我如何断言一个元素是焦点?

问题描述

我正在尝试验证焦点元素是否在页面加载时设置为我的测试之一.

I am attempting to verify that the focused element is set on page load as one of my tests.

这似乎有效，我可以使用元素浏览器进行验证，但 Jasmine 匹配器似乎没有注意到这一点.

This seems to be working, and I can verify with the element explorer, but the Jasmine matchers don't seem to pick up on this.

这是我的代码:

var LoginPage = function () {
    this.basePath = browser.params.baseUrl;
    this.loginPart = "/#/login";
    this.usernameInput = element(by.model('username'));

    this.get = function () { ... }
}

it('should focus on the username field on load', function () {
     loginPage.get();
     expect(loginPage.usernameInput).toBe(browser.driver.switchTo().activeElement());
});

当页面加载时，字段本身正确获得焦点(元素浏览器正确地允许我通过 browser.driver.switchTo().activeElement() 查询它，所以我认为这个测试应该通过，但它不是.

The field itself is correctly getting focus when the page loads (and element explorer correctly allows me to query this via browser.driver.switchTo().activeElement(), so I think this test should be passing, but it isn't.

相反，我得到了一个巨大的堆栈跟踪，它没有提供任何有用的信息.

Instead I get an enormous stacktrace which doesn't offer any useful information.

推荐答案

我想我找到了一个解决方法:

I think I found a workaround:

由于 expect 期望被一个 promise 调用，你可以比较两个 webElements(你的输入和当前的 activeElement)的一些属性:

Since expect expects to be called with a promise, you can compare some attribute of the two webElements (your input and the currently activeElement) :

it('should focus on the username field on load', function () {
     loginPage.get();
     expect(loginPage.usernameInput.getAttribute('id')).toEqual(browser.driver.switchTo().activeElement().getAttribute('id'));
});

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