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  • Priority: Medium
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JQuery: Spotty Ajax Performance

Hello all, I have a script I am working on that works fine, but works intermittently. If I put an alert into my function, it is always triggered, but the ajax functions are not always fired. My form has 100 elements; could this be the issue? I have the same problem in IE9 and Firefox.

Performance is also the same whether I call the open_box function or not.

Thanks in advance for any help.


$(function(){
		$.ajaxSetup ({cache: false});
		$("table.locations-grid tr.data-row td").delegate(":button[name=transfer]","click",function(){	
			$("#transferForm :input[type=checkbox]").not(':checked').parent().prev().children("select").attr('disabled',true);
			$("#transferForm :input[type=checkbox]").not(':checked').attr('disabled',true);
			if ( $("table.locations-grid tr.data-row td :input[type=checkbox]:checked").length > 0 ){			
				$("table.locations-grid tr.data-row td :button[name=transfer]").attr("disabled", true);
				$(":input[type=checkbox][name=checkall]").prop("checked", false);
					$.post('ajax.php', $("#transferForm").serialize()+'&type=transfer' ,function(data){			
							$.each(data,function(key,value){
								$("#"+value['ItemId']+" td:nth-child(9)").html(value['Status']);
								$("#"+value['ItemId']+" td:nth-child(10) , #"+value['ItemId']+" td:nth-child(11)").html('');
							});
						open_box('http://127.0.0.1/design/ajax2.php',{'table': 'WhTransfers', 'type': 'showTransfer', 'id': data['0']['ParentId']} ,'910');			
				},"json");
			$("table.locations-grid tr.data-row td :button[name=transfer]").removeAttr("disabled");	
			$("#transferForm :input[type=checkbox]").parent().prev().children("select").removeAttr('disabled');
			$("#transferForm :input[type=checkbox]").removeAttr('disabled');		
			}
		});
		if ( $('body > table.locations-grid').size() > 1 ){
			$(":input[type=button]").remove(); 
			alert('Trying to load multiple grids - loss of database table scope.');
			return false;
		}else{	
			if ( $("table.locations-grid").attr('id') ){
				var table=$("table.locations-grid").attr('id');
			}
		}
		$(":input[type=checkbox][name=checkall]").click(function(){
			var nth=($(this).parent().index()+1);
			$(this).parent().parent().parent().children("tr").children("td:nth-child("+nth+")").children(":input[type=checkbox]").attr('checked',this.checked);
		});

	});

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Candidochris
Asked:
Candidochris
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1 Solution
 
Michel PlungjanIT ExpertCommented:
Cannot see why the ajax would be spotty - do you make concurrent ajax calls that might interfere with each other?

In any case I suggest - especially sine you seem to have a large DOM - to cache the elements
$("table.locations-grid tr.data-row td").delegate(":button[name=transfer]","click",function(){  
      var chk = $("#transferForm :input[type=checkbox]").not(':checked');
      var sel = chk.parent().prev().children("select");
      var but = $("table.locations-grid tr.data-row td :button[name=transfer]"); 
      sel.attr('disabled',true);
      chk.attr('disabled',true);
      if ( $("table.locations-grid tr.data-row td :input[type=checkbox]:checked").length > 0 ){      
        but.attr("disabled", true);
        $(":input[type=checkbox][name=checkall]").prop("checked", false);
          $.post('ajax.php', $("#transferForm").serialize()+'&type=transfer' ,function(data){      
              $.each(data,function(key,value){
                $("#"+value['ItemId']+" td:nth-child(9)").html(value['Status']);
                $("#"+value['ItemId']+" td:nth-child(10) , #"+value['ItemId']+" td:nth-child(11)").html('');
              });
            open_box('http://127.0.0.1/design/ajax2.php',{'table': 'WhTransfers', 'type': 'showTransfer', 'id': data['0']['ParentId']} ,'910');      
        },"json");
      but.removeAttr("disabled");  
      sel.removeAttr('disabled');
      chk.removeAttr('disabled');    
      }
    });

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CandidochrisAuthor Commented:
Its a single call but it alters my database  so I don't think caching is an option because each call is unique.
0
 
Michel PlungjanIT ExpertCommented:
Caching the DOM elements. My changes did nothing to the ajax but traverses the dom less often than your code which ran over the table several times to get the checkbox the select and the button
0
 
CandidochrisAuthor Commented:
Ah, that makes great sense and solved my problem.

Thanks!
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