javascript 量角器计数元素并存储整数

Protractor count elements and store the integer

提问by Osan

I want to count the elements in a list and then access the integer, not a Promiseobject. So starting with:

我想计算列表中的元素，然后访问整数，而不是Promise对象。所以开始：

var questionList = questionContainer.all(by.className('someclass'));

If there are three child elements with that class, I want console.log(questionList.count())to output the integer 3, not a Promiseobject. Is this even possible? Even if it is some operation on the Promise.

如果该类有三个子元素，我想console.log(questionList.count())输出 integer 3，而不是一个Promise对象。这甚至可能吗？即使是对Promise.

回答by alecxe

protractorhas the count()method available on ElementArrayFinder:

protractor有count()可用的方法ElementArrayFinder：

expect(questionList.count()).toEqual(3);

Note that count()returns a promise, expect()is "patched" to resolve promises implicitly.

请注意，count()返回一个 promise，expect()被“修补”以隐式解决承诺。

If you need the actual value to be, for instance, printed on the console - resolve the promise explicitly with then():

例如，如果您需要将实际值打印在控制台上 - 使用then()以下命令明确解析承诺：

questionList.count().then(function (count) {
    console.log(count);
});

Or, even simpler:

或者，更简单：

questionList.count().then(console.log);

回答by winlinuz

And, for instance, store the integer for using if statement?

并且，例如，存储整数以使用 if 语句？

questionList.count().then(function (count) {
     var res = count; 
});

if (res < 3) ...

It would be this way?

会是这样吗？