Angular: filtering multiple items from array

Question

I'm creating an application where you can filter items by clicking on category buttons. Most items have multiple categories. When pressing on the category buttons, I create an array with the pressed categories.

Each item to be filtered has an array for categories it belongs to. Example:

Item 1 - categories: animal, brown, tail

Item 2 - categories: animal, white

Item 3 - categories: human, tall

When I press on the categories buttons "animal", it shows only items 1 and 2, then when I press on brown, it shows only Item 1. When I deselect all items and press in this order - animal, tail. It doesn't show anything :/

I've looked trough some of the similar topics, but haven't found a solid way of doing this.

Is it possible at all to do it without creating custom filter?

Is there a reason that you don't want a custom filter? This seems like exactly the case for one, and it would be pretty trivial to create. — DRobinson
– DRobinson, Commented Aug 26, 2015 at 13:24
check out this : fdietz.github.io/recipes-with-angular-js/… — Shekhar Khairnar
– Shekhar Khairnar, Commented Aug 26, 2015 at 13:30

DRobinson · Accepted Answer · 2015-08-26 14:28:00Z

1

In case you change your mind about adding a "custom filter", here's one that should work.

angular.module('myApp').filter('matchesAll', function() {
    return function(items, relevant, property) {
        if(!(relevant && relevant.length)){
            return items; // No categories to compare with, return everything
        }

        property = property || 'categories'; // By default look at categories

        return items.filter(function(item) {
            var itemProps = item[property];
            return relevant.every(function(relevantCategory){
                return itemProps.indexOf(relevantCategory) !== -1;
            });
        });
    };
});

This would be used like any ngRepeat filter:

ng-repeat="item in items | matchesAll:selectedCategories"

JSFiddle demonstrating it: http://jsfiddle.net/3an5wr0b/

edited Aug 26, 2015 at 14:28

answered Aug 26, 2015 at 13:42

DRobinson

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10 Comments

yodalr Over a year ago

It seems to throw an error: "TypeError: Cannot read property 'length' of undefined". Closer insepction shows the error here: "if(!relevant && relevant.length){" Also to note, I'm using AngularJS v1.2.9

DRobinson Over a year ago

Sorry, I introduced that error when I lengthened the variable prop to property to make the code clearer. I missed one spot.

yodalr Over a year ago

Hmm, doesn't seem to help, even though I fixed the typo. It's as if it cannot get the value for "relevant".

yodalr Over a year ago

When i do, "return function(items, relevant, property) {console.log(relevant);..." it outputs undefined.

DRobinson Over a year ago

I think you'll find that if you follow the JSFiddle, the example of items (A,B,C) , (B,C), and (A) will match (A,B,C) for selection (A,C). Which is exactly as you just described.

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