Angular UI Grid: How to create a pre-populated dropdown menu for column filtering

Question

I am looking for some help regarding a feature of the Angular UI Grid. Specifically I am exploring filtering and while I was able to successfully implement sorting using free form text field(s) in my application as they do in the example on their site I would like some help finding a way to instead sort using a pre-populated drop-down menu for certain columns.

To clarify: By pre-populated I mean I would like the drop-down to be populated through my code. I am ok if the solution contains hard-coded data but my eventual goal would be to have the pre-population be comprised of the unique data value set of the column being sorted :)

I have seen this functionality in (for example) the Kendo UI (kendodropdownlist) but I am not interested in the price tag that comes along with that solution. I would like to stick with the Angular UI-grid mentioned (and linked) above. On StackOverflow I found one similar question but unfortunately it didn't seem to have gotten much traction. I am hoping that by giving a more detailed explanation of what I am looking for I will receive a more complete answer than I found there.

Here is what is currently in my controller:

var simpleMessagingApp = angular.module('MainAppCtrl', [ 'ngAnimate',
                                                         'ngTouch', 'ui.grid' ]);

simpleMessagingApp.controller('CacheTableCtrl', [ '$scope', '$http',
                                                  'uiGridConstants', function($scope, $http, uiGridConstants) {
    $scope.columns = [ {
        field : 'trans_detail',
        displayName : 'Transaction'
    }, {
        field : 'cust_name',
        displayName : 'Customer'
    }, {
        field : 'quantity',
        displayName : 'Quantity',
        filters : [ {
            condition : uiGridConstants.filter.GREATER_THAN,
            placeholder : 'greater than'
        }, {
            condition : uiGridConstants.filter.LESS_THAN,
            placeholder : 'less than'
        }
        ]
    }, {
        field : 'today_date',
        displayName : 'Current Date'
    } ];
    $scope.gridOptions1 = {
            enableSorting : true,
            enableFiltering : true,
            columnDefs : $scope.columns,
            onRegisterApi : function(gridApi) {
                $scope.grid1Api = gridApi;
            }
    };

    $http.get("../services/Coherence/Cache").success(function(data) {
        $scope.gridOptions1.data = data;
    });

} ]);

Below is the output - with the free-form text fields

For this specific example columns Customer, Quantity, and Current Date I would probably leave as free form drop downs, but I would really like to be able to filter using a pre-populated drop down for the transactions (and to have it in my toolbox for future projects of course!).

Thanks!

Answer 1

You can use the built in selectOptions filter feature documented here: http://ui-grid.info/docs/#/tutorial/103_filtering

Example:

angular.module('exampleApp', ['ui.grid'])
  .controller('exampleCtrl', ['$scope', 'uiGridConstants', function($scope, uiGridConstants) {
    var animals = [
      { id: 1, type: 'Mammal', name: 'Elephant' },
      { id: 2, type: 'Reptile', name: 'Turtle' },
      { id: 3, type: 'Mammal', name: 'Human' }
    ];
                                                          
    var animalTypes = [
      { value: 'Mammal', label: 'Mammal' },
      { value: 'Reptile', label: 'Reptile'}
    ];
  
    $scope.animalGrid = {
      enableFiltering: true,
      columnDefs: [
        {
          name: 'type', 
          field: 'type', 
          filter: { selectOptions: animalTypes, type: uiGridConstants.filter.SELECT }
        },
        { name: 'name', name: 'name'}
      ],
      data: animals
    };
      
  }]);

<link href="http://ui-grid.info/release/ui-grid.css" rel="stylesheet" />
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<script src="http://ui-grid.info/release/ui-grid.js"></script>

<div ng-app="exampleApp">
  <div ng-controller="exampleCtrl">
    <h1>UI Grid Dropdown Filter Example</h1>
    <div ui-grid="animalGrid" class="grid"></div>
  </div>
</div>

Answer 2

You can put a pulldown menu in the header via the headerCellTemplate in your columnDefs

  columnDefs: [
     {field:'myField',headerCellTempalte: 'mypulldowntemplate.html"...}
  ]

mypulldowntemplate.html

  <div ng-class="{ 'sortable': sortable }">
  <div class="ui-grid-vertical-bar">&nbsp;</div>
<div class="ui-grid-cell-contents {{col.headerClass}}" col-index="renderIndex">
    {{ col.displayName CUSTOM_FILTERS }}
    <br>
    <select ng-model="getExternalScopes().value[col.field]" ng-change="$event.stopPropagation();getExternalScopes().yourFilterFunction(col.field)">
    </select>
      
  ....

yourFilterFunction() can do whatever it is you want to have filtered. Perhaps just by setting some variables that you use in a custom filter you assign to the grid. You can find an example of setting a condition in your custom filter on the ui Grid Tutorial here http://ui-grid.info/docs/#/tutorial/103_filtering