Solved

problem with for loop

Posted on 2013-10-23
3
168 Views
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])	
		}

Open in new window

0
Comment
Question by:debbieau1
  • 2
3 Comments
 
LVL 30

Accepted Solution

by:
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);
    });
}

Open in new window

0
 
LVL 30

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.
0
 
LVL 1

Author Closing Comment

by:debbieau1
ID: 39595867
Thanks a lot.  Great clear explanation
0

Featured Post

DevOps Toolchain Recommendations

Read this Gartner Research Note and discover how your IT organization can automate and optimize DevOps processes using a toolchain architecture.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Introduction Got endorsements from your clients?  Great!  There is almost nothing better than word-of-mouth advertising.  But how can you do that on the internet?  Sure you can make a page for endorsement quotations and list them all, but who is …
This article discusses how to create an extensible mechanism for linked drop downs.
The viewer will learn how to dynamically set the form action using jQuery.
The viewer will learn the basics of jQuery, including how to invoke it on a web page. Reference your jQuery libraries: (CODE) Include your new external js/jQuery file: (CODE) Write your first lines of code to setup your site for jQuery.: (CODE)

839 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question