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+Sencha Documentation Project/**
+ * @class Ext.toolbar.Paging
+ * @extends Ext.toolbar.Toolbar
+ * <p>As the amount of records increases, the time required for the browser to render
+ * them increases. Paging is used to reduce the amount of data exchanged with the client.
+ * Note: if there are more records/rows than can be viewed in the available screen area, vertical
+ * scrollbars will be added.</p>
+ * <p>Paging is typically handled on the server side (see exception below). The client sends
+ * parameters to the server side, which the server needs to interpret and then respond with the
+ * appropriate data.</p>
+ * <p><b>Ext.toolbar.Paging</b> is a specialized toolbar that is bound to a {@link Ext.data.Store}
+ * and provides automatic paging control. This Component {@link Ext.data.Store#load load}s blocks
+ * of data into the <tt>{@link #store}</tt> by passing {@link Ext.data.Store#paramNames paramNames} used for
+ * paging criteria.</p>
+ *
+ * {@img Ext.toolbar.Paging/Ext.toolbar.Paging.png Ext.toolbar.Paging component}
+ *
+ * <p>PagingToolbar is typically used as one of the Grid's toolbars:</p>
+ * <pre><code>
+ * var itemsPerPage = 2; // set the number of items you want per page
+ *
+ * var store = Ext.create('Ext.data.Store', {
+ * id:'simpsonsStore',
+ * autoLoad: false,
+ * fields:['name', 'email', 'phone'],
+ * pageSize: itemsPerPage, // items per page
+ * proxy: {
+ * type: 'ajax',
+ * url: 'pagingstore.js', // url that will load data with respect to start and limit params
+ * reader: {
+ * type: 'json',
+ * root: 'items',
+ * totalProperty: 'total'
+ * }
+ * }
+ * });
+ *
+ * // specify segment of data you want to load using params
+ * store.load({
+ * params:{
+ * start:0,
+ * limit: itemsPerPage
+ * }
+ * });
+ *
+ * Ext.create('Ext.grid.Panel', {
+ * title: 'Simpsons',
+ * store: store,
+ * columns: [
+ * {header: 'Name', dataIndex: 'name'},
+ * {header: 'Email', dataIndex: 'email', flex:1},
+ * {header: 'Phone', dataIndex: 'phone'}
+ * ],
+ * width: 400,
+ * height: 125,
+ * dockedItems: [{
+ * xtype: 'pagingtoolbar',
+ * store: store, // same store GridPanel is using
+ * dock: 'bottom',
+ * displayInfo: true
+ * }],
+ * renderTo: Ext.getBody()
+ * });
+ * </code></pre>
+ *
+ * <p>To use paging, pass the paging requirements to the server when the store is first loaded.</p>
+ * <pre><code>
+store.load({
+ params: {
+ // specify params for the first page load if using paging
+ start: 0,
+ limit: myPageSize,
+ // other params
+ foo: 'bar'
+ }
+});
+ * </code></pre>
+ *
+ * <p>If using {@link Ext.data.Store#autoLoad store's autoLoad} configuration:</p>
+ * <pre><code>
+var myStore = new Ext.data.Store({
+ {@link Ext.data.Store#autoLoad autoLoad}: {start: 0, limit: 25},
+ ...
+});
+ * </code></pre>
+ *
+ * <p>The packet sent back from the server would have this form:</p>
+ * <pre><code>
+{
+ "success": true,
+ "results": 2000,
+ "rows": [ // <b>*Note:</b> this must be an Array
+ { "id": 1, "name": "Bill", "occupation": "Gardener" },
+ { "id": 2, "name": "Ben", "occupation": "Horticulturalist" },
+ ...
+ { "id": 25, "name": "Sue", "occupation": "Botanist" }
+ ]
+}
+ * </code></pre>
+ * <p><u>Paging with Local Data</u></p>
+ * <p>Paging can also be accomplished with local data using extensions:</p>
+ * <div class="mdetail-params"><ul>
+ * <li><a href="http://sencha.com/forum/showthread.php?t=71532">Ext.ux.data.PagingStore</a></li>
+ * <li>Paging Memory Proxy (examples/ux/PagingMemoryProxy.js)</li>
+ * </ul></div>
+ * @constructor Create a new PagingToolbar
+ * @param {Object} config The config object
+ * @xtype pagingtoolbar
+ */
+Ext.define('Ext.toolbar.Paging', {
+ extend: 'Ext.toolbar.Toolbar',
+ alias: 'widget.pagingtoolbar',
+ alternateClassName: 'Ext.PagingToolbar',
+ requires: ['Ext.toolbar.TextItem', 'Ext.form.field.Number'],
+ /**
+ * @cfg {Ext.data.Store} store
+ * The {@link Ext.data.Store} the paging toolbar should use as its data source (required).
+ */
+ /**
+ * @cfg {Boolean} displayInfo
+ * <tt>true</tt> to display the displayMsg (defaults to <tt>false</tt>)
+ */
+ displayInfo: false,
+ /**
+ * @cfg {Boolean} prependButtons
+ * <tt>true</tt> to insert any configured <tt>items</tt> <i>before</i> the paging buttons.
+ * Defaults to <tt>false</tt>.
+ */
+ prependButtons: false,
+ /**
+ * @cfg {String} displayMsg
+ * The paging status message to display (defaults to <tt>'Displaying {0} - {1} of {2}'</tt>).
+ * Note that this string is formatted using the braced numbers <tt>{0}-{2}</tt> as tokens
+ * that are replaced by the values for start, end and total respectively. These tokens should
+ * be preserved when overriding this string if showing those values is desired.
+ */
+ displayMsg : 'Displaying {0} - {1} of {2}',
+ /**
+ * @cfg {String} emptyMsg
+ * The message to display when no records are found (defaults to 'No data to display')
+ */
+ emptyMsg : 'No data to display',
+ /**
+ * @cfg {String} beforePageText
+ * The text displayed before the input item (defaults to <tt>'Page'</tt>).
+ */
+ beforePageText : 'Page',
+ /**
+ * @cfg {String} afterPageText
+ * Customizable piece of the default paging text (defaults to <tt>'of {0}'</tt>). Note that
+ * this string is formatted using <tt>{0}</tt> as a token that is replaced by the number of
+ * total pages. This token should be preserved when overriding this string if showing the
+ * total page count is desired.
+ */
+ afterPageText : 'of {0}',
+ /**
+ * @cfg {String} firstText
+ * The quicktip text displayed for the first page button (defaults to <tt>'First Page'</tt>).
+ * <b>Note</b>: quick tips must be initialized for the quicktip to show.
+ */
+ firstText : 'First Page',
+ /**
+ * @cfg {String} prevText
+ * The quicktip text displayed for the previous page button (defaults to <tt>'Previous Page'</tt>).
+ * <b>Note</b>: quick tips must be initialized for the quicktip to show.
+ */
+ prevText : 'Previous Page',
+ /**
+ * @cfg {String} nextText
+ * The quicktip text displayed for the next page button (defaults to <tt>'Next Page'</tt>).
+ * <b>Note</b>: quick tips must be initialized for the quicktip to show.
+ */
+ nextText : 'Next Page',
+ /**
+ * @cfg {String} lastText
+ * The quicktip text displayed for the last page button (defaults to <tt>'Last Page'</tt>).
+ * <b>Note</b>: quick tips must be initialized for the quicktip to show.
+ */
+ lastText : 'Last Page',
+ /**
+ * @cfg {String} refreshText
+ * The quicktip text displayed for the Refresh button (defaults to <tt>'Refresh'</tt>).
+ * <b>Note</b>: quick tips must be initialized for the quicktip to show.
+ */
+ refreshText : 'Refresh',
+ /**
+ * @cfg {Number} inputItemWidth
+ * The width in pixels of the input field used to display and change the current page number (defaults to 30).
+ */
+ inputItemWidth : 30,
+
+ /**
+ * Gets the standard paging items in the toolbar
+ * @private
+ */
+ getPagingItems: function() {
+ var me = this;
+
+ return [{
+ itemId: 'first',
+ tooltip: me.firstText,
+ overflowText: me.firstText,
+ iconCls: Ext.baseCSSPrefix + 'tbar-page-first',
+ disabled: true,
+ handler: me.moveFirst,
+ scope: me
+ },{
+ itemId: 'prev',
+ tooltip: me.prevText,
+ overflowText: me.prevText,
+ iconCls: Ext.baseCSSPrefix + 'tbar-page-prev',
+ disabled: true,
+ handler: me.movePrevious,
+ scope: me
+ },
+ '-',
+ me.beforePageText,
+ {
+ xtype: 'numberfield',
+ itemId: 'inputItem',
+ name: 'inputItem',
+ cls: Ext.baseCSSPrefix + 'tbar-page-number',
+ allowDecimals: false,
+ minValue: 1,
+ hideTrigger: true,
+ enableKeyEvents: true,
+ selectOnFocus: true,
+ submitValue: false,
+ width: me.inputItemWidth,
+ margins: '-1 2 3 2',
+ listeners: {
+ scope: me,
+ keydown: me.onPagingKeyDown,
+ blur: me.onPagingBlur
+ }
+ },{
+ xtype: 'tbtext',
+ itemId: 'afterTextItem',
+ text: Ext.String.format(me.afterPageText, 1)
+ },
+ '-',
+ {
+ itemId: 'next',
+ tooltip: me.nextText,
+ overflowText: me.nextText,
+ iconCls: Ext.baseCSSPrefix + 'tbar-page-next',
+ disabled: true,
+ handler: me.moveNext,
+ scope: me
+ },{
+ itemId: 'last',
+ tooltip: me.lastText,
+ overflowText: me.lastText,
+ iconCls: Ext.baseCSSPrefix + 'tbar-page-last',
+ disabled: true,
+ handler: me.moveLast,
+ scope: me
+ },
+ '-',
+ {
+ itemId: 'refresh',
+ tooltip: me.refreshText,
+ overflowText: me.refreshText,
+ iconCls: Ext.baseCSSPrefix + 'tbar-loading',
+ handler: me.doRefresh,
+ scope: me
+ }];
+ },
+
+ initComponent : function(){
+ var me = this,
+ pagingItems = me.getPagingItems(),
+ userItems = me.items || me.buttons || [];
+
+ if (me.prependButtons) {
+ me.items = userItems.concat(pagingItems);
+ } else {
+ me.items = pagingItems.concat(userItems);
+ }
+ delete me.buttons;
+
+ if (me.displayInfo) {
+ me.items.push('->');
+ me.items.push({xtype: 'tbtext', itemId: 'displayItem'});
+ }
+
+ me.callParent();
+
+ me.addEvents(
+ /**
+ * @event change
+ * Fires after the active page has been changed.
+ * @param {Ext.toolbar.Paging} this
+ * @param {Object} pageData An object that has these properties:<ul>
+ * <li><code>total</code> : Number <div class="sub-desc">The total number of records in the dataset as
+ * returned by the server</div></li>
+ * <li><code>currentPage</code> : Number <div class="sub-desc">The current page number</div></li>
+ * <li><code>pageCount</code> : Number <div class="sub-desc">The total number of pages (calculated from
+ * the total number of records in the dataset as returned by the server and the current {@link #pageSize})</div></li>
+ * <li><code>toRecord</code> : Number <div class="sub-desc">The starting record index for the current page</div></li>
+ * <li><code>fromRecord</code> : Number <div class="sub-desc">The ending record index for the current page</div></li>
+ * </ul>
+ */
+ 'change',
+ /**
+ * @event beforechange
+ * Fires just before the active page is changed.
+ * Return false to prevent the active page from being changed.
+ * @param {Ext.toolbar.Paging} this
+ * @param {Number} page The page number that will be loaded on change
+ */
+ 'beforechange'
+ );
+ me.on('afterlayout', me.onLoad, me, {single: true});
+
+ me.bindStore(me.store, true);
+ },
+ // private
+ updateInfo : function(){
+ var me = this,
+ displayItem = me.child('#displayItem'),
+ store = me.store,
+ pageData = me.getPageData(),
+ count, msg;
+
+ if (displayItem) {
+ count = store.getCount();
+ if (count === 0) {
+ msg = me.emptyMsg;
+ } else {
+ msg = Ext.String.format(
+ me.displayMsg,
+ pageData.fromRecord,
+ pageData.toRecord,
+ pageData.total
+ );
+ }
+ displayItem.setText(msg);
+ me.doComponentLayout();
+ }
+ },
+
+ // private
+ onLoad : function(){
+ var me = this,
+ pageData,
+ currPage,
+ pageCount,
+ afterText;
+
+ if (!me.rendered) {
+ return;
+ }
+
+ pageData = me.getPageData();
+ currPage = pageData.currentPage;
+ pageCount = pageData.pageCount;
+ afterText = Ext.String.format(me.afterPageText, isNaN(pageCount) ? 1 : pageCount);
+
+ me.child('#afterTextItem').setText(afterText);
+ me.child('#inputItem').setValue(currPage);
+ me.child('#first').setDisabled(currPage === 1);
+ me.child('#prev').setDisabled(currPage === 1);
+ me.child('#next').setDisabled(currPage === pageCount);
+ me.child('#last').setDisabled(currPage === pageCount);
+ me.child('#refresh').enable();
+ me.updateInfo();
+ me.fireEvent('change', me, pageData);
+ },
+
+ // private
+ getPageData : function(){
+ var store = this.store,
+ totalCount = store.getTotalCount();
+
+ return {
+ total : totalCount,
+ currentPage : store.currentPage,
+ pageCount: Math.ceil(totalCount / store.pageSize),
+ //pageCount : store.getPageCount(),
+ fromRecord: ((store.currentPage - 1) * store.pageSize) + 1,
+ toRecord: Math.min(store.currentPage * store.pageSize, totalCount)
+
+ };
+ },
+
+ // private
+ onLoadError : function(){
+ if (!this.rendered) {
+ return;
+ }
+ this.child('#refresh').enable();
+ },
+
+ // private
+ readPageFromInput : function(pageData){
+ var v = this.child('#inputItem').getValue(),
+ pageNum = parseInt(v, 10);
+
+ if (!v || isNaN(pageNum)) {
+ this.child('#inputItem').setValue(pageData.currentPage);
+ return false;
+ }
+ return pageNum;
+ },
+
+ onPagingFocus : function(){
+ this.child('#inputItem').select();
+ },
+
+ //private
+ onPagingBlur : function(e){
+ var curPage = this.getPageData().currentPage;
+ this.child('#inputItem').setValue(curPage);
+ },
+
+ // private
+ onPagingKeyDown : function(field, e){
+ var k = e.getKey(),
+ pageData = this.getPageData(),
+ increment = e.shiftKey ? 10 : 1,
+ pageNum,
+ me = this;
+
+ if (k == e.RETURN) {
+ e.stopEvent();
+ pageNum = me.readPageFromInput(pageData);
+ if (pageNum !== false) {
+ pageNum = Math.min(Math.max(1, pageNum), pageData.total);
+ if(me.fireEvent('beforechange', me, pageNum) !== false){
+ me.store.loadPage(pageNum);
+ }
+ }
+ } else if (k == e.HOME || k == e.END) {
+ e.stopEvent();
+ pageNum = k == e.HOME ? 1 : pageData.pageCount;
+ field.setValue(pageNum);
+ } else if (k == e.UP || k == e.PAGEUP || k == e.DOWN || k == e.PAGEDOWN) {
+ e.stopEvent();
+ pageNum = me.readPageFromInput(pageData);
+ if (pageNum) {
+ if (k == e.DOWN || k == e.PAGEDOWN) {
+ increment *= -1;
+ }
+ pageNum += increment;
+ if (pageNum >= 1 && pageNum <= pageData.pages) {
+ field.setValue(pageNum);
+ }
+ }
+ }
+ },
+
+ // private
+ beforeLoad : function(){
+ if(this.rendered && this.refresh){
+ this.refresh.disable();
+ }
+ },
+
+ // private
+ doLoad : function(start){
+ if(this.fireEvent('beforechange', this, o) !== false){
+ this.store.load();
+ }
+ },
+
+ /**
+ * Move to the first page, has the same effect as clicking the 'first' button.
+ */
+ moveFirst : function(){
+ var me = this;
+ if(me.fireEvent('beforechange', me, 1) !== false){
+ me.store.loadPage(1);
+ }
+ },
+
+ /**
+ * Move to the previous page, has the same effect as clicking the 'previous' button.
+ */
+ movePrevious : function(){
+ var me = this,
+ prev = me.store.currentPage - 1;
+
+ if(me.fireEvent('beforechange', me, prev) !== false){
+ me.store.previousPage();
+ }
+ },
+
+ /**
+ * Move to the next page, has the same effect as clicking the 'next' button.
+ */
+ moveNext : function(){
+ var me = this;
+ if(me.fireEvent('beforechange', me, me.store.currentPage + 1) !== false){
+ me.store.nextPage();
+ }
+ },
+
+ /**
+ * Move to the last page, has the same effect as clicking the 'last' button.
+ */
+ moveLast : function(){
+ var me = this,
+ last = this.getPageData().pageCount;
+
+ if(me.fireEvent('beforechange', me, last) !== false){
+ me.store.loadPage(last);
+ }
+ },
+
+ /**
+ * Refresh the current page, has the same effect as clicking the 'refresh' button.
+ */
+ doRefresh : function(){
+ var me = this,
+ current = me.store.currentPage;
+
+ if(me.fireEvent('beforechange', me, current) !== false){
+ me.store.loadPage(current);
+ }
+ },
+
+ /**
+ * Binds the paging toolbar to the specified {@link Ext.data.Store}
+ * @param {Store} store The store to bind to this toolbar
+ * @param {Boolean} initial (Optional) true to not remove listeners
+ */
+ bindStore : function(store, initial){
+ var me = this;
+
+ if (!initial && me.store) {
+ if(store !== me.store && me.store.autoDestroy){
+ me.store.destroy();
+ }else{
+ me.store.un('beforeload', me.beforeLoad, me);
+ me.store.un('load', me.onLoad, me);
+ me.store.un('exception', me.onLoadError, me);
+ }
+ if(!store){
+ me.store = null;
+ }
+ }
+ if (store) {
+ store = Ext.data.StoreManager.lookup(store);
+ store.on({
+ scope: me,
+ beforeload: me.beforeLoad,
+ load: me.onLoad,
+ exception: me.onLoadError
+ });
+ }
+ me.store = store;
+ },
+
+ /**
+ * Unbinds the paging toolbar from the specified {@link Ext.data.Store} <b>(deprecated)</b>
+ * @param {Ext.data.Store} store The data store to unbind
+ */
+ unbind : function(store){
+ this.bindStore(null);
+ },
+
+ /**
+ * Binds the paging toolbar to the specified {@link Ext.data.Store} <b>(deprecated)</b>
+ * @param {Ext.data.Store} store The data store to bind
+ */
+ bind : function(store){
+ this.bindStore(store);
+ },
+
+ // private
+ onDestroy : function(){
+ this.bindStore(null);
+ this.callParent();
+ }
+});
+
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