ExtJS learning -------- query method learning in Ext. Element (Instance)

ExtJS learning -------- query method learning in Ext. Element (Instance)

Example: (you can copy the code to demonstrate the experiment results) <喎?http: www.bkjia.com kf ware vc " target="_blank" class="keylink"> VcD4KPHA + PHByZSBjbGFzcz0 = "brush: java;"> Ext. onReady (function () {Ext. create ('ext. panel. panel ', {// create a Panel title: 'My panel', width: '000000', height: 100%, renderTo: Ext. getBody (), html: 'I am sp content I am d2 content'}); // query is the most common method: // Ext. dom. element get fly getDomvar d1 = Ext. get ('d1 '); var sp = Ext. get ('SP '); // query system method: // 1: contains: determines whether the element contains another element alert (d1.contains (sp )); alert (d1.contains ('SP '); // 2: child: select the element that matches the selector from the direct sub-element of the element (only one element is returned, the second parameter of the two parameters is optional. If it is set to true, the native HTMLElement var metadata = d1.child ('span ') is obtained. // Ext. dom. elementalert (ch. dom. innerHTML); var ch2 = d1.child ('span ', true); // HTMLElementalert (ch. innerHTML); // 3: down: select the child element of the element that matches the selector. // findParentNode and up: find the parent element var ready = d1.down ('# d2') and alert (ch1.dom. innerHTML); // 4: first: select the first child element of the element // last: select the last child element of the element var f1 = d1.first ('div '); alert (f1.dom. innerHTML); // 5: findParent: Find the parent element of the element that matches the simple selector. // parent: return the parent element var parent = sp. findParent ('div '); alert (parent. innerHTML); // 6: is: determines whether the element matches the selection character alert (d1.is ('div '); // 7: next: select the next element of the same layer // prew: select the previous element var next = sp. next (); alert (next. dom. nodeName); // 8: Ext. query: gets the element (Ext. dom. element. query) var arr = Ext. query ('span ', 'd1'); // HTMLElement [] Ext. array. each (arr, function (item) {alert (item. innerHTML) ;}); // 9: Ext. select/Ext. dom. element. select: gets the element set based on the selection operator // returns all element sets: Ext. dom. compositeElementLite (HTMLElemennt)/Ext. dom. compositeElement (Ext. dom. element) // parameter description: three parameters, // 1: selector (do not use id selector) // 2: returned collection object (boolean false: Ext. dom. compositeElementLite true: Ext. dom. compositeElement) // 3: Specify the root node to start searching // var list1 = Ext when the parameter is false. select ('span ', false, 'd1'); // Ext. dom. compositeElementLiteExt. array. each (list1.elements, function (el) {alert (el. innerHTML) ;}); // var list2 = Ext. select ('span ', true, 'd1'); // Ext. dom. compositeElementExt. array. each (list2.elements, function (el) {alert (el. dom. innerHTML );});});