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Taming the Select


So, having a good time with SELECT? Probably not. That's why today, Chris Heilmann will be teaching you the ups and downs of making things look the way your client wants things to look. After all, you do want to get paid, don't you?

Author Info:
By: Chris Heilmann
Rating: 4 stars4 stars4 stars4 stars4 stars / 50
November 15, 2004
TABLE OF CONTENTS:
  1. · Taming the Select
  2. · DOM to the rescue
  3. · But wait, there is more!
  4. · The Script

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Taming the Select - The Script
(Page 4 of 4 )

function tamingselect()
{
  if(!document.getElementById && !document.createTextNode){return;}
 
// Classes for the link and the visible dropdown
  var ts_selectclass='turnintodropdown';   // class to identify selects
  var ts_listclass='turnintoselect';    // class to identify ULs
 
  var ts_boxclass='dropcontainer';     // parent element
  var ts_triggeron='activetrigger';     // class for the active trigger link
  var ts_triggeroff='trigger';      // class for the inactive trigger link
  var ts_dropdownclosed='dropdownhidden'; // closed dropdown
  var ts_dropdownopen='dropdownvisible';  // open dropdown
/*
  Turn all selects into DOM dropdowns
*/
  var count=0;
  var toreplace=new Array();
  var sels=document.getElementsByTagName('select');
  for(var i=0;i<sels.length;i++){
    if (ts_check(sels[i],ts_selectclass))
    {
      var hiddenfield=document.createElement('input');
      hiddenfield.name=sels[i].name;
      hiddenfield.type='hidden';
      hiddenfield.id=sels[i].id;
      hiddenfield.value=sels[i].options[0].value;
      sels[i].parentNode.insertBefore(hiddenfield,sels[i])
      var trigger=document.createElement('a');
      ts_addclass(trigger,ts_triggeroff);
      trigger.href='#';
      trigger.onclick=function(){
        ts_swapclass(this,ts_triggeroff,ts_triggeron)
        ts_swapclass(this.parentNode.getElementsByTagName('ul')[0],ts_dropdownclosed,ts_dropdownopen);
        return false;
      }
      trigger.appendChild(document.createTextNode(sels[i].options[0].text));
      sels[i].parentNode.insertBefore(trigger,sels[i]);
      var replaceUL=document.createElement('ul');
      for(var j=0;j<sels[i].getElementsByTagName('option').length;j++)
      {
        var newli=document.createElement('li');
        var newa=document.createElement('a');
        newli.v=sels[i].getElementsByTagName('option')[j].value;
        newli.elm=hiddenfield;
        newli.istrigger=trigger;
        newa.href='#';
        newa.appendChild(document.createTextNode(
        sels[i].getElementsByTagName('option')[j].text));
        newli.onclick=function(){
          this.elm.value=this.v;
          ts_swapclass(this.istrigger,ts_triggeron,ts_triggeroff);
          ts_swapclass(this.parentNode,ts_dropdownopen,ts_dropdownclosed)
          this.istrigger.firstChild.nodeValue=this.firstChild.firstChild.nodeValue;
          return false;
        }
        newli.appendChild(newa);
        replaceUL.appendChild(newli);
      }
      ts_addclass(replaceUL,ts_dropdownclosed);
      var div=document.createElement('div');
      div.appendChild(replaceUL);
      ts_addclass(div,ts_boxclass);
      sels[i].parentNode.insertBefore(div,sels[i])

      toreplace[count]=sels[i];
      count++;
    }
  }
 
/*
  Turn all ULs with the class defined above into dropdown navigations
*/ 

  var uls=document.getElementsByTagName('ul');
  for(var i=0;i<uls.length;i++)
  {
    if(ts_check(uls[i],ts_listclass))
    {
      var newform=document.createElement('form');
      var newselect=document.createElement('select');
      for(j=0;j<uls[i].getElementsByTagName('a').length;j++)
      {
        var newopt=document.createElement('option');
        newopt.value=uls[i].getElementsByTagName('a')[j].href; 
        newopt.appendChild(document.createTextNode(uls[i].getElementsByTagName('a')[j].innerHTML)); 
        newselect.appendChild(newopt);
      }
      newselect.onchange=function()
      {
        window.location=this.options[this.selectedIndex].value;
      }
      newform.appendChild(newselect);
      uls[i].parentNode.insertBefore(newform,uls[i]);
      toreplace[count]=uls[i];
      count++;
    }
  }
  for(i=0;i<count;i++){
    toreplace[i].parentNode.removeChild(toreplace[i]);
  }
  function ts_check(o,c)
  {
     return new RegExp('\\b'+c+'\\b').test(o.className);
  }
  function ts_swapclass(o,c1,c2)
  {
    var cn=o.className
    o.className=!ts_check(o,c1)?cn.replace(c2,c1):cn.replace(c1,c2);
  }
  function ts_addclass(o,c)
  {
    if(!ts_check(o,c)){o.className+=o.className==''?c:' '+c;}
  }
}

window.onload=function()
{
  tamingselect();
  // add more functions if necessary
}

*For the latest version of this code, please go to http://www.icant.co.uk/forreview/tamingselect/tamingselect.txt.


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