How to re-label Object in array?

Question

Extending a previous question about JavaScript and jQuery, I'm trying to make an array and then look into it, but the array contains dimensions and I can't get it right..

var markers = [];
$.getJSON('GetList', "id"= + data.id,
        function(data){
           $.each(data.list, function(index, data) {
                }
                markers.push( {
                    category:data.category,
                    id:data.id,
                    location:{
                        latitude:data.location.latitude,
                        longitude:data.location.longitude
                    }
                });
            });
        });
        return markers;
}

The first thing that strikes me is that every item will now be called "Object", while default, I'm still wondering if they can be labeled instead?

Further down the line, I try to access the id to compare it to a selection by the user, but it doesn't work.

    var selection = $(div_id).val();
    var arr = $.inArray(selection, markersArray.id);
    if( arr >= 0) {
        return search(selection, div_id);
    } else {
        throw("selection not found in selectionSearch()");
    }

What am I doing wrong here..?

SLaks · Accepted Answer · 2010-09-06 13:23:27Z

1

To label the objects, add a toString function, like this:

            markers.push({
                toString: function () { return this.something; },
                category:data.category,
                id:data.id,
                location:{
                    latitude:data.location.latitude,
                    longitude:data.location.longitude
                }
            });

To search the array, you'll need your own loop.
jQuery's $.inArray function searches the array for an exact match; it cannot be used to find an object with a matching property.
You can find a match yourself, like this:

for(var i = 0; i < markers.length; i++) {
    if (markers[i].id === selection)
        return search(selection, div_id);
}
throw("selection not found in selectionSearch()");

edited Sep 6, 2010 at 13:23

answered Sep 6, 2010 at 13:07

SLaks

891k182 gold badges1.9k silver badges2k bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

M.E Over a year ago

First of all - the toString example contains faults (rogue parentheses?) Second - shouldn't it be possible to just label the objects after data.id and find it with $.inArray?

M.E Over a year ago

Well, it works like you did it so, no arguments there. However I ran into "a is null" with it which is ... such a great error...

Guffa · Accepted Answer · 2010-09-06 13:29:01Z

0

The type of each item is Object, there is nothing strange about that. There is no reason to try to change that.

To filter out items from an array based on a property in the item, you use the grep method:

var arr = $.grep(markers, function(e){ return e.id === selection; });

To check if the array is empty, you don't compare the array to a number, you use the length property:

if (arr.length > 0) {

answered Sep 6, 2010 at 13:29

Guffa

703k111 gold badges760 silver badges1k bronze badges

Collectives™ on Stack Overflow

How to re-label Object in array?

2 Answers 2

2 Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

2 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related