Extjs 随笔备忘
浏览数：51 /
时间：2015年06月09日
//Point1.
Ext.define 是用来创建类的。可以用来创建一个自定义的类，在这个自定义类中，可以用extend来继承Ext中的组件类。
举例：
Ext.define('Ext.ux.LiveSearchGridPanel', {
extend: 'Ext.grid.Panel',
requires: [
'Ext.toolbar.TextItem',
'Ext.form.field.Checkbox',
'Ext.form.field.Text',
'Ext.ux.statusbar.StatusBar'
],
/**
* @private
* search value initialization
*/
searchValue: null,
/**
* @private
* The row indexes where matching strings are found. (used by previous and next buttons)
*/
indexes: [],
/**
* @private
* The row index of the first search, it could change if next or previous buttons are used.
*/
currentIndex: null,
/**
* @private
* The generated regular expression used for searching.
*/
searchRegExp: null,
/**
* @private
* Case sensitive mode.
*/
caseSensitive: false,
/**
* @private
* Regular expression mode.
*/
regExpMode: false,
/**
* @cfg {String} matchCls
* The matched string css classe.
*/
matchCls: 'x-livesearch-match',
defaultStatusText: 'Nothing Found',
// Component initialization override: adds the top and bottom toolbars and setup headers renderer.
initComponent: function() {
var me = this;
me.tbar = ['Search',{
xtype: 'textfield',
name: 'searchField',
hideLabel: true,
width: 200,
listeners: {
change: {
fn: me.onTextFieldChange,
scope: this,
buffer: 100
}
}
}, {
xtype: 'button',
text: '<',
tooltip: 'Find Previous Row',
handler: me.onPreviousClick,
scope: me
},{
xtype: 'button',
text: '>',
tooltip: 'Find Next Row',
handler: me.onNextClick,
scope: me
}, '-', {
xtype: 'checkbox',
hideLabel: true,
margin: '0 0 0 4px',
handler: me.regExpToggle,
scope: me
}, 'Regular expression', {
xtype: 'checkbox',
hideLabel: true,
margin: '0 0 0 4px',
handler: me.caseSensitiveToggle,
scope: me
}, 'Case sensitive'];
me.bbar = Ext.create('Ext.ux.StatusBar', {
defaultText: me.defaultStatusText,
name: 'searchStatusBar'
});
me.callParent(arguments);
},
// afterRender override: it adds textfield and statusbar reference and start monitoring keydown events in textfield input
afterRender: function() {
var me = this;
me.callParent(arguments);
me.textField = me.down('textfield[name=searchField]');
me.statusBar = me.down('statusbar[name=searchStatusBar]');
},
// detects html tag
tagsRe: /<[^>]*>/gm,
// DEL ASCII code
tagsProtect: '\x0f',
// detects regexp reserved word
regExpProtect: /\\|\/|\+|\\|\.|\[|\]|\{|\}|\?|\$|\*|\^|\|/gm,
/**
* In normal mode it returns the value with protected regexp characters.
* In regular expression mode it returns the raw value except if the regexp is invalid.
* @return {String} The value to process or null if the textfield value is blank or invalid.
* @private
*/
getSearchValue: function() {
var me = this,
value = me.textField.getValue();
if (value === '') {
return null;
}
if (!me.regExpMode) {
value = value.replace(me.regExpProtect, function(m) {
return '\\' + m;
});
} else {
try {
new RegExp(value);
} catch (error) {
me.statusBar.setStatus({
text: error.message,
iconCls: 'x-status-error'
});
return null;
}
// this is stupid
if (value === '^' || value === '$') {
return null;
}
}
return value;
},
/**
* Finds all strings that matches the searched value in each grid cells.
* @private
*/
onTextFieldChange: function() {
var me = this,
count = 0;
me.view.refresh();
// reset the statusbar
me.statusBar.setStatus({
text: me.defaultStatusText,
iconCls: ''
});
me.searchValue = me.getSearchValue();
me.indexes = [];
me.currentIndex = null;
if (me.searchValue !== null) {
me.searchRegExp = new RegExp(me.searchValue, 'g' + (me.caseSensitive ? '' : 'i'));
me.store.each(function(record, idx) {
var td = Ext.fly(me.view.getNode(idx)).down('td'),
cell, matches, cellHTML;
while(td) {
cell = td.down('.x-grid-cell-inner');
matches = cell.dom.innerHTML.match(me.tagsRe);
cellHTML = cell.dom.innerHTML.replace(me.tagsRe, me.tagsProtect);
// populate indexes array, set currentIndex, and replace wrap matched string in a span
cellHTML = cellHTML.replace(me.searchRegExp, function(m) {
count += 1;
if (Ext.Array.indexOf(me.indexes, idx) === -1) {
me.indexes.push(idx);
}
if (me.currentIndex === null) {
me.currentIndex = idx;
}
return '<span class="' + me.matchCls + '">' + m + '</span>';
});
// restore protected tags
Ext.each(matches, function(match) {
cellHTML = cellHTML.replace(me.tagsProtect, match);
});
// update cell html
cell.dom.innerHTML = cellHTML;
td = td.next();
}
}, me);
// results found
if (me.currentIndex !== null) {
me.getSelectionModel().select(me.currentIndex);
me.statusBar.setStatus({
text: count + ' matche(s) found.',
iconCls: 'x-status-valid'
});
}
}
// no results found
if (me.currentIndex === null) {
me.getSelectionModel().deselectAll();
}
// force textfield focus
me.textField.focus();
},
/**
* Selects the previous row containing a match.
* @private
*/
onPreviousClick: function() {
var me = this,
idx;
if ((idx = Ext.Array.indexOf(me.indexes, me.currentIndex)) !== -1) {
me.currentIndex = me.indexes[idx - 1] || me.indexes[me.indexes.length - 1];
me.getSelectionModel().select(me.currentIndex);
}
},
/**
* Selects the next row containing a match.
* @private
*/
onNextClick: function() {
var me = this,
idx;
if ((idx = Ext.Array.indexOf(me.indexes, me.currentIndex)) !== -1) {
me.currentIndex = me.indexes[idx + 1] || me.indexes[0];
me.getSelectionModel().select(me.currentIndex);
}
},
/**
* Switch to case sensitive mode.
* @private
*/
caseSensitiveToggle: function(checkbox, checked) {
this.caseSensitive = checked;
this.onTextFieldChange();
},
/**
* Switch to regular expression mode
* @private
*/
regExpToggle: function(checkbox, checked) {
this.regExpMode = checked;
this.onTextFieldChange();
}
});//point2.
Ext.create 是将类实例化为对象
举例：
Ext.Loader.setConfig({enabled: true});
Ext.Loader.setPath('Ext.ux', '../ux/');
Ext.require([
'Ext.grid.*',
'Ext.data.*',
'Ext.util.*',
'Ext.tip.QuickTipManager',
'Ext.ux.LiveSearchGridPanel'
]);
Ext.onReady(function() {
Ext.QuickTips.init();
// sample static data for the store
var myData = [
['3m Co', 71.72, 0.02, 0.03, '9/1 12:00am'],
['Alcoa Inc', 29.01, 0.42, 1.47, '9/1 12:00am'],
['Altria Group Inc', 83.81, 0.28, 0.34, '9/1 12:00am'],
['American Express Company', 52.55, 0.01, 0.02, '9/1 12:00am'],
['American International Group, Inc.', 64.13, 0.31, 0.49, '9/1 12:00am'],
['AT&T Inc.', 31.61, -0.48, -1.54, '9/1 12:00am'],
['Boeing Co.', 75.43, 0.53, 0.71, '9/1 12:00am'],
['Caterpillar Inc.', 67.27, 0.92, 1.39, '9/1 12:00am'],
['Citigroup, Inc.', 49.37, 0.02, 0.04, '9/1 12:00am'],
['E.I. du Pont de Nemours and Company', 40.48, 0.51, 1.28, '9/1 12:00am'],
['Exxon Mobil Corp', 68.1, -0.43, -0.64, '9/1 12:00am'],
['General Electric Company', 34.14, -0.08, -0.23, '9/1 12:00am'],
['General Motors Corporation', 30.27, 1.09, 3.74, '9/1 12:00am'],
['Hewlett-Packard Co.', 36.53, -0.03, -0.08, '9/1 12:00am'],
['Honeywell Intl Inc', 38.77, 0.05, 0.13, '9/1 12:00am'],
['Intel Corporation', 19.88, 0.31, 1.58, '9/1 12:00am'],
['International Business Machines', 81.41, 0.44, 0.54, '9/1 12:00am'],
['Johnson & Johnson', 64.72, 0.06, 0.09, '9/1 12:00am'],
['JP Morgan & Chase & Co', 45.73, 0.07, 0.15, '9/1 12:00am'],
['McDonald\'s Corporation', 36.76, 0.86, 2.40, '9/1 12:00am'],
['Merck & Co., Inc.', 40.96, 0.41, 1.01, '9/1 12:00am'],
['Microsoft Corporation', 25.84, 0.14, 0.54, '9/1 12:00am'],
['Pfizer Inc', 27.96, 0.4, 1.45, '9/1 12:00am'],
['The Coca-Cola Company', 45.07, 0.26, 0.58, '9/1 12:00am'],
['The Home Depot, Inc.', 34.64, 0.35, 1.02, '9/1 12:00am'],
['The Procter & Gamble Company', 61.91, 0.01, 0.02, '9/1 12:00am'],
['United Technologies Corporation', 63.26, 0.55, 0.88, '9/1 12:00am'],
['Verizon Communications', 35.57, 0.39, 1.11, '9/1 12:00am'],
['Wal-Mart Stores, Inc.', 45.45, 0.73, 1.63, '9/1 12:00am']
];
/**
* Custom function used for column renderer
* @param {Object} val
*/
function change(val){
if(val > 0){
return '<span style="color:green;">' + val + '</span>';
}else if(val < 0){
return '<span style="color:red;">' + val + '</span>';
}
return val;
}
/**
* Custom function used for column renderer
* @param {Object} val
*/
function pctChange(val){
if(val > 0){
return '<span style="color:green;">' + val + '%</span>';
}else if(val < 0){
return '<span style="color:red;">' + val + '%</span>';
}
return val;
}
// create the data store
var store = Ext.create('Ext.data.ArrayStore', {
fields: [
{name: 'company'},
{name: 'price', type: 'float'},
{name: 'change', type: 'float'},
{name: 'pctChange', type: 'float'},
{name: 'lastChange', type: 'date', dateFormat: 'n/j h:ia'}
],
data: myData
});
// create the Grid, see Ext.
Ext.create('Ext.ux.LiveSearchGridPanel', {
store: store,
columnLines: true,
columns: [
{
text : 'Company',
flex : 1,
sortable : false,
dataIndex: 'company'
},
{
text : 'Price',
width : 75,
sortable : true,
renderer : 'usMoney',
dataIndex: 'price'
},
{
text : 'Change',
width : 75,
sortable : true,
dataIndex: 'change',
renderer: change
},
{
text : '% Change',
width : 75,
sortable : true,
dataIndex: 'pctChange',
renderer: pctChange
},
{
text : 'Last Updated',
width : 85,
sortable : true,
dataIndex: 'lastChange'
}
],
height: 350,
width: 600,
title: 'Live Search Grid',
renderTo: 'grid-example',
viewConfig: {
stripeRows: true
}
});
});
关于prototype，把它当作一个对象，而非类。
JS的处理机制：在处理“.”或者是"[key]"引用的对象的属性或者方法时，现在本身的实例对象this中寻找，找到即返回；若没找到，再从prototype实例对象中去查找。
Ext.namespace("gb");
Wg = gb;
Wg.grid = function (config){}
Ext.apply(Wg.grid.prototype, {
init:function(param1,param2,...){
var me = this;
}
});
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