Dynamically Generated JavaScript 1

[portalguy123]

Hello Experts,

I am working on an AJAX application and I get a response back from the url which populates a div which has both HTML as well as JavaScript code , I need to extract the javascript from the response and set in the parent documnet's head tag so as to be able to acees the javascript in a global context.I use the following code to do so ,

extractAndProcess = function(windowObj,n){

    var re = /<script[\s\S]*?>([\s\S]*?)<\/scr/igm;
    var result = '';
    var match; 
    while (match = re.exec(responseString)) { 
     //document.write(match[1]);
     //eval(match[1]);
     result += match[1]; 
     //alert ('The match is '+match[1]);
   }
   
   alert('The result is '+result);
    
   var head = document.getElementsByTagName("head")[0];
   script = document.createElement('script');
   script.id = 'uploadScript';
   script.type = 'text/javascript';
   [b]script.src = result;[/b]
   head.appendChild(script);
   
   alert('The set script is '+   document.getElementsByTagName("head")[0].value);
   populateEmailids(windowObj,n);
}

But when I print the value of teh head element I get a null back , can you please let me know where I might be wrong.

Thanks in Advance!!

-Bob F.

 

[portalguy123]

Anyone?? Flava and Trollacious not even you guys!!!

 

[trollacious]

What does the HTML at the top of the page look like?

Lee

 

[portalguy123]

Hello Lee,

Thanks for the reply!Are you asking what the top of teh HTML looks after the head element is appended with a script element? I think the problem Iam facing is that the script element has a src attribute which can only point to a URL ,but in my case I have the script in a variable , and thats where I am stuck at, to have the dynamically created script element have this javascript in the variable as its content.I believe you cant use innerText and innerHTML for the script tag , is there any other way around..

 

[tsuji]

aj** forum is there.

http://www.tek-tips.com/threadminder.cfm?pid=1600

 

[portalguy123]

Though its a AJAX scenario, its a general javascript issue, I wouldnt think it to be AJAX specific..

 

[tsuji]

It's your word, not mine. Why then you cross post to there?

 

[BillyRayPreachersSon]

What does "result" equate to? Is it a valid filename? if not, it will never work.

Dan



Coedit Limited - Delivering standards compliant, accessible web solutions

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[BillyRayPreachersSon]

Hmm - hang on - what happens if you print the value of the head element BEFORE you try to append? If it's null, the append will never work.

You must be able to get a reference to the head element to be able to append to it.

Dan



Coedit Limited - Delivering standards compliant, accessible web solutions

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[portalguy123]

Hello Dan,

Thanks for the reply, I able to print the innerHTML of the head before appending the script element to teh head element.

I have tried multiple scenarios, all of them fail.Before I mention them , just to let you know the JS is in a string not in a file or filename.

Case 1: Try to append the head.innerHTML with <script>'js string' </script> --doesnt work get an error saying "Could not set the innerHTML property. Invalid target element for this operation".

Case 2: Try to create a script element and append it to the head element, I couldnt figure out a way to have the script in the string made part of the script element, script.src can only point to a url, script.innerText and script.innerHTML cant be used either they give out errors as well, I am using IE and the head element is not null as I am able to print the innerHTML of it.

 

[BillyRayPreachersSon]

Does this need to work in all browsers? I can suggest something that will easily work in Firefox, but not IE...

Dan


Coedit Limited - Delivering standards compliant, accessible web solutions

[tt]Dan's Page [blue]@[/blue] Code Couch

http://www.codecouch.com/dan/

[/tt]

 

[portalguy123]

Unfortunately ,it needs to work in IE at the least..

 

[portalguy123]

Now that it seems I cant have the script element populated with the script code in the string var , I have chnaged my approach to extract the java script and evaluate it , I get an error for the following regexp , can anyone please let me know what might be wrong with this RegExp.

Thanks in Adnavce!

var re2 = /\/\/ **** This section[\s\S]*?****([\s\S]*?)-->/igm;

 

[kaht]

I don't think you can have multiple * in a row. An * in regexp says match 0 or more instances of the preceding character, so it doesn't make any sense to have more than 1 in a row. If you meant it to match the literal character * then you must first escape it with a backslash (\)

-kaht

http://www.silkypups.com

[small](All puppies have now found loving homes, thanks for all who showed interest)[/small]

 

[portalguy123]

I am trying to extract the java script in the following text...

// **** This section contains code that will run when the page is loaded ****


// Build the netui_names table to map the tagId attributes
// to the real id written into the HTML
if (netui_names == null)
   var netui_names = new Object();
netui_names.fname0="fname0"
netui_names.email0="email0"
netui_names.lname0="lname0"
netui_names.box0="wlw-checkbox_key:{request.results[0].checked}"
netui_names.mi0="mi0"

-->

 

[portalguy123]

I am hiting one roadblock after another after evaluating the script extracted in the above post , I dotn see the values in the netui_names object.I am using the following code to extract the scipt from the above example and evaluating them as follows but I dotn see the values in netui_names object..

var re2 = /\/\/ \*\*\*\* This section[\s\S]*?\*\*\*\*([\s\S]*?)-->/igm;
   var result2 = '';
   var match2 = '';
   while (match2 = re2.exec(result)) { 
      result2 += match2[1]; 
     
   }
   alert('The result2 is '+result2);
   eval(result2);

Can any body please let me know why I cant see the effect of eval on the netui_names object ..

FYI the result2 has the following script stored in it..

// Build the netui_names table to map the tagId attributes
// to the real id written into the HTML
if (netui_names == null)
   var netui_names = new Object();
netui_names.fname0="fname0"
netui_names.email0="email0"
netui_names.lname0="lname0"
netui_names.box0="wlw-checkbox_key:{request.results[0].checked}"
netui_names.mi0="mi0"

Is it becuase it has comments in the beginning...

 

[portalguy123]

Ok it seems that the problems is that the following code is not being evaluated ...

var result2 has the following value;and eval(result2) has not effect , can anyone shed some light on this aspect of the problem..

Thanks.

result2=

 // Build the netui_names table to map the tagId attributes
// to the real id written into the HTML
if (netui_names == null)
   var netui_names = new Object();
netui_names.fname0="fname0"
netui_names.email0="email0"
netui_names.lname0="lname0"
netui_names.box0="wlw-checkbox_key:{request.results[0].checked}"
netui_names.mi0="mi0"

-Bob.