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problem with for loop

Posted on 2013-10-23
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Last Modified: 2013-10-23
The code below works, but only if I include an alert.  When i remove the alert, it does not pass the array values through as it should

			var theoption = ["first","second"];
			for (var i=0;i<theoption.length;i++)
				{			
				$.getJSON("testsample?menu="+theoption[i]+"",function(results){
								var options="";
								
								for(resd in results.data)					
								{
									options+="<option value='"+results.data[resd].id+"' >"+results.data[resd].Title+"</option>";
								} 
								$("#"+theoption[i]+"test").html(options);
				});		
				alert(theoption[i])	
		}

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Question by:debbieau1
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3 Comments
 
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Accepted Solution

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Alexandre Simões earned 500 total points
ID: 39593720
Try it like this:
var theoption = ["first", "second"];
for (var i = 0; i < theoption.length; i++) {
    getValues(theoption[i]);
}

function getValues(option){
    $.getJSON("testsample?menu=" + option + "", function (results) {
        var options = "";

        for (resd in results.data) {
            options += "<option value='" + results.data[resd].id + "' >" + results.data[resd].Title + "</option>";
        }
        $("#" + option + "test").html(options);
    });
}

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Expert Comment

by:Alexandre Simões
ID: 39593728
You're having this problem because you're using the loop index inside the ajax callback.
As the callback is asyncronous, when it actually arrives the value of i is no longer the one at request time giving you unexpected results.

The solution above sends the current 'theoption' to the processing function, decoupling the callback process from the loop itself.
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Author Closing Comment

by:debbieau1
ID: 39595867
Thanks a lot.  Great clear explanation
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