AngularJS指令中没有值的属性 [英] Attribute without value in AngularJS directive

问题描述

我写了一个带有隔离范围的指令.

I've written a directive with an isolate scope.

app.directive('myDirective', function() {
    return {
        restrict: 'E',
        scope {
            attr1: '@',
            attr2: '@',
            noValueAttr: // what to put here?
        },
        link: function(scope, elem, attrs) {
            // how to check here if noValueAttr is present in mark-up?
        }
    };
});

html可能是

<my-directive attr1='...' attr='...' ... no-value-attr>

或

<my-directive attr1='...' attr='...' >

我想知道如何使用(并让指令检测是否存在)没有指定值的可选属性.谢谢.

I am wondering how to use (and have the directive detect if it's there or not) an optional attribute which has no assigned value. Thanks.

推荐答案

只需在链接函数中使用attrs.hasOwnProperty('noValueAttr')来测试该属性是否存在.

Just use attrs.hasOwnProperty('noValueAttr') in the link function to test whether the attribute is present or not.

别忘了标记中的属性将是no-value-attr，而不是您显示的noValueAttr.

Don't forget the attribute in markup would be no-value-attr, not noValueAttr like you showed.

 link: function(scope, elem, attrs) {
           if (attrs.hasOwnProperty('noValueAttr'))
              // attribute is present
           else 
              // attribute is not present

    }

这篇关于AngularJS指令中没有值的属性的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！