Solved

Set Visibility with cookies in Javascript

Posted on 2009-07-14
10
348 Views
Last Modified: 2012-05-07
Hi experts,

I have a code on my page to set the visibility of two DIVs (one visible and the other one hidden loading on the same container). So when the user click on link A for example shows DIV A and hides B and vice versa.

My problem is when the user clicks on a link on DIV B (which was hidden when the pages loads) and go to other page when he/she comes back now DIV A is back visible.

So I am trying to get a cookie to remember when the last one has been clicked on to keep it visible when go back to the page but, I really have no clue how to go about this...

Can anyone help? Fix my code or give another similar to execute the same function

Thanks!


function setVisibility(id, visibility) {
document.getElementById(id).style.display = visibility; 
}
 
HTML DIV Code example
 
<div id="DIV_A"><a href='#' onClick="setVisibility('DIV_A", 'inline');setVisibility("DIV_B, 'none')">

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Question by:ClaBap
  • 5
  • 5
10 Comments
 
LVL 9

Expert Comment

by:xBellox
ID: 24854085
First you need some simple functions to make it easier work with javascript cookies, like in the example bellow.

Second, you need to set the cookie value every time the visibility changes, and last, you need to set the visibility according the last status... It will be something like this:


<script language='javascript'>
function createCookie(name,value,days) {
	if (days) {
		var date = new Date();
		date.setTime(date.getTime()+(days*24*60*60*1000));
		var expires = "; expires="+date.toGMTString();
	}
	else var expires = "";
	document.cookie = name+"="+value+expires+"; path=/";
}
 
function readCookie(name) {
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++) {
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	}
	return null;
}
 
function eraseCookie(name) {
	createCookie(name,"",-1);
}
 
 
 
// Your function
 
function setVisibility(id, visibility) {
   document.getElementById(id).style.display = visibility; 
   createCookie("myVis"+id,visibility,356);
}
 
 
 
</script>
 
// YOUR HTML
 
// AND AT THE END OF CODE
<script language='javascript'>
 // setting the stored visibility
 
   if (readCookie('myVisDIV_A')==null) {
      createCookie('myVisDIV_A', 'visible', 356); // Seeting default value 'visible' (change to 'none' if default should be hidden)
 
   }
   function setVisibility('divA', readCookie('myVisDIV_A'));
</script>
</body></html>

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Author Comment

by:ClaBap
ID: 24854339
I'm sorry I'm really new with Javascript so what exactly do I need to change on the code that you provided to make it work with my HTML code? Should I substitute the values: "name", "value" and "date" for something specific??
0
 
LVL 9

Expert Comment

by:xBellox
ID: 24858220
The only thing you need to change is the default visibility, if the div starts hidden or visible...

You define it at this part of the code:

<script language='javascript'>
 // setting the stored visibility
 
   if (readCookie('myVisDIV_A')==null) {
      createCookie('myVisDIV_A', 'visible', 356); // Seeting default value 'visible' (change to 'none' if default should be hidden)
 
   }
   function setVisibility('divA', readCookie('myVisDIV_A'));
</script>

Choose

createCookie('myVisDIV_A', 'inline', 356); // If you want the default is visible

or

createCookie('myVisDIV_A', 'none', 356); // If you want the default is hiddent
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Author Comment

by:ClaBap
ID: 24860929
Dear XBellox,

Thanks for your help. I tried to place the code as you said but it's still not working. I would really appreciate if you could take a quick look at my page to try to help me figure out what I'm doing wrong.
I'm sending the HTML and also the CSS.

One more time thank you very much for your help.
claudio.css.txt
cookies.html.txt
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LVL 9

Accepted Solution

by:
xBellox earned 500 total points
ID: 24861430
Oh... my mistake, a classic "copy and paste" error.... Change the #147 of cookies.html from this (just remove the word "function"):

 function setVisibility('display_prod', readCookie('myVisdisplay_prod'));

to this:

 setVisibility('display_prod', readCookie('myVisdisplay_prod'));



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Author Comment

by:ClaBap
ID: 24861507
Dear xBellox

Just Perfect!!!! Thank you very much
0
 

Author Comment

by:ClaBap
ID: 24861585
xBellox,

Do you have any idea how I could solve my swap image problem?? I have a swap image with the title of each DIV. MY problem is if I click on the img that brings the hidden DIV and leave the page when I come back img "title A" which is the default is now showing "DIV B"??

Should I create another cookie to keep the image?? Any idea??

One more time thank you a lot
0
 
LVL 9

Expert Comment

by:xBellox
ID: 24862210
I added one more function and modify another. Plus i change the onClick event on imgs.

I'm sending the new cookies.html, and also showing the code that I changed.

// Javascript changes
 
function setVisibility(eid, visibility) {
   document.getElementById(eid).style.display = visibility; 
   createCookie("myVis"+eid,visibility,356);
   changeMyImg();
}
 
 
function changeMyImg() {
	if (document.getElementById('display_prod').style.display=='inline') { // If display_prod visibility is inline that means the images should be: whats_new_up and dont_miss_down
	    alert('Changing');
		document.getElementById('whats_new').src = 'http://www.miatamania.com/sitegraphics/Redesign/Prod_Images/whats_new_up.jpg';
		document.getElementById('dont_miss').src = 'http://www.miatamania.com/sitegraphics/Redesign/Prod_Images/dont_miss_down.jpg';
	} else { // If not, the images should be: whats_new_down and dont_miss_up
		document.getElementById('whats_new').src = 'http://www.miatamania.com/sitegraphics/Redesign/Prod_Images/whats_new_down.jpg';
		document.getElementById('dont_miss').src = 'http://www.miatamania.com/sitegraphics/Redesign/Prod_Images/dont_miss_up.jpg';	
	}
}
 
 
// HTML changes
 
<img src="http://www.miatamania.com/sitegraphics/Redesign/Prod_Images/whats_new_up.jpg" alt="What's New" name="whats_new" width="96" height="26" border="0" id="whats_new" />
<img src="http://www.miatamania.com/sitegraphics/Redesign/Prod_Images/dont_miss_down.jpg" alt="Don't Miss" name="dont_miss" width="96" height="26" border="0" id="dont_miss" />

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cookies.html.txt
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Author Comment

by:ClaBap
ID: 24862351
Dear xBellox

Thank you veryyyy much. It's working perfectly now. THANK YOU
0
 
LVL 9

Expert Comment

by:xBellox
ID: 24862445
You're welcome.

I hope you remember  to remove the "alert('Changing');" that I left on code for debug only.

I'm glad that i could help.
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