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Thread: Making Expanding Menu Hierarchy Sensitive.

  1. #1
    Join Date
    Nov 2009
    Location
    Boston, MA, USA
    Posts
    52

    Making Expanding Menu Hierarchy Sensitive.

    I'll get to the hierarchy sensitive part next, but for now I need help making this even work with two top-level links.

    I'm building a left-navigation that's expandable. Click a little + box image to the left of a top-level section's link, and all the links to sub-sections within that section expand out, the + box image becomes a - box image, and clicking the - box collapses the sub menu links. The scripts below work so long as I just have one top-level section, but because they us an ID for the +-box image, when I add a second top-level menu item, the swapImage function no longer works. How do I make it work with a class instead of an ID? The JavaScript and HTML code is below:

    HTML Code:
    <!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" xml:lang="en" lang="en">
    <head>
      <title>Test Expanding Menu</title>
      <meta http-equiv="content-type" content="text/html;charset=utf-8" />
      
      <script language="JavaScript" type="text/JavaScript">
      <!--
      intImage = 2;
      function swapImage() {
      switch (intImage) {
       case 1:
         img1.src = "http://lib.store.yahoo.net/lib/yhst-68986320726817/menu-open.gif"
         intImage = 2
         return(false);
       case 2:
         img1.src = "http://lib.store.yahoo.net/lib/yhst-68986320726817/menu-close.gif"
         intImage = 1
         return(false);
       }
      }
    
      menu_status = new Array();
      
      function showHide(theid){
          if (document.getElementById) {
          var switch_id = document.getElementById(theid);
      
              if(menu_status[theid] != 'show') {
                 switch_id.className = 'show';
                 menu_status[theid] = 'show';
              }else{
                 switch_id.className = 'hide';
                 menu_status[theid] = 'hide';
              }
          }
      }
      //-->
      </script>
      <style type="text/css">
      
      .img1 {
      test-decoration: none;
      border: 0;
      margin: 3px;
      display: inline;
      vertical-align:middle;
      }
      
      .menu1{
      background-color:#ffc;
      color: #b00;
      margin-left: 5px;
      text-decoration: none;
      border: 0;
      height: 20px;
      }
      
      .submenu{
      background-color: #ff8;
      color: #b00;
      display: block;
      height: 19px;
      margin-left: 38px;
      padding-top: 2px;
      padding-left: 7px;
      }
      
      .hide{
      display: none;
      }
      
      .show{
      display: block;
      }
      
      #menu {
      background-color: #ffc;
      color: #b00;
      width: 200px;
      }
      #menu ul {
      list-style: none outside none;
      margin: 0;
      padding: 0;
      }
      #menu li {
      margin: 0;
      padding: 0;
      }
      #menu a {
      text-decoration: none;
      font-size: 12pt;
      font-weight: blod;
      color: #b00;
      }
      </style>
    </head>
    <body>
    <table border="0" cellpadding="0" cellspacing="0">
      <tr>
        <td id="menu">
          <ul>
            <li><a href="#" onclick="showHide('mymenu1')" class="menu1">
        	  <img id="img1" name="img1" src="http://lib.store.yahoo.net/lib/yhst-68986320726817/menu-open.gif" width="14" height="14" alt="toggle menu expansion"
                onclick="swapImage();" /></a><a href="#">Section 1</a>
            </li>
              <div id="mymenu1" class="hide">
                <a href="#" class="submenu">Link One here</a>
                <a href="#" class="submenu">Link Two here</a>
                <a href="#" class="submenu">Link Three here</a>
                <a href="#" class="submenu">Link Four here</a>
              </div>
          </ul>
        </td>
      </tr>
    </table>
    </body>
    </html>
    Last edited by ETpro; 03-17-2010 at 07:59 PM.

  2. #2
    Join Date
    Mar 2010
    Posts
    2,803
    How do I make it work with a class instead of an ID?
    I don't know if it is of any use to you but if you need a way of getting element objects by a class, this script will do the trick.

    It returns an array of elements for a given class name.

    Code:
     
    function getElementsByClassName(oElm, strTagName, strClassName)
    {
        var arrElements = (strTagName == "*" && oElm.all)? oElm.all : oElm.getElementsByTagName(strTagName);
        var arrReturnElements = new Array();
        strClassName = strClassName.replace(/\-/g, "\\-");
        var oRegExp = new RegExp("(^|\\s)" + strClassName + "(\\s|$)");
        var oElement;
        for(var i=0; i<arrElements.length; i++)
        {
            oElement = arrElements[i];
            if(oRegExp.test(oElement.className))
            {
                arrReturnElements.push(oElement);
            }
        }
        return (arrReturnElements)
    }
    In the calling statement,

    set oElm = document (the document object),
    strTagName = tag name of the elements
    strClassName = class name of the elements

    You then loop through the returned array and do whatever you like to elements.

    I didn't write this script. I got it off the www a few years ago but it works well.

  3. #3
    Join Date
    Nov 2009
    Location
    Boston, MA, USA
    Posts
    52
    Thanks for the reply, but sleeping on it, I realized using a class would never work, because the script couldn't then know which + box was clicked. Using multiple IDs isn't working either. So it looks like the problem is more fundamental than I thought and I'm going to repost it using a more specific title to hopefully zero in onn at least the first part of it.

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