filter json from array values with underscore

Question

I have an array of object that is need to create a filter on. The list contains an owner_id property in the JSON...

At the moment im just looping all in the array, however the list should NOT take the ones where owner_id is equal to one of the values in my filterarray:

var filter = "[14657612, 2215375794]";

            $.ajax({
                url: 'myEndPOint',
                dataType: 'json',
                success: function(data) {
                    var media = data.media;
                    var arr = [];

                    _.filter(media, function(val){
                         //The magic should happen here, only return items that has'nt got an val.owner_id that is in "filter" array
                    });

                    for(i=0; i < media.length; i++) {
                        var thumb = media[i].thumbnail;
                        var html = "<li><img src=" + thumb + " /></li>";
                        arr.push(html);
                    }
                    $(".social-ribbon-target").append(arr);
                    $(".loading").css("display", "none");*/

                },
                error: function(error) {
                    console.log("error");
                }
            });

Check this one for reference. stackoverflow.com/a/14339601/3264939 — Kaushik Thanki
– Kaushik Thanki, Commented Feb 3, 2017 at 10:00

Mistalis · Accepted Answer · 2017-02-03 10:02:30Z

0

You defined filter has a string, instead of an array.

Change:

var filter = "[14657612, 2215375794]";

To:

var filter = [14657612, 2215375794];

answered Feb 3, 2017 at 10:02

Mistalis

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Comments

Adam Wolski · Accepted Answer · 2017-02-03 10:16:46Z

0

The magic should happen here

It is actually not magic, but a function that returns true or false whether the item should be in the returned array.

Assuming that your filter is an array and not a string as it is right now (otherwise you have to parse it with filter_arr = JSON.parse(filter)) you may want to write your filtering function like this:

var filter = ["one",  "two", "three"];

var media = [{owner_id: "one"}];

console.log(_.filter(media, function(item){
    return filter.indexOf(item.owner_id) >= 0;
}))

<script src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore-min.js"></script>

edited Feb 3, 2017 at 10:16

answered Feb 3, 2017 at 10:02

Adam Wolski

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4 Comments

hauge Over a year ago

Hmm, but it doesn't match anything? _.filter(media, function(item){ console.log(filter.indexOf(item.owner_id)) return filter.indexOf(item.owner_id) >= 1; }); Even though, some it the items has item.owner_id to be something from the array of filter?

Adam Wolski Over a year ago

Why did you change it to >= 1 ? Have you parsed you string to array accordingly?

hauge Over a year ago

Woop, typing error... However, still, everything returns as false or -1 ?

Adam Wolski Over a year ago

indexOf returns -1 if the element is not present in the array, or index of an element

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