在前几篇随笔简单介绍了AngularJS，在AngularJS 指令（directive）是重要的概念，主要负责了很大部分的组建样式交互。在前面介绍过directive需要预先的模板编译在返回一个link的函数，注册行为事件交互等等。在这里不多说了，关于指令的介绍将在后续一并补上。在这里我们先看一个利用jQuery UI组件开发的AngularJS Autocomplete指令。
代码：jsfiddle在线测试
Directive:
2 jQuery.ui.autocomplete.prototype._suggest = function(items) {
3 var itemsArray = items;
4 if ( this.options.maxItems && this.options.maxItems > 0) {
5 itemsArray = items.slice(0, this.options.maxItems);
6 }
7 oldSuggest.call( this, itemsArray);
8 };
9
10 var autocomplete = function() {
11 var linkFun = function($scope, element, attrs) {
12 var $input = jQuery(element);
13 var responseDataSource = function($scope, source, pattern, response) {
14 var express = $scope[source];
15 var data = typeof(express) === "function" ? express(pattern, response) : express;
16 if (data) {
17 response(data);
18 }
19 };
20 var option = attrs;
21 //
22 option.position = {
23 my: attrs.positionMy,
24 at: attrs.positionAt,
25 };
26 var option = jQuery.extend({
27 position: {
28 my: "",
29 at: ""
30 },
31 close: function(event, ui) {
32 var express = attrs["ngModel"] + "='" + $input.val() + "'";
33 $scope.$apply(express);
34 $scope.$eval(attrs["ngChange"]);
35 }
36 }, option);
37 option.remote = option.remote === "true";
38 if (!option.remote) {
39 option.dataSource = attrs.source;
40 option.source = function(pattern, response) {
41 var option = $input.autocomplete("option");
42 var responseEx = function(data) {
43 var matches = jQuery.map(data, function(tag) {
44 var startWith = attrs.startWith === "true";
45 var index = tag.toUpperCase().indexOf(pattern.term.toUpperCase())
46 if ((startWith && index === 0) || (!startWith && index > -1)) {
47 return tag;
48 }
49 })
50 response(matches);
51 };
52 responseDataSource($scope, option.dataSource, pattern, responseEx);
53 };
54 } else {
55 option.source = option.source; // remote url
56 }
57 $input.autocomplete(option);
58 };
59 return linkFun;
60 };
61
62 var prefixed = "green";
63 var appMoule = angular.module('app', []);
64
65 appMoule.directive(prefixed + "Autocomplete", autocomplete);
在指令中主需要标注html attribute green-autocomplete=””引用.
以及一些特殊option：
- Remote：(Boolean)是否为远程调用，true则source为url，false则为scope上的一个属性或者函数。
- Source：数据源，url、scope属性或者函数。
- min-length：开始显示下拉条的最小长度。
- position-my，position-at：jQuery下拉条显示样式
- start-with：（Boolean)是否为以前缀开始的帅选，默认false（包含）。
- max-items：显示最大下拉项数目。
测试代码：
html： 1 <div ng-app="app" ng-controller="Test">
2
<
div
class
="ui-widget"
>
3 < label for ="tags" >Tags(变量): </ label >
4 < input id ="tags" ng-model ="val" green-autocomplete ="" remote ="false" ng-disabled ="val=='Asp'" source ="getsource" min-length ="0" position-my ="right top" position-at = "right bottom" start-with ="false" >
5 </ div >
6 < br />
7 {{val}}
8
9 < div class ="ui-widget" >
10 < label for ="tags" >Tags(函数): </ label >
11 < input i ng-model ="val_Array" green-autocomplete ="" source ="availableTags" max-items ="5" min-length ="2" start-with ="true" ng-change ="change();" >
12 </ div >
13 < br />{{val_Array}}
14 http://XX/XX.php?term={0}
15 < div class ="ui-widget" >
16 < label for ="tags" >Tags(url): </ label >
17 < input i ng-model ="val_url" green-autocomplete ="" source ="url" remote ="true" max-items ="3" >
18 </ div >
19 < br />
20 {{val_url}}
21 </ div >
3 < label for ="tags" >Tags(变量): </ label >
4 < input id ="tags" ng-model ="val" green-autocomplete ="" remote ="false" ng-disabled ="val=='Asp'" source ="getsource" min-length ="0" position-my ="right top" position-at = "right bottom" start-with ="false" >
5 </ div >
6 < br />
7 {{val}}
8
9 < div class ="ui-widget" >
10 < label for ="tags" >Tags(函数): </ label >
11 < input i ng-model ="val_Array" green-autocomplete ="" source ="availableTags" max-items ="5" min-length ="2" start-with ="true" ng-change ="change();" >
12 </ div >
13 < br />{{val_Array}}
14 http://XX/XX.php?term={0}
15 < div class ="ui-widget" >
16 < label for ="tags" >Tags(url): </ label >
17 < input i ng-model ="val_url" green-autocomplete ="" source ="url" remote ="true" max-items ="3" >
18 </ div >
19 < br />
20 {{val_url}}
21 </ div >
javascript：
2 var test = function($scope) {
3 $scope.availableTags = [
4 "ActionScript",
5 "AppleScript",
6 "Asp",
7 "BASIC",
8 "C",
9 "C++",
10 "Clojure",
11 "COBOL",
12 "ColdFusion",
13 "Erlang",
14 "Fortran",
15 "Groovy",
16 "Haskell",
17 "Java",
18 "JavaScript",
19 "Lisp",
20 "Perl",
21 "PHP",
22 "Python",
23 "Ruby",
24 "Scala",
25 "Scheme"
26 ];
27
28 $scope.getsource = function(pattern, response) {
29 response($scope.availableTags);
30 };
31 $scope.change = function() {
32 console.log('change', $scope.val_Array);
33 };
34 };
35
36 appMoule.controller("Test", test);
37 // mock ajax.
38 var oldAjax = jQuery.ajax;
39 jQuery.ajax = function(param) {
40 if (param.url === "url") {
41 var term = param.data.term;
42 param.success([term + "1", term + "2", 3 + term, 4 + term]);
43 }
44 else {
45 oldAjax(param);
46 }
47 };
48
49 //jQuery.ajax({url:"text.html"}); must erroe:GET http://fiddle.jshell.net/_display/text.html 404 (NOT FOUND)
在测试中为了验证url，本想通过自己的博客导入json数据，但是跨域等问题，所以没办法，在最后选择了mock jQuery.Ajax，本想引入jasmine测试框架利用spyOn(jasmine测试mock文档：
http://pivotal.github.com/jasmine/jsdoc/symbols/jasmine.Spy.html)，但是找了很久没找到在线引用包。最后采用手动血mock代码如下：
1 // mock ajax.
2 var oldAjax = jQuery.ajax;
3 jQuery.ajax = function(param) {
4 if (param.url === "url") {
5 var term = param.data.term;
6 param.success([term + "1", term + "2", 3 + term, 4 + term]);
7 }
8 else {
9 oldAjax(param);
10 }
11 };
所以你看见的第三个返回值永远会是输入前缀加1,2,3.
测试第一输入框测试scope属性，第二测试scope函数（有两个输入参数），第三测试url ajax。
作者：破 狼
出处：http://www.cnblogs.com/whitewolf/
本文版权归作者，欢迎转载，但未经作者同意必须保留此段声明，且在文章页面明显位置给出原文连接，否则保留追究法律责任的权利。该文章也同时发布在我的独立博客中-个人独立博客、博客园--破狼和51CTO--破狼。http://www.cnblogs.com/whitewolf/archive/2012/09/02/2667365.html
