量角器 - 等待多个元素 [英] Protractor - Wait for multiple elements

问题描述

我正在尝试等待页面上的多个元素，我不知道会有多少元素，但至少会有一个元素。我理解使用以下内容等待单个元素，效果很好。

I am trying to wait for multiple elements on the page, I don't know how many there could be but there will be at least one. I understand waiting for a single element using the following, which works fine.

var EC = protractor.ExpectedConditions;
    browser.wait(EC.presenceOf(element(by.css("h3[title='Test Form']"))), 10000);
    expect(element(by.css("h3[title='Test Form']")).isPresent()).toBeTruthy();

我想稍微改变一下等待多个元素，所以尝试了下面的内容（添加.all到元素）。

I wanted to change this slightly to wait for multiple elements and so tried the below (adding .all to element).

var EC = protractor.ExpectedConditions;
    browser.wait(EC.presenceOf(element.all(by.css("h3[title='Test Form']"))), 10000);
    expect(element.all(by.css("h3[title='Test Form']")).isPresent()).toBeTruthy();

不幸的是，当我尝试这个时，我得到了

Unfortunately when I try this I get

Cannot read property 'bind' of undefined

任何帮助非常感谢。

ps Protracor的新手及其怪癖。

p.s. Newbie to Protracor and its quirks.

推荐答案

presenceOf 需要单个元素（ ElementFinder ）要传入。

您需要等待的自定义预期条件。如果我理解正确，你需要等到N个元素存在。以下是如何做到这一点：

You would need a custom Expected Condition to wait for. If I understand you correctly, you need to wait until N elements are present. Here is how you can do it:

function waitForCount (elementArrayFinder, expectedCount) {
    return function () {
        return elementArrayFinder.count().then(function (actualCount) {
            return expectedCount === actualCount;  // or <= instead of ===, depending on the use case
        });
    };
};

用法：

var forms = element.all(by.css("h3[title='Test Form']"));
browser.wait(waitForCount(forms, 5), 10000);

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