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Adapter sync demo: append, prepend and remove (via applyUpdates)
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‎README.md

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Values of the properties can be assigned programmatically. If the range of the index values is known in advance, assigning them programmatically would improve the usability of the scrollBar.
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###Adapter
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### Adapter
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The adapter object is an internal object created for every instance of the scroller. Properties and methods of the adapter can be used to manipulate and assess the scroller the adapter was created for.
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‎demo/adapterSync/adapterSync.html

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<!doctype html>
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<html>
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<head>
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<meta charset="utf-8">
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<title>Adapter sync</title>
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<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.3.14/angular.js"></script>
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<script src="../../dist/ui-scroll.js"></script>
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<script src="adapterSync.js"></script>
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<link rel="stylesheet" href="../css/style.css" type="text/css"/>
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<style>
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.remove {
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float: right;
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margin-right: 15px;
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cursor: pointer;
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}
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.remove:hover {
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color: #a00;
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}
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</style>
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</head>
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<body ng-controller="mainController" ng-app="application">
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<div class="cont cont-global">
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<a class="back" href="../index.html">browse other examples</a>
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<h1 class="page-header page-header-exapmle">Adapter: append, prepend and remove sync</h1>
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<div class="description">
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<p>
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In this demo we are playing with adding/removing items via adapter append, prepend and applyUpdates methods.
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All changes have to be synced and stored on the back end.
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For this purpose a special Server factory was introduced to emulate the remote.
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Some public methods are implemented by this Server factory:<br/>
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<ul>
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<li>
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<em>appendItem(params)</em> to add one new item (based on params) to the end of the remote data set,
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</li>
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<li>
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<em>prependItem(params)</em> to add one new item (based on params) in the beginning of the remote data
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set,
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</li>
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<li>
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<em>removeItemById(id)</em> remove one item (based on id) form the remote data set,
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set,
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</li>
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<li>
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<em>request(index, count)</em> just to fetch a bunch of items for the viewport.
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</li>
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</ul>
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The initial data set consists of 90 items and can be extended unlimitedly.
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</p>
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<p> Follow the sources of the demo! The implementation of the Server factory is not so trivial, it is based on
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indexes variations. Also you may see that new items would not be appended (<em>adapter.append()</em>) to the
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viewport immediately if the EOF (end of file) is not reached. The same is true for prepend operation
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(<em>adapter.prepend()</em>): BOF (begin of file) must be reached, otherwise your new item will be rendered
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only after scrolling to the very top... This is important to build proper UI.
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</p>
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</div>
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<div class="actions">
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<button ng-click="prepend()">Prepend one item</button>
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<button ng-click="append()">Append one item</button>
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<!--button ng-click="removeAll()">Clear the viewport</button-->
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</div>
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<br/>
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<ul class="viewport2" ui-scroll-viewport>
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<li ui-scroll="item in datasource" adapter="adapter">
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<div>
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<span>{{item.content}} <span class="uid">({{item.id}})</span></span>
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<span class="remove" ng-click="remove(item)">[x]</span>
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</div>
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</li>
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</ul>
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</div>
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</body>
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</html>

‎demo/adapterSync/adapterSync.js

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var app = angular.module('application', ['ui.scroll']);
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app.factory('Server', [
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'$timeout', '$q', function ($timeout, $q) {
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var ServerFactory = {
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firstIndex: 1,
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lastIndex: 90,
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delay: 100,
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data: [],
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generateId: function () {
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var d = '-';
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function S4() {
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return (((1 + Math.random()) * 0x10000) | 0).toString(16).substring(1);
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}
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return (S4() + S4() + d + S4() + d + S4() + d + S4() + d + S4() + S4() + S4());
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},
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generateItem: function (number) {
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return {
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index: number,
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id: this.generateId(),
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content: 'Item #' + number
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}
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},
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init: function () {
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for (var i = this.firstIndex; i <= this.lastIndex; i++) {
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this.data.push(this.generateItem(i));
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}
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},
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getItem: function (index) {
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for (var i = this.data.length - 1; i >= 0; i--) {
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if (this.data[i].index === index) {
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return this.data[i];
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}
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}
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},
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returnDeferredResult: function (result) {
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var deferred = $q.defer();
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$timeout(function () {
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deferred.resolve(result);
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}, this.delay);
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return deferred.promise;
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},
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request: function (index, count) {
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var start = index;
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var end = index + count - 1;
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var item, result = {
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items: []
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};
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if (start <= end) {
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for (var i = start; i <= end; i++) {
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if (item = this.getItem(i)) {
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result.items.push(item);
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}
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}
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}
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return this.returnDeferredResult(result);
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},
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prependItem: function (params) {
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var prependedDataIndex = this.firstIndex-- - 1;
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var newItem = this.generateItem(prependedDataIndex);
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newItem.content += params;
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this.data.unshift(newItem);
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return this.returnDeferredResult(newItem);
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},
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appendItem: function (params) {
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var appendedDataIndex = this.lastIndex++ + 1;
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var newItem = this.generateItem(appendedDataIndex);
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newItem.content += params;
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this.data.push(newItem);
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return this.returnDeferredResult(newItem);
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},
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removeItemById: function (itemId) {
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var length = this.data.length;
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for (var i = 0; i < length; i++) {
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if (this.data[i].id === itemId) {
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this.data.splice(i, 1);
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for (var j = i; j < length - 1; j++) {
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this.data[j].index--;
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}
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return this.returnDeferredResult(true);
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}
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}
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return this.returnDeferredResult(false);
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}
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};
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ServerFactory.init();
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return ServerFactory;
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}
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]);
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app.controller('mainController', [
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'$scope', 'Server', function ($scope, Server) {
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$scope.datasource = {
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get: function (index, count, success) {
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console.log('request by index = ' + index + ', count = ' + count);
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Server.request(index, count).then(function (result) {
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if (result.items.length) {
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console.log('resolved ' + result.items.length + ' items');
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}
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success(result.items);
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});
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}
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};
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$scope.prepend = function () {
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Server.prependItem(' ***').then(function (newItem) {
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if ($scope.adapter.isBOF()) {
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$scope.adapter.prepend([newItem]);
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}
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});
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};
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$scope.append = function () {
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Server.appendItem(' ***').then(function (newItem) {
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if ($scope.adapter.isEOF()) {
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$scope.adapter.append([newItem]);
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}
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});
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};
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/*$scope.removeAll = function () {
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$scope.adapter.applyUpdates(function (item) {
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if (item.id) {
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return [];
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}
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});
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};*/
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$scope.remove = function (itemRemove) {
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Server.removeItemById(itemRemove.id).then(function (result) {
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if (result) {
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$scope.adapter.applyUpdates(function (item) {
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if (item.id === itemRemove.id) {
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return [];
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}
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});
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}
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});
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};
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}
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]);

‎demo/append/append.html

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<a class="back" href="../index.html">browse other examples</a>
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<h1 class="page-header page-header-exapmle">Append and prepend demo</h1>
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<h1 class="page-header page-header-exapmle">Adapter: append and prepend sync</h1>
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<div class="description">
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<p>

‎demo/css/style.css

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height: 300px;
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list-style: none;
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padding: 0;
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width: 300px;
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width: 400px;
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}
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.viewport2 .uid {
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font-size: small;
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color: #aaa;
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}
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.viewport {
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margin-top: 15px;

‎demo/css/style.less

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height: 300px;
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list-style: none;
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padding: 0;
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width: 300px;
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width: 400px;
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.uid {
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font-size: small;
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color: #aaa;
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}
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}
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.viewport {

‎demo/index.html

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</li>
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<li>
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<a href="append/append.html">
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Append and prepend sync demo
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Adapter: append and prepend sync demo
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</a>
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</li>
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<li>
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<a href="adapterSync/adapterSync.html">
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Adapter: append, prepend and remove sync demo
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</a>
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</li>
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<li>

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