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Question #293

Can I set the Pop Menu Magic 2 (PMM2) Current Marker system to automatically open to a specific menu item by matching to a specific URL parameter?

The Answer

Prepared Feb. 2010 by Gerry Jacobsen, PVII

Here's a special Pop Menu Magic 2 (PMM2) function that will check for a specific URL parameter in the page address and look for a match in the menu links, and then current mark the menu accordingly.

Here's how to deploy this tweak:

1. Open the p7PMMscripts.js file and scroll down to the end of the file, make a new line and then Copy & Paste this new function into that line:

function P7_PMMopenUrlParam(dv,param){	
 var i,h,s,vV,tD,k=-1,pp,a;
 tD=document.getElementById(dv);
 if(tD){
   h=document.location.search;
   if(h){
     h=h.replace('?', '');
     s=h.split(/[=&]/g);
     if(s&&s.length) {
       for(i=0;i<s.length;i+=2){
         if(s[i]==param&&s[i+1]){
           vV=param+'='+s[i+1];
           break;
         }
       }
     }
   }
   if(vV){
     tA=tD.getElementsByTagName('A');
     for(i=0;i<tA.length;i++){
       if(tA[i].getAttribute('href')!='#'&&tA[i].search&&tA[i].search.indexOf(vV)>-1){
         k=i;
         break;
       }
     }
   }
   if(k>-1){
     pp=tA[k].parentNode;
     while(pp){
       if(pp.tagName&&pp.tagName=='LI'){
         P7_PMMsetClass(pp,'li_current_mark');
         a=pp.getElementsByTagName('A');
         if(a&&a[0]){
           P7_PMMsetClass(a[0],'current_mark');
           if(a[0].hasImg){
             im=a[0].getElementsByTagName('IMG')[0];
             im.mark=true;
             im.src=im.p7imgswap[3];
           }
         }
       }else{
         if(pp==tD){
           break;
         }
       }
       pp=pp.parentNode;
     }
   }
  }
 }

2. Now we'll activate this to run automatically when the page loads. Locate this code block near the end of the P7_PMMinit() function, around line 259:

     if(tM.p7opt[11]==1){
       P7_PMMcurrentMark(tM);
     }
    }
  }
  p7PMMa=true;

3. Add a new line after the first } and Copy & Paste this into that new line:

     P7_PMMopenUrlParam(tM.id,'myParam');

so that it now looks like this:

     if(tM.p7opt[11]==1){
       P7_PMMcurrentMark(tM);
     }
     P7_PMMopenUrlParam(tM.id,'myParam');
    }
  }
  p7PMMa=true;

4. Change the 'myParam' text to reflect the actual parameter you wish to match, for example, if you want the system to look for deptID parameter it should look like this:

    P7_PMMopenUrlParam(tM.id,'deptID');

4. Save and close the file.

When the page first loads the PMM2 system will now look at the page's URL parameters and if it finds a 'deptID' parameter it will compare the 'deptID' value in the page URL to the menu links. If it finds a menu link with a 'deptID' parameter and matching value it will current mark that link and any parents.

So, if the detail product page address is:
http://mySite.com/product.php?deptID=263&prodID=1022

the system will match to this link in the menu:
<li><a href="/department.php?deptID=263>Department 263</a></li>

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