jquery returns no data from query, throws error null or not an object

Question

 var instance = new readers_cls();
 var theID = $('#theID').val();
 var thedata = instance.getReaderNumbers(theID);

 $.each(thedata.data, function(){
 $('#theReader').append('<tr class="readerRow"id="new' + index + '"><td align="center"><input type="text" id="reader' + index + '" name="reader' + index + '" value="' + this.readernumber + '" class="readerName"></td></tr>');
                    index++;
                });

Works fine if I actually have data returned but throws error when returns no data, not sure how to test for the null or not and object on the .each

What do you want to do if it IS null, add blank rows or no row at all? — Mark Schultheiss
– Mark Schultheiss, Commented Apr 23, 2012 at 16:28

Dismissile · Accepted Answer · 2012-04-23 16:26:46Z

4

Can't you just do:

if(thedata.data) {
    $.each(thedata.data, function(){
        $('#theReader').append('<tr class="readerRow"id="new' + index + '"><td align="center"><input type="text" id="reader' + index + '" name="reader' + index + '" value="' + this.readernumber + '" class="readerName"></td></tr>');
                index++;
            });
}

answered Apr 23, 2012 at 16:26

Dismissile

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