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.

Navneet Hegde wrote:

do I have any other way to compress Dataset

<br />
<br />
     byte[] Dataset2Byte;<br />
     Dataset2Byte = CompressDataSet(DSet);<br />
     MyService Service = new MyService.Service<br />
     Service.UpdateTableData(Dataset2Byte ,tablename)<br />
     //This is the Compression function used.<br />
<br />
public byte[] CompressDataSet(DataSet ds)<br />
        {<br />
            try<br />
            {<br />
                BinaryFormatter bnformat = new BinaryFormatter();<br />
                using (MemoryStream memstream = new MemoryStream())<br />
                {<br />
                    bnformat.Serialize(memstream, ds);<br />
                    byte[] bs = memstream.GetBuffer();<br />
<br />
                    MemoryStream output = new MemoryStream();<br />
                    GZipStream ZipIt = new GZipStream(output,  CompressionMode.Compress, true);<br />
<br />
                    ZipIt.Write(bs, 0, bs.Length);<br />
                    ZipIt.Close();<br />
<br />
                    return output.ToArray();<br />
                }<br />
            }<br />
            catch (ApplicationException ex)<br />
            {<br />
                MessageBox.Show(ex.Message);<br />
                return null;<br />
            }<br />
<br />
        }

     <br />
    public bool UpdateTableData(byte[] byteSet, string TableName)<br />
      {<br />
         // here byte[] byteSet is decompressed to Dataset again<br />
      }<br />
<br />
    private DataSet Decompress(byte[] ds)<br />
    {<br />
        try<br />
        {<br />
            MemoryStream input = new MemoryStream();<br />
            input.Write(ds, 0, ds.Length);<br />
            input.Position = 0;<br />
<br />
            GZipStream Unzipit = new GZipStream(input, 0, true);<br />
            MemoryStream output = new MemoryStream();<br />
<br />
            byte[] bf = new Byte[4096]; { }<br />
            int read = 1;<br />
            read = Unzipit.Read(bf, 0, bf.Length);<br />
            while (read > 0)<br />
            {<br />
                output.Write(bf, 0, read);<br />
                read = Unzipit.Read(bf, 0, bf.Length);<br />
            }<br />
            Unzipit.Close();<br />
            byte[] result = output.ToArray();<br />
<br />
            BinaryFormatter bnformat = new BinaryFormatter();<br />
            using (MemoryStream mStream = new MemoryStream(result))<br />
            {<br />
                return (DataSet)bnformat.Deserialize(mStream);<br />
            }<br />
<br />
        }<br />
        catch (Exception ex)<br />
        {<br />
             throw ex;<br />
        }<br />
    }