angular.js - 求一个angularJS写法
问题描述
A是下拉列表 BC是文本框。默认C文本框是隐藏。B文本框可用 。要实现当A下拉选择最后一个元素，B禁用同时C显示。A不选择最后一个元素，恢复原样。
<fieldset> <legend>Household Income Survey</legend> <p class='row'><p class='form-group col-xs-12 col-sm-6'> <label for='HouseholdSize' class='control-label'>I. How many people live in your home?</label> <select name='HouseholdSize' id='HouseholdSize'><option value='1'>1</option><option value='2'>2</option><option value='3'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='8+'>8+</option> </select></p><p class='form-group col-xs-12 col-sm-6'> <label for='HouseholdIncome' class='control-label'>II. Household Annual Income</label> <select name='HouseholdIncome' id='HouseholdIncome'><option value=''></option><option value='15171'>15171</option><option value='21590'>21590</option><option value='29101'>29101</option><option value='36612'>36612</option><option value='44123'>44123</option><option value='51634'>51634</option><option value='59145'>59145</option><option value='66656'>66656</option><option value='74167'>74167</option> </select></p> </p> <p id='HouseholdIncomeGroup'><label for='HouseholdIncome'>III. If there are more than 8 people living at your home, please write the annual household income here</label><p class='input-group'> <p class='input-group-addon'>$</p> <input type='text' name='' placeholder=''></p> </p></fieldset>
问题解答
回答1：html代码：
<fieldset ng-controller='IncomeCtrl'> <legend>Household Income Survey</legend> <p class='row'><p class='form-group col-xs-12 col-sm-6'> <label class='control-label'>I. How many people live in your home? </label> <select ng-model='householdSize' ng-change='change()'><option value='1'>1</option><option value='2'>2</option><option value='3'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='8+'>8+</option> </select></p><p class='form-group col-xs-12 col-sm-6'> <label class='control-label'>II. Household Annual Income </label> <select ng-model='householdIncome' ng-disabled='showDefIncom'><option value=''></option><option value='15171'>15171</option><option value='21590'>21590</option><option value='29101'>29101</option><option value='36612'>36612</option><option value='44123'>44123</option><option value='51634'>51634</option><option value='59145'>59145</option><option value='66656'>66656</option><option value='74167'>74167</option> </select></p> </p> <p ng-show='showDefIncom'><label class='control-label'> III. If there are more than 8 people living at your home, please write the annual household income here</label><p class='input-group'> <p class='input-group-addon'>$</p> <input type='text' ng-model='defHouseholdIncome'></p> </p></fieldset>
JavaScript代码：
.controller(’IncomeCtrl’, function ($scope) { $scope.householdSize = 1; $scope.householdIncome = 15171; $scope.defHouseholdIncome = 0; $scope.showDefIncom = false; $scope.change = function () {$scope.showDefIncom = $scope.householdSize === ’8+’ ? true : false; };})回答2：
和 @nightire 的思路一样的，这里贴出代码部分：
html<body ng-app='app'> <p ng-controller='main'><select ng-options='item for item in items' ng-model='selVal' ng-init='selVal = items[0]'></select><input type='text' ng-model='b' ng-disabled='selVal===items[items.length-1]' placeholder='b'><input type='text' ng-model='c' ng-show='selVal===items[items.length-1]' placeholder='c'> </p> <script type='text/javascript'> var app = angular.module(’app’, []); app.controller(’main’, [’$scope’, function($scope) {$scope.items = [’1’, ’2’, ’3’, ’4’, ’5’]; }]); </script></body>
大概这样的。
回答3：<select> 填充好，然后 ng-model 绑定作用域里一个属性，然后 $watch 这个属性，当条件满足时改变一个状态属性（预先定义好），最后将这个状态属性双向绑定给 B 的 ng-disabled 和 C 的 ng-show/ng-if 就行了吧。
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