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10 * Ext JS Library 3.3.1
11 * Copyright(c) 2006-2010 Sencha Inc.
12 * licensing@sencha.com
13 * http://www.sencha.com/license
15 <div id="cls-Ext.PagingToolbar"></div>/**
16 * @class Ext.PagingToolbar
17 * @extends Ext.Toolbar
18 * <p>As the amount of records increases, the time required for the browser to render
19 * them increases. Paging is used to reduce the amount of data exchanged with the client.
20 * Note: if there are more records/rows than can be viewed in the available screen area, vertical
21 * scrollbars will be added.</p>
22 * <p>Paging is typically handled on the server side (see exception below). The client sends
23 * parameters to the server side, which the server needs to interpret and then respond with the
24 * approprate data.</p>
25 * <p><b>Ext.PagingToolbar</b> is a specialized toolbar that is bound to a {@link Ext.data.Store}
26 * and provides automatic paging control. This Component {@link Ext.data.Store#load load}s blocks
27 * of data into the <tt>{@link #store}</tt> by passing {@link Ext.data.Store#paramNames paramNames} used for
28 * paging criteria.</p>
29 * <p>PagingToolbar is typically used as one of the Grid's toolbars:</p>
31 Ext.QuickTips.init(); // to display button quicktips
33 var myStore = new Ext.data.Store({
34 reader: new Ext.data.JsonReader({
35 {@link Ext.data.JsonReader#totalProperty totalProperty}: 'results',
41 var myPageSize = 25; // server script should only send back 25 items at a time
43 var grid = new Ext.grid.GridPanel({
46 bbar: new Ext.PagingToolbar({
47 {@link #store}: myStore, // grid and PagingToolbar using same store
48 {@link #displayInfo}: true,
49 {@link #pageSize}: myPageSize,
50 {@link #prependButtons}: true,
58 * <p>To use paging, pass the paging requirements to the server when the store is first loaded.</p>
62 // specify params for the first page load if using paging
71 * <p>If using {@link Ext.data.Store#autoLoad store's autoLoad} configuration:</p>
73 var myStore = new Ext.data.Store({
74 {@link Ext.data.Store#autoLoad autoLoad}: {params:{start: 0, limit: 25}},
79 * <p>The packet sent back from the server would have this form:</p>
84 "rows": [ // <b>*Note:</b> this must be an Array
85 { "id": 1, "name": "Bill", "occupation": "Gardener" },
86 { "id": 2, "name": "Ben", "occupation": "Horticulturalist" },
88 { "id": 25, "name": "Sue", "occupation": "Botanist" }
92 * <p><u>Paging with Local Data</u></p>
93 * <p>Paging can also be accomplished with local data using extensions:</p>
94 * <div class="mdetail-params"><ul>
95 * <li><a href="http://extjs.com/forum/showthread.php?t=71532">Ext.ux.data.PagingStore</a></li>
96 * <li>Paging Memory Proxy (examples/ux/PagingMemoryProxy.js)</li>
98 * @constructor Create a new PagingToolbar
99 * @param {Object} config The config object
106 Ext.PagingToolbar = Ext.extend(Ext.Toolbar, {
107 <div id="cfg-Ext.PagingToolbar-store"></div>/**
108 * @cfg {Ext.data.Store} store
109 * The {@link Ext.data.Store} the paging toolbar should use as its data source (required).
111 <div id="cfg-Ext.PagingToolbar-displayInfo"></div>/**
112 * @cfg {Boolean} displayInfo
113 * <tt>true</tt> to display the displayMsg (defaults to <tt>false</tt>)
115 <div id="cfg-Ext.PagingToolbar-pageSize"></div>/**
116 * @cfg {Number} pageSize
117 * The number of records to display per page (defaults to <tt>20</tt>)
120 <div id="cfg-Ext.PagingToolbar-prependButtons"></div>/**
121 * @cfg {Boolean} prependButtons
122 * <tt>true</tt> to insert any configured <tt>items</tt> <i>before</i> the paging buttons.
123 * Defaults to <tt>false</tt>.
125 <div id="cfg-Ext.PagingToolbar-displayMsg"></div>/**
126 * @cfg {String} displayMsg
127 * The paging status message to display (defaults to <tt>'Displaying {0} - {1} of {2}'</tt>).
128 * Note that this string is formatted using the braced numbers <tt>{0}-{2}</tt> as tokens
129 * that are replaced by the values for start, end and total respectively. These tokens should
130 * be preserved when overriding this string if showing those values is desired.
132 displayMsg : 'Displaying {0} - {1} of {2}',
133 <div id="cfg-Ext.PagingToolbar-emptyMsg"></div>/**
134 * @cfg {String} emptyMsg
135 * The message to display when no records are found (defaults to 'No data to display')
137 emptyMsg : 'No data to display',
138 <div id="cfg-Ext.PagingToolbar-beforePageText"></div>/**
139 * @cfg {String} beforePageText
140 * The text displayed before the input item (defaults to <tt>'Page'</tt>).
142 beforePageText : 'Page',
143 <div id="cfg-Ext.PagingToolbar-afterPageText"></div>/**
144 * @cfg {String} afterPageText
145 * Customizable piece of the default paging text (defaults to <tt>'of {0}'</tt>). Note that
146 * this string is formatted using <tt>{0}</tt> as a token that is replaced by the number of
147 * total pages. This token should be preserved when overriding this string if showing the
148 * total page count is desired.
150 afterPageText : 'of {0}',
151 <div id="cfg-Ext.PagingToolbar-firstText"></div>/**
152 * @cfg {String} firstText
153 * The quicktip text displayed for the first page button (defaults to <tt>'First Page'</tt>).
154 * <b>Note</b>: quick tips must be initialized for the quicktip to show.
156 firstText : 'First Page',
157 <div id="cfg-Ext.PagingToolbar-prevText"></div>/**
158 * @cfg {String} prevText
159 * The quicktip text displayed for the previous page button (defaults to <tt>'Previous Page'</tt>).
160 * <b>Note</b>: quick tips must be initialized for the quicktip to show.
162 prevText : 'Previous Page',
163 <div id="cfg-Ext.PagingToolbar-nextText"></div>/**
164 * @cfg {String} nextText
165 * The quicktip text displayed for the next page button (defaults to <tt>'Next Page'</tt>).
166 * <b>Note</b>: quick tips must be initialized for the quicktip to show.
168 nextText : 'Next Page',
169 <div id="cfg-Ext.PagingToolbar-lastText"></div>/**
170 * @cfg {String} lastText
171 * The quicktip text displayed for the last page button (defaults to <tt>'Last Page'</tt>).
172 * <b>Note</b>: quick tips must be initialized for the quicktip to show.
174 lastText : 'Last Page',
175 <div id="cfg-Ext.PagingToolbar-refreshText"></div>/**
176 * @cfg {String} refreshText
177 * The quicktip text displayed for the Refresh button (defaults to <tt>'Refresh'</tt>).
178 * <b>Note</b>: quick tips must be initialized for the quicktip to show.
180 refreshText : 'Refresh',
182 <div id="prop-Ext.PagingToolbar-paramNames"></div>/**
183 * <p><b>Deprecated</b>. <code>paramNames</code> should be set in the <b>data store</b>
184 * (see {@link Ext.data.Store#paramNames}).</p>
185 * <br><p>Object mapping of parameter names used for load calls, initially set to:</p>
186 * <pre>{start: 'start', limit: 'limit'}</pre>
188 * @property paramNames
192 <div id="prop-Ext.PagingToolbar-pageSize"></div>/**
193 * The number of records to display per page. See also <tt>{@link #cursor}</tt>.
198 <div id="prop-Ext.PagingToolbar-cursor"></div>/**
199 * Indicator for the record position. This property might be used to get the active page
200 * number for example:<pre><code>
201 * // t is reference to the paging toolbar instance
202 * var activePage = Math.ceil((t.cursor + t.pageSize) / t.pageSize);
208 initComponent : function(){
209 var pagingItems = [this.first = new T.Button({
210 tooltip: this.firstText,
211 overflowText: this.firstText,
212 iconCls: 'x-tbar-page-first',
214 handler: this.moveFirst,
216 }), this.prev = new T.Button({
217 tooltip: this.prevText,
218 overflowText: this.prevText,
219 iconCls: 'x-tbar-page-prev',
221 handler: this.movePrevious,
223 }), '-', this.beforePageText,
224 this.inputItem = new Ext.form.NumberField({
225 cls: 'x-tbar-page-number',
226 allowDecimals: false,
227 allowNegative: false,
228 enableKeyEvents: true,
233 keydown: this.onPagingKeyDown,
234 blur: this.onPagingBlur
236 }), this.afterTextItem = new T.TextItem({
237 text: String.format(this.afterPageText, 1)
238 }), '-', this.next = new T.Button({
239 tooltip: this.nextText,
240 overflowText: this.nextText,
241 iconCls: 'x-tbar-page-next',
243 handler: this.moveNext,
245 }), this.last = new T.Button({
246 tooltip: this.lastText,
247 overflowText: this.lastText,
248 iconCls: 'x-tbar-page-last',
250 handler: this.moveLast,
252 }), '-', this.refresh = new T.Button({
253 tooltip: this.refreshText,
254 overflowText: this.refreshText,
255 iconCls: 'x-tbar-loading',
256 handler: this.doRefresh,
261 var userItems = this.items || this.buttons || [];
262 if (this.prependButtons) {
263 this.items = userItems.concat(pagingItems);
265 this.items = pagingItems.concat(userItems);
268 if(this.displayInfo){
269 this.items.push('->');
270 this.items.push(this.displayItem = new T.TextItem({}));
272 Ext.PagingToolbar.superclass.initComponent.call(this);
274 <div id="event-Ext.PagingToolbar-change"></div>/**
276 * Fires after the active page has been changed.
277 * @param {Ext.PagingToolbar} this
278 * @param {Object} pageData An object that has these properties:<ul>
279 * <li><code>total</code> : Number <div class="sub-desc">The total number of records in the dataset as
280 * returned by the server</div></li>
281 * <li><code>activePage</code> : Number <div class="sub-desc">The current page number</div></li>
282 * <li><code>pages</code> : Number <div class="sub-desc">The total number of pages (calculated from
283 * the total number of records in the dataset as returned by the server and the current {@link #pageSize})</div></li>
287 <div id="event-Ext.PagingToolbar-beforechange"></div>/**
288 * @event beforechange
289 * Fires just before the active page is changed.
290 * Return false to prevent the active page from being changed.
291 * @param {Ext.PagingToolbar} this
292 * @param {Object} params An object hash of the parameters which the PagingToolbar will send when
293 * loading the required page. This will contain:<ul>
294 * <li><code>start</code> : Number <div class="sub-desc">The starting row number for the next page of records to
295 * be retrieved from the server</div></li>
296 * <li><code>limit</code> : Number <div class="sub-desc">The number of records to be retrieved from the server</div></li>
298 * <p>(note: the names of the <b>start</b> and <b>limit</b> properties are determined
299 * by the store's {@link Ext.data.Store#paramNames paramNames} property.)</p>
300 * <p>Parameters may be added as required in the event handler.</p>
304 this.on('afterlayout', this.onFirstLayout, this, {single: true});
306 this.bindStore(this.store, true);
310 onFirstLayout : function(){
312 this.onLoad.apply(this, this.dsLoaded);
317 updateInfo : function(){
318 if(this.displayItem){
319 var count = this.store.getCount();
320 var msg = count == 0 ?
324 this.cursor+1, this.cursor+count, this.store.getTotalCount()
326 this.displayItem.setText(msg);
331 onLoad : function(store, r, o){
333 this.dsLoaded = [store, r, o];
336 var p = this.getParams();
337 this.cursor = (o.params && o.params[p.start]) ? o.params[p.start] : 0;
338 var d = this.getPageData(), ap = d.activePage, ps = d.pages;
340 this.afterTextItem.setText(String.format(this.afterPageText, d.pages));
341 this.inputItem.setValue(ap);
342 this.first.setDisabled(ap == 1);
343 this.prev.setDisabled(ap == 1);
344 this.next.setDisabled(ap == ps);
345 this.last.setDisabled(ap == ps);
346 this.refresh.enable();
348 this.fireEvent('change', this, d);
352 getPageData : function(){
353 var total = this.store.getTotalCount();
356 activePage : Math.ceil((this.cursor+this.pageSize)/this.pageSize),
357 pages : total < this.pageSize ? 1 : Math.ceil(total/this.pageSize)
361 <div id="method-Ext.PagingToolbar-changePage"></div>/**
362 * Change the active page
363 * @param {Integer} page The page to display
365 changePage : function(page){
366 this.doLoad(((page-1) * this.pageSize).constrain(0, this.store.getTotalCount()));
370 onLoadError : function(){
374 this.refresh.enable();
378 readPage : function(d){
379 var v = this.inputItem.getValue(), pageNum;
380 if (!v || isNaN(pageNum = parseInt(v, 10))) {
381 this.inputItem.setValue(d.activePage);
387 onPagingFocus : function(){
388 this.inputItem.select();
392 onPagingBlur : function(e){
393 this.inputItem.setValue(this.getPageData().activePage);
397 onPagingKeyDown : function(field, e){
398 var k = e.getKey(), d = this.getPageData(), pageNum;
401 pageNum = this.readPage(d);
402 if(pageNum !== false){
403 pageNum = Math.min(Math.max(1, pageNum), d.pages) - 1;
404 this.doLoad(pageNum * this.pageSize);
406 }else if (k == e.HOME || k == e.END){
408 pageNum = k == e.HOME ? 1 : d.pages;
409 field.setValue(pageNum);
410 }else if (k == e.UP || k == e.PAGEUP || k == e.DOWN || k == e.PAGEDOWN){
412 if((pageNum = this.readPage(d))){
413 var increment = e.shiftKey ? 10 : 1;
414 if(k == e.DOWN || k == e.PAGEDOWN){
417 pageNum += increment;
418 if(pageNum >= 1 & pageNum <= d.pages){
419 field.setValue(pageNum);
426 getParams : function(){
427 //retain backwards compat, allow params on the toolbar itself, if they exist.
428 return this.paramNames || this.store.paramNames;
432 beforeLoad : function(){
433 if(this.rendered && this.refresh){
434 this.refresh.disable();
439 doLoad : function(start){
440 var o = {}, pn = this.getParams();
442 o[pn.limit] = this.pageSize;
443 if(this.fireEvent('beforechange', this, o) !== false){
444 this.store.load({params:o});
448 <div id="method-Ext.PagingToolbar-moveFirst"></div>/**
449 * Move to the first page, has the same effect as clicking the 'first' button.
451 moveFirst : function(){
455 <div id="method-Ext.PagingToolbar-movePrevious"></div>/**
456 * Move to the previous page, has the same effect as clicking the 'previous' button.
458 movePrevious : function(){
459 this.doLoad(Math.max(0, this.cursor-this.pageSize));
462 <div id="method-Ext.PagingToolbar-moveNext"></div>/**
463 * Move to the next page, has the same effect as clicking the 'next' button.
465 moveNext : function(){
466 this.doLoad(this.cursor+this.pageSize);
469 <div id="method-Ext.PagingToolbar-moveLast"></div>/**
470 * Move to the last page, has the same effect as clicking the 'last' button.
472 moveLast : function(){
473 var total = this.store.getTotalCount(),
474 extra = total % this.pageSize;
476 this.doLoad(extra ? (total - extra) : total - this.pageSize);
479 <div id="method-Ext.PagingToolbar-doRefresh"></div>/**
480 * Refresh the current page, has the same effect as clicking the 'refresh' button.
482 doRefresh : function(){
483 this.doLoad(this.cursor);
486 <div id="method-Ext.PagingToolbar-bindStore"></div>/**
487 * Binds the paging toolbar to the specified {@link Ext.data.Store}
488 * @param {Store} store The store to bind to this toolbar
489 * @param {Boolean} initial (Optional) true to not remove listeners
491 bindStore : function(store, initial){
493 if(!initial && this.store){
494 if(store !== this.store && this.store.autoDestroy){
495 this.store.destroy();
497 this.store.un('beforeload', this.beforeLoad, this);
498 this.store.un('load', this.onLoad, this);
499 this.store.un('exception', this.onLoadError, this);
506 store = Ext.StoreMgr.lookup(store);
509 beforeload: this.beforeLoad,
511 exception: this.onLoadError
517 this.onLoad(store, null, {});
521 <div id="method-Ext.PagingToolbar-unbind"></div>/**
522 * Unbinds the paging toolbar from the specified {@link Ext.data.Store} <b>(deprecated)</b>
523 * @param {Ext.data.Store} store The data store to unbind
525 unbind : function(store){
526 this.bindStore(null);
529 <div id="method-Ext.PagingToolbar-bind"></div>/**
530 * Binds the paging toolbar to the specified {@link Ext.data.Store} <b>(deprecated)</b>
531 * @param {Ext.data.Store} store The data store to bind
533 bind : function(store){
534 this.bindStore(store);
538 onDestroy : function(){
539 this.bindStore(null);
540 Ext.PagingToolbar.superclass.onDestroy.call(this);
545 Ext.reg('paging', Ext.PagingToolbar);</pre>