Angularjs 禁用下拉菜单 [英] Angularjs disabling drop down

问题描述

我有一个用户界面，根据一个下拉菜单的选择，另一个下拉菜单应该被禁用.这两个下拉菜单都是使用 ng-repeat 生成的.下面是代码示例

<tr data-ng-repeat="xyz.divisionViewList 中的abc" ><选择data-ng-model="abc.selectedAppRole"ng-init="abc.selectedAppRole =abc.selectedAdRole"id="{{abc.applicationId}}_{{abc.divisionId}}" name="{{abc.selectedAppRole}}"><option value="null">选择/取消选择角色</option><option data-ng-repeat="abc.roleDetails 中的roleDetail" data-ng-selected="{{abc.adRole == abc.selectedAdRole}}"value="{{abc.adRole}}">&nbsp;{{abc.roleDesc}}&nbsp;</option></选择></tr>

由于这是一个基于 ng-repeat 的动态生成的下拉列表，我想根据一个下拉列表的选择进行验证.请让我知道如何进行此验证，以便我可以根据其他人的选择禁用和启用任何下拉列表.我真的坚持这个.

解决方案

使用 ng-disabled 并使用下拉列表之一的模型值禁用/启用另一个.

示例应用:

angular.module('app', []).controller('MyController', function($scope){$scope.dropdownSelections = {};$scope.dropdownA = [{值:1，标签:'项目A1'}，{值:2，标签:'项目A2'}，{值:3，标签:'项目A3'}，{值:4，标签:'项目A4'}];$scope.dropdownB = [{值:1，标签:'项目B1'}，{值:2，标签:'项目B2'}，{值:3，标签:'项目B3'}，{值:4，标签:'项目B4'}];$scope.dropdownC = [{值:1，标签:'项目C1'}，{值:2，标签:'项目C2'}，{值:3，标签:'项目C3'}，{值:4，标签:'项目C4'}];});

示例模板代码:

<div>下拉选择:{{dropdownSelections}}</div><div><legend>下拉菜单A</legend><select name="A" id="A" ng-model="dropdownSelections.dropdowA" ng-options="item.value as item.label for item in dropdownA"></select>
<div><legend>下拉菜单B</legend><select name="B" id="B" ng-model="dropdownSelections.dropdowB" ng-options="item.value as item.label for item in dropdownB" ng-disabled="dropdownSelections.dropdowA !==2"></选择>

<div><legend>下拉菜单C</legend><select name="C" id="C" ng-model="dropdownSelections.dropdowC" ng-options="item.value as item.label for item in dropdownC" ng-disabled="dropdownSelections.dropdowB !==3"></选择>

当 DropdownA 选择了选项 2 时，将启用 DropdownB.当 DropdownB 选择了选项 3 时，将启用 DropdownC.当然这只是基本的例子，代码并不完善，只是演示了思路.

我在 这个 JSFiddle 中创建了工作示例.

可以在此文档中找到有关 ng-disabled 的更多信息.

I have a ui in which based on the selection of one drop down another dropdown should be disabled. Both these dropdowns are generated using ng-repeat . Below is the code sample

<tr data-ng-repeat="abc in xyz.divisionViewList" >
<select
                 data-ng-model="abc.selectedAppRole"
                 ng-init="abc.selectedAppRole =abc.selectedAdRole"
                 id="{{abc.applicationId}}_{{abc.divisionId}}" name="{{abc.selectedAppRole}}">
                 <option value="null">Select/Deselect a role</option>
                <option data-ng-repeat="roleDetail in abc.roleDetails" data-ng-selected="{{abc.adRole == abc.selectedAdRole}}"
                 value="{{abc.adRole}}">&nbsp;{{abc.roleDesc}}&nbsp;</option>
                </select>
</tr>

As this is a dynamic generated drop downs based on ng- repeat, i want to put validations based on selection on one drop down. Please let me know how can i put this validation so that i can disable and enable any dropdown based on selection of the other. I am really stuck on this.

解决方案

Use ng-disabled and use model value of one of the dropdowns to disable/enable the other.

Example app:

angular.module('app', []).controller('MyController', function($scope){
  $scope.dropdownSelections = {};

  $scope.dropdownA = [
    {value: 1, label: 'Item A1'},
    {value: 2, label: 'Item A2'},
    {value: 3, label: 'Item A3'},
    {value: 4, label: 'Item A4'}
  ];

  $scope.dropdownB = [
    {value: 1, label: 'Item B1'},
    {value: 2, label: 'Item B2'},
    {value: 3, label: 'Item B3'},
    {value: 4, label: 'Item B4'}
  ];

  $scope.dropdownC = [
    {value: 1, label: 'Item C1'},
    {value: 2, label: 'Item C2'},
    {value: 3, label: 'Item C3'},
    {value: 4, label: 'Item C4'}
  ];
});

Example template code:

<div ng-controller="MyController">
  <div>Dropdown selections: {{dropdownSelections}}</div>
  <div>
    <legend>Dropdown A</legend>
    <select name="A" id="A" ng-model="dropdownSelections.dropdowA" ng-options="item.value as item.label for item in dropdownA"></select>
  </div>
  <div>
    <legend>Dropdown B</legend>
    <select name="B" id="B" ng-model="dropdownSelections.dropdowB" ng-options="item.value as item.label for item in dropdownB" ng-disabled="dropdownSelections.dropdowA !== 2"></select>
  </div>
  <div>
    <legend>Dropdown C</legend>
    <select name="C" id="C" ng-model="dropdownSelections.dropdowC" ng-options="item.value as item.label for item in dropdownC" ng-disabled="dropdownSelections.dropdowB !== 3"></select>
  </div>
</div>

DropdownB will be enabled when DropdownA has option 2 selected. DropdownC will be enabled when DropdownB has option 3 selected. Of course this is only basic example, the code is not perfect, but demonstrates the idea.

I've created working example in this JSFiddle.

More information about ng-disabled can be found in this doc.

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