the javascript to fail.

A work around for this would be changing the $('#CheckBox1') to $('[id*="CheckBox1"]')

Making the javascript now look like this:

$('[id*="CheckBox1"]').click(function ()
{
$('.Edit').css('display', this.checked ? 'inline' : 'none');
});