angularjs – 在ng-repeat中动态添加指令

我正在努力在ng-repeat中动态添加不同的指令,但是输出不会被解释为指令。

我在这里添加了一个简单的例子:http://plnkr.co/edit/6pREpoqvmcnJJWzhZZKq

控制器:

$scope.colors = [{name:"red"}, {name: "blue"}, {name:"yellow"}]; 

指示:

app.directive("red", function () {
    return {
        restrict: 'C',
        template: "RED directive"
    }
});

HTML:

<ul>
  <li ng-repeat="color in colors">
    <span class="{{color.name}}"></span>
  </li>
</ul>

如何使角度拾取通过ng-repeat输出的类中指定的指令?

我知道这是一个古老的问题,但是谷歌把我带到了这里,我不喜欢这里的答案。他们似乎对于应该简单的东西来说真的很复杂。所以我创建了这个指令:

*****新内容*****

我已经使这个指令更通用,支持解析(典型的角度值)“属性”属性。

/**
 * Author: Eric Ferreira <https://stackoverflow.com/users/2954747/eric-ferreira> ©2016
 *
 * This directive takes an attribute object or string and adds it to the element
 *   before compilation is done. It doesn't remove any attributes, so all
 *   pre-added attributes will remain.
 *
 * @param {Object<String, String>?} attributes - object of attributes and values
 */
.directive('attributes', function attributesDirective($compile, $parse) {
    'use strict';

    return {
        priority: 999,
        terminal: true,
        restrict: 'A',
        compile: function attributesCompile() {
            return function attributesLink($scope, element, attributes) {
                function parseAttr(key, value) {
                    function convertToDashes(match) {
                        return match[0] + '-' + match[1].toLowerCase();
                    }

                    attributes.$set(key.replace(/([a-z][A-Z])/g, convertToDashes), value !== undefined && value !== null ? value : '');
                }

                var passedAttributes = $parse(attributes.attributes)($scope);

                if (passedAttributes !== null && passedAttributes !== undefined) {
                    if (typeof passedAttributes === 'object') {
                        for (var subkey in passedAttributes) {
                            parseAttr(subkey, passedAttributes[subkey]);
                        }
                    } else if (typeof passedAttributes === 'string') {
                        parseAttr(passedAttributes, null);
                    }
                }

                $compile(element, null, 999)($scope);
            };
        }
    };
});

对于OP的用例,您可以:

<li ng-repeat="color in colors">
    <span attributes="{'class': color.name}"></span>
</li>

或者将其用作属性指令:

<li ng-repeat="color in colors">
    <span attributes="color.name"></span>
</li>

***** END NEW CONTENT ******

/**
 * Author: Eric Ferreira <https://stackoverflow.com/users/2954747/eric-ferreira> ©2015
 *
 * This directive will simply take a string directive name and do a simple compilation.
 * For anything more complex, more work is needed.
 */
angular.module('attributes', [])

.directive('directive', function($compile, $interpolate) {
    return {
        template: '',
        link: function($scope, element, attributes) {
            element.append($compile('<div ' + attributes.directive + '></div>')($scope));
        }
    };
})

;

对于这个问题的具体情况,可以重写一下这个指令,以使它按照类的顺序应用指令,如下所示:

angular.module('attributes', [])

.directive('directive', function($compile, $interpolate) {
    return {
        template: '',
        link: function($scope, element, attributes) {
            element.replaceWith($compile('<span class=\"' + attributes.directive + '\"></span>')($scope));
        }
    };
})

;

然后,您可以在任何地方使用,并通过动态名称选择一个指令。使用它像这样:

<li ng-repeat="color in colors">
    <span directive="{{color.name}}"></span>
</li>

我有意地保持这个指令简单直接。你可能(并且可能会)必须重写它,以适应你的需要。

翻译自:https://stackoverflow.com/questions/16264534/dynamically-adding-directives-in-ng-repeat

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