Angular Material – Virtual Repeat


Angular Material – Virtual Repeat

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The md-virtual-repeat-container is the scroll container for the md-virtual-repeat component.

Attributes

The following table lists out the parameters and description of the different attributes of md-virtual-repeat-container.

Sr.No Parameter & Description
1

md-top-index

Binds the index of the item that is at the top of the scroll container to $scope. It can both read and set the scroll position.
2

md-orient-horizontal

Determines whether the container should scroll horizontally (defaults to orientation and scrolling vertically).
3

md-auto-shrink

When present, the container will shrink to fit the number of items when that number is less than its original size.
4

md-auto-shrink-min

Minimum number of items that md-auto-shrink will shrink to (default: 0).

md-virtual-repeat

Virtual repeat is a substitute for ng-repeat to renders only enough html elements to fill the container and reuse them when the user scrolls.

Attributes

The following table lists out the parameters and description of the different attributes of md-virtual-repeat.

Sr.No Parameter & Description
1

md-item-size

The height or width of the repeated elements (which must be identical for each element). This is optional. This attempts to read the size from the dom if missing, but still assumes that all repeated nodes have same height or width.
2

md-extra-name

Evaluates to an additional name to which the current iterated item can be assigned on the repeated scope (needed for use in md-autocomplete).
3

md-on-demand

When present, treats the md-virtual-repeat argument as an object that can fetch rows rather than an array.This object must implement the following interface with two (2) methods −

  • getItemAtIndex − function(index) [object] – The item at that index or null if it is not yet loaded (it should start downloading the item in that case).

  • getLength − function() [number] – The data length to which the repeater container should be sized. Ideally, when the count is known, this method should return it. Otherwise, return a higher number than the currently loaded items to produce an infinite-scroll behavior.

Example

The following example show the use of virtual repeat.

am_virtualrepeat.htm

Live Demo 
<html lang = "en">
   <head>
      <link rel = "stylesheet"
         href = "https://ajax.googleapis.com/ajax/libs/angular_material/1.0.0/angular-material.min.css">
      <script src = "https://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular.min.js"></script>
      <script src = "https://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular-animate.min.js"></script>
      <script src = "https://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular-aria.min.js"></script>
      <script src = "https://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular-messages.min.js"></script>
      <script src = "https://ajax.googleapis.com/ajax/libs/angular_material/1.0.0/angular-material.min.js"></script>
      <link rel = "stylesheet" href = "https://fonts.googleapis.com/icon?family=Material+Icons">
      
      <style>
         .vrepeatContainer #horizontal-container {
            height: 100px;
            width: 830px; 
         }

         .vrepeatContainer #vertical-container {
            height: 292px;
            width: 400px; 
         }

         .vrepeatContainer .repeated-item-horizontal {
            border-right: 1px solid #ddd;
            box-sizing: border-box;
            display: inline-block;
            height: 84px;
            padding-top: 35px;
            text-align: center;
            width: 50px; 
         }

         .vrepeatContainer .repeated-item-vertical {
            border-bottom: 1px solid #ddd;
            box-sizing: border-box;
            height: 40px;
            padding-top: 10px;
         }

         .vrepeatContainer md-content {
            margin: 16px; 
         }
         
         .vrepeatContainer md-virtual-repeat-container {
            border: solid 1px grey; 
         }	  
      </style>
      
      <script language = "javascript">
         angular
            .module(''firstApplication'', [''ngMaterial''])
            .controller(''vrepeatController'', vrepeatController);
           
         function vrepeatController ($scope) { 
            this.items = [];
            for (var i = 0; i < 1000; i++) {
               this.items.push(i);
            }
         }	  
      </script>      
   </head>
   
   <body ng-app = "firstApplication"> 
      <div class = "vrepeatContainer" ng-controller = "vrepeatController as ctrl"
         ng-cloak>
         <md-content layout = "column">
            <h2>Horizontal Repeat</h2>
            <md-virtual-repeat-container id = "horizontal-container" md-orient-horizontal>
               <div md-virtual-repeat = "item in ctrl.items"
                  class = "repeated-item-horizontal" flex>
                  {{item}}
               </div>
            </md-virtual-repeat-container>
            
            <h2>Vertical Repeat</h2>
            <md-virtual-repeat-container id = "vertical-container">
               <div md-virtual-repeat = "item in ctrl.items"
                  class = "repeated-item-vertical" flex>
                  {{item}}
               </div>
            </md-virtual-repeat-container>
            
         </md-content>
      </div>
   </body>
</html>

Result

Verify the result.