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maintaining state in JavaScript

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  #1  
Old February 22nd, 2005, 10:36 AM
flyingchair flyingchair is offline
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maintaining state in JavaScript
Hello all.

I have a very simple little show/hide script.

The script is:

php Code:
Original - php Code 
  1.  
  2.  
  3. function displayBoxes(currentMenu) 
  4. {
  5.     var thisMenu = document.getElementById(currentMenu).style;
  6.     
  7.     if (thisMenu.display == "block")
  8.     {
  9.         thisMenu.display = "none";
  10.     }
  11.     else
  12.     {
  13.         thisMenu.display = "block";
  14.     }
  15.  
  16.     
  17.     return false;
  18.     
  19. }
  20.  


(you have all seen that one before)

and this is an example of what it is hiding:


php Code:
Original - php Code 
  1.  
  2. <h3 onClick="return displayBoxes('scratchPad')">Scratchpad</h3>
  3.         
  4. <div style="display:none;" id="scratchPad">
  5.         
  6. <iframe src="scratchpad.php" width="196" align="middle" height="200" marginheight="0" marginwidth="0">
  7. </iframe>
  8.         
  9. </div> 
  10.  


The reaons for the iframe is that it contains a form and I cannot repost the whole page - there is a lot going on.

I want to maintain state but while I write cookies in PHP with my eyes closed I can't quite get JavaScript to do what I want to even though it should be easy. What changes do I need to make to the above so that the block/none value of each included element's style.display value (there are more than one) is maintained after reloading the container page?
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  #2  
Old February 22nd, 2005, 05:37 PM
Yian Yian is offline
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RE: maintaining state in JavaScript
Well I suppose you could just send it in $_SESSION or another global, then write the html with PHP not separately:
echo "<div style="display:".$_SESSION['display'].";" id="scratchPad">";
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  #3  
Old February 22nd, 2005, 05:40 PM
flyingchair flyingchair is offline
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RE: maintaining state in JavaScript
No, because every time I invoke the function I have to write the value from the JavaScript. I tried reading it with PHP when the page loads but it just did not work and I could not fathom out why. I was wondering if someone could help me cheat and give me an all JavaScript option...
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  #4  
Old February 23rd, 2005, 06:49 PM
Yian Yian is offline
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RE: maintaining state in JavaScript
Well you could use cookies through Javascript.
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