Angular - Filter to remove blank strings from array

Question

I have an object of arrays... The array can contain blanks, how can i create an ANgular filter to remove the blanks to determine the length of the array?

$scope.myData = {
    ["1", "1", "4", "4", "N", "4", "6", "8", "", "", "", "", "", "", "", "", "", "", ],
    ["2", "2", "4", "6", "0", "6", "5", "4", "2", "", "8", "", "", "", "", "", "", "", ],
    ["2", "3", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", ],
    ["3", "F", "D", "3", "5", "1", "D", "5", "", "", "", "", "", "", "", "", "", "", ],
    ["1", "V", "4", "4", "3", "2", "1", "1", "4", "", "", "", "", "", "", "", "", "", ],
    ["4", "5", "8", "6", "4", "2", "8", "7", "1", "1", "2", "", "", "", "", "", "", "", ],
    ["4", "4", "R", "F", "D", "8", "4", "2", "4", "8", "7", "4", "8", "", "", "", "", "", ],
    ["D", "5", "F", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", ],
    ["1", "4", "1", "3", "4", "B", "D", "G", "", "", "", "", "", "", "", "", "", "", ]
}

HTML:

<div ng-repeat="data in myData">
    <div ng-show="(data | myFilter).length > 10">
        Show if length greater than 10
    </div>


    <div ng-show="(data | myFilter).length > 15">
        Show if length greater than 15
    </div>
</div>

Thanks

Ceasar

docs.angularjs.org/guide/filter has a section called "Creating custom filters". Read it, and implement your filter. – Rationality

And, just for the record, your object is invalid. – Eventuate

Answer 1

var app = angular.module('app', []);
app.filter('myFilter', function() {

  return function(input) {
    var newInput = [];
    angular.forEach(input, function(item) {
      console.log(item);
      if (item != "") newInput.push(item);
    });
    return newInput;
  };
});


app.controller('fCtrl', function($scope) {

  $scope.myData = [
    ["1", "1", "4", "4", "N", "4", "6", "8", "", "", "", "", "", "", "", "", "", ""],
    ["2", "2", "4", "6", "0", "6", "5", "4", "2", "", "8", "", "", "", "", "", "", ""],
    ["2", "3", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", ""],
    ["3", "F", "D", "3", "5", "1", "D", "5", "", "", "", "", "", "", "", "", "", ""],
    ["1", "V", "4", "4", "3", "2", "1", "1", "4", "", "", "", "", "", "", "", "", ""],
    ["4", "5", "8", "6", "4", "2", "8", "7", "1", "1", "2", "", "", "", "", "", "", ""],
    ["4", "4", "R", "F", "D", "8", "4", "2", "4", "8", "7", "4", "8", "", "", "", "", ""],
    ["D", "5", "F", "", "", "", "", "", "", "", "", "", "", "", "", "", "", ""],
    ["1", "4", "1", "3", "4", "B", "D", "G", "", "", "", "", "", "", "", "", "", ""]
  ];




});

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>

<div ng-app="app">
  <div ng-controller="fCtrl">

    <div ng-repeat="data in myData ">
      <span>{{data | myFilter }}</span>
      <div ng-show="(data | myFilter).length > 10">
        Show if length greater than 10
      </div>


      <div ng-show="(data | myFilter).length > 15">
        Show if length greater than 15
      </div>
      <hr/>
    </div>
  </div>
</div>

Hamsun

One suggestion to make this code smaller: Inside of myFilter, you can simplify this a good deal, using angular's preexisting $filter. return $filter('filter')(input, '!', true); instead of the whole forEach, etc. (the '!' means a negated "match empty string", and the final true argument means strict string matching) – Barone

Answer 2

Use this link https://github.com/a8m/angular-filter

It gives you a number of ways to filter whatever you need in any format.It also has examples along with each filter.

Cano

An example on how to do this using that library would be a more constructive answer. – Napiform

Answer 3

At first I want to note, that your JS object is invalid.

Please, use the array of arrays instead of object of arrays in this case.

$scope.myData = [
   ["1", "2", "3", "4", "5", "6", "7", "8", "9", "", "", "", "", "", "", "", "", "" ],
   ["1", "2", "3", "4", "5", "6", "7", "8", "", "", "", "", "", "", "", "", "", "" ],
   ["1", "2", "3", "4", "5", "6", "7", "", "", "", "", "", "", "", "", "", "", "" ],
   ["1", "2", "3", "4", "5", "6", "", "", "", "", "", "", "", "", "", "", "", "" ]
];

And secondly i've created filter to remove the blank items.

.filter('removeBlankItems', function() {
    return function(inputArray) {
      var outArray = [];
      for (var i = 0; i < inputArray.length; i++) {
          if(inputArray[i].length != 0){
             outArray.push(inputArray[i]);     
          }
      }
      return outArray;
    };
})

This is JSFiddle with working example.

Izawa

Answer 4

The other answers didn't work for me and angular-filter doesn't have any specific abilities for this case, but the following worked in my Angular app. No custom filter needed.

arr = ["", "foo", "bar"];
arr.filter(Boolean);

Browser compatability: http://kangax.github.io/compat-table/es5/#Array.prototype.filter

Lantern