量角器:我如何在Protractor中正确使用过滤？

Question

我尝试用量角器开始测试,现在我遇到了一个问题,我无法解决.

我有这个测试:

 describe('Test_3', function() {
    var my_url = 'http://wks-15103:8010/ps/ng-components/examples/ps-checkbox.html'
    var main_checkbox = element(by.xpath("//div[@ng-model='My_Group']/div[1]/span/span[1]"));
    var checkbox_list = element.all(by.xpath("//div[@ng-model='My_Group']/div[2]/div/span/span[1]")); 
    var title_checkbox_list = element.all(by.xpath("//div[@ng-model='My_Group']/div[2]/div/span"));   
    var disabled_pri = 'n-check-checkbox';
    var enabled_pri = 'n-check-checkbox n-check-checkbox_checked';


    beforeEach(function() {
        browser.get(my_url);
    });

    it('schould be chosen',function(){
        main_checkbox.click(); 

        checkbox_list.filter(function(elem, index) {
            return elem.getAttribute('class').then(function(text) {
                return text != 'n-check-checkbox n-check-checkbox_disabled' & text!='n-check-checkbox n-check-checkbox_disabled n-check-checkbox_checked';
            });
        }).then(function(filteredElements) {
            filteredElements.each(function(element, index) {
                expect(element.getAttribute('class')).toEqual(disabled_pri); 
            });
        });
    });
}); 

它不起作用.但后来我尝试使用过滤而没有循环.each它工作正常.

 describe('Test_3', function() {
    var my_url = 'http://wks-15103:8010/ps/ng-components/examples/ps-checkbox.html'
    var main_checkbox = element(by.xpath("//div[@ng-model='My_Group']/div[1]/span/span[1]"));
    var checkbox_list = element.all(by.xpath("//div[@ng-model='My_Group']/div[2]/div/span/span[1]"));  //??? ?????? ????? ?????????
    var title_checkbox_list = element.all(by.xpath("//div[@ng-model='My_Group']/div[2]/div/span"));  //??? ?????? ????????? ? ??????????  
    var disabled_pri = 'n-check-checkbox';
    var enabled_pri = 'n-check-checkbox n-check-checkbox_checked';

    beforeEach(function() {
        browser.get(my_url);
    });

    it('schould be chosen',function(){
        main_checkbox.click();     //?????? ?????? ? ?????????? ????????   

        checkbox_list.filter(function(elem, index) {
        return elem.getAttribute('class').then(function(text) {
            return text != 'n-check-checkbox n-check-checkbox_disabled' & text!='n-check-checkbox n-check-checkbox_disabled n-check-checkbox_checked';
        });
        }).then(function(filteredElements) {
            filteredElements[0].click();
            filteredElements[0].click();
            expect(filteredElements[0].getAttribute('class')).toEqual(disabled_pri);
        }); 
    }); 
}); 

我的错是什么？

Answer 1

如文档filter中所述,它返回一个实例ElementArrayFinder.当你then在实例上调用一个方法时ElementArrayFinder,它会解析为一个ElementFinders 数组,所以在回调中then你会得到一个纯JavaScript的数组ElementFinder.要迭代它,您可以使用本机JavaScrupt forEach:

checkbox_list.filter(function(elem, index) {
    // ...
})
.then(function(filteredElements) {
    filteredElements.forEach(function(element, index) {
        // ....
    });
});

否则,ElementArrayFinder有它自己的方法each,你应该在结果上调用它filter,而不是在回调中then:

checkbox_list.filter(function(elem, index) {
    // ...
})
.each(function(element, index) {
    // ....
});

也许源代码ElementArrayFinder也可以帮助你.