Angular HTML Select 选项禁用和启用
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Angular HTML Select option disable and enable
提问by Satish Sharma
I have a html select option
我有一个 html 选择选项
<select>
<option ng-repeat="field in filter.fields" value="{{field.id}}">{{field.name}}</option>
</select>
which I am iterating from ng-repeat , I want to disable option on basis of a filed selectable like
我正在从 ng-repeat 迭代，我想根据一个可选的文件来禁用选项，比如
<select>
<option ng-repeat="field in filter.fields" {field.selectable==true?enable:disable} value="{{field.id}}">{{field.name}}</option>
</select>
How can I achieve this with angular?
我怎样才能用角度来实现这一点？
回答by Kasper Lewau
Assuming you have a structure like this:
假设你有这样的结构：
$scope.filter = {
fields: [
{id: 1, name: "a", selectable: false},
{id: 2, name: "asdf", selectable: true},
{id: 3, name: "qwet", selectable: false},
{id: 4, name: "qnjew", selectable: true},
{id: 5, name: "asdjf", selectable: false}
]
};
This should work for you:
这应该适合你：
<select>
<option ng-repeat="field in filter.fields" ng-disabled="field.selectable" value="{{field.id}}">{{field.name}}</option>
</select>
回答by m59
While the ng-disabled attribute will technically work, you are likely to encounter bugs when using ng-repeat on options. This is a well known issue and is exactly the reason that the angular team created ng-options. There is not yet an angular implementation for using ng-options and ng-disabled together, but Alec LaLondecreated this custom directive that you can add in and use. See the issue forum here: https://github.com/angular/angular.js/issues/638and the jsfiddle from that post.
虽然 ng-disabled 属性在技术上有效，但在选项上使用 ng-repeat 时可能会遇到错误。这是一个众所周知的问题，这正是 angular 团队创建 ng-options 的原因。目前还没有同时使用 ng-options 和 ng-disabled 的 angular 实现，但是Alec LaLonde创建了这个自定义指令，您可以添加和使用它。请参阅此处的问题论坛：https://github.com/angular/angular.js/issues/638和该帖子中的jsfiddle。
angular.module('myApp', [])
.directive('optionsDisabled', [ '$parse', function($parse) {
var disableOptions = function($scope, attr, $element, data, fnDisableIfTrue) {
$element.find('option:not([value="?"])').each(function(i, e) { //1
var locals = {};
locals[attr] = data[i];
$(this).attr('disabled', fnDisableIfTrue($scope, locals));
});
};
return {
priority: 0,
require: 'ngModel',
link: function($scope, $element, attributes) { //2
var expElements = attributes.optionsDisabled.match(/^\s*(.+)\s+for\s+(.+)\s+in\s+(.+)?\s*/),
attrToWatch = expElements[3],
fnDisableIfTrue = $parse(expElements[1]);
$scope.$watch(attrToWatch, function(newValue, oldValue) {
if (!newValue) return;
disableOptions($scope, expElements[2], $element, newValue, fnDisableIfTrue);
}, true);
$scope.$watch(attributes.ngModel, function(newValue, oldValue) { //3
var disabledOptions = $parse(attrToWatch)($scope);
if (!newValue) return;
disableOptions($scope, expElements[2], $element, disabledOptions, fnDisableIfTrue);
});
}
};
}
]);
//1 refresh the disabled options in the select element
//2 parse expression and build array of disabled options
//3 handle model updates properly
function OptionsController($scope) {
$scope.ports = [{name: 'http', isinuse: true},
{name: 'test', isinuse: false}];
$scope.selectedport = 'test';
}
回答by user1545858
This is actually a fairly old question. In the later version of Angular (angular 1.4+) you have the ngOptions directive. Here is the link:-
这实际上是一个相当古老的问题。在更高版本的 Angular（angular 1.4+）中，你有 ngOptions 指令。链接在这里：-
https://docs.angularjs.org/api/ng/directive/ngOptions
https://docs.angularjs.org/api/ng/directive/ngOptions
There is now a syntax for handling this case:-
现在有一种处理这种情况的语法：-
label disable when disable for value in array track by trackexpr
I thought I would put this in in case someone else visits this page.
我想我会把这个放在以防其他人访问这个页面。
