Web Development

function m(a, f)
{
    var ret = [];
    for (var i=0; i<a.length; ++i)
    {
        var val = f(a[i]);
        if ( val != null )
            ret.push(val);
    }
    return ret;
}

var els = document.getElementsByTagName("*");
var ids = m(els, function(el) { return el.id?el.id:null; });

// map routine - takes one array (a) and function (f), transforms each element of a using f(), 
//  returns array of results.
// f() takes a single parameter (the array element) and returns a result. If said result
//  is null, it will be excluded from the final array.
function m(a, f)
{
    var ret = [];
    for (var i=0; i<a.length; ++i)
    {
        var val = f(a[i]);
        if ( val != null )
            ret.push(val);
    }
    return ret;
}

// retrieve array containing all elements in the document.
var els = document.getElementsByTagName("*");
// retrieve array of IDs for elements that have IDs
var ids = m(els, function(el) 
   { 
      // return the ID if it exists, otherwise null to exclude this element.
      return el.id?el.id:null;
   });

Thaer Hamael wrote:

i do the follwing
alert(els)// the retuern of this alert is object
and then replace it with
alert(els.id)//this convert return undefind value what is the problem with this

Thaer Hamael wrote:

alert(a.length)//its return the wrong number of element in my page

Thaer Hamael wrote:

alert(a[i])//this alert return undefind

Thaer Hamael wrote:

Mr Shon pls if you have any code as sampel and if you can give me it

CandyMe wrote:

I'm using AJAX.

CandyMe wrote:

I have a textbox and a button inside an updatepanel.