Selenium WebDriver JS - 显式等待 [英] Selenium WebDriver JS - Explicit Wait

问题描述

我正在使用 selenium-webdriverjs.我想等待某个元素被显示，我为它创建了一个显式等待，如下所示，它工作得很好，

I am using the selenium-webdriverjs. I want to wait for a certain element to be displayed for which I have created an explicit wait as follows and it works just fine,

var displayed = false;
driver.wait(function(){
    driver.findElement(locator).isDisplayed().then(function(value){
        displayed = value;
    });
    return displayed;
}, timeout);

这是我能做的最好的事情还是有更好的方法来做到这一点?我问的原因是第一次调用等待回调(在我的情况下)它总是返回 false.只有随后执行 isDisplayed 承诺时，display 的值才会改变.

Is this the best I can do or is there a better way to do this? The reason I ask is that the first time ever the wait callback is called (in my case) it will always return false. Only subsequently when the isDisplayed promise is executed will the value of displayed change.

推荐答案

您的代码混合了同步返回和异步回调，以下代码应该做正确的事情:

Your code is mixing a synchronous return with asynchronous callbacks, the following code should do the right thing:

return driver.wait(function() {
    return driver.findElement(locator).isDisplayed();
}, timeout);

内部函数将返回一个 driver.wait 将等待的承诺，并将其值(真/假)作为等待条件.

The inner function will return a promise that driver.wait will wait for and will take its value (true/false) as the waiting condition.

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