AngularJS ng-readonly用法及代码示例

AngularJS中的ng-readonly指令用于指定HTML元素的只读属性。仅当ng-readonly指令中的表达式返回true时，HTML元素才是只读的。

用法:

<element ng-readonly="expression"> Contents... </element>

范例1：本示例使用ng-readonly指令启用只读属性。

<!DOCTYPE html> 
<html> 
    <head> 
        <title>ng-readonly Directive</title> 
          
        <script src= 
"https://ajax.googleapis.com/ajax/libs/angularjs/1.4.2/angular.min.js"> 
        </script> 
    </head> 
      
    <body ng-app style="text-align:center"> 
        <h1 style="color:green">GeeksforGeeks</h1> 
        <h2>ng-readonly Directive</h2> 
          
        <div> 
            <label>Check to make month readonly:<input type="checkbox"
            ng-model="open"></label> 
              
            <br><br> 
              
            Input Month:<input ng-readonly="open" type="month"
                    ng-model="month"> 
        </div> 
    </body> 
</html>

输出：
在选中复选框之前：
ngreadonly
选中复选框后：

范例2：本示例使用ng-readonly指令启用选项列表中的readonly属性。

<!DOCTYPE html> 
<html> 
    <head> 
        <title>ng-readonly Directive</title> 
          
        <script src= 
"https://ajax.googleapis.com/ajax/libs/angularjs/1.4.2/angular.min.js"> 
        </script> 
    </head> 
      
    <body ng-app="app" style="text-align:center"> 
        <h1 style="color:green">GeeksforGeeks</h1> 
        <h2>ng-readonly Directive</h2> 
        <div ng-controller="geek"> 
            <div > 
                <button ng-click="edit=true">Edit</button> 
                <button ng-init="edit=false" ng-click="edit=false"> 
                    Update 
                </button>                  
            </div> 
            <br> 
              
            <div>Select sorting algorithm</div><br> 
              
            <div><select class="form-control" ng-disabled="!edit"
                    ng-init="status=1" ng-model="status"
                    ng-options="s.id as s.set for s in set"> 
                </select> 
            </div> 
        </div> 
          
        <script> 
            var app = angular.module("app", []); 
            app.controller('geek', ['$scope', function ($scope) { 
                $scope.set = [{ id:1, set:'Merge sort' }, 
                    { id:2, set:'Quick sort' }, 
                    { id:3, set:'Bubble sort' }]; 
            }]); 
        </script> 
    </body> 
</html>

输出：
单击编辑按钮：
ngreadonly
单击更新按钮：

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注：本文由纯净天空筛选整理自Vishal Chaudhary 2大神的英文原创作品 AngularJS | ng-readonly Directive。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。