等待 get 请求在 selenium 中完成

Question

对于这个例子，让我们看看网站 pinterest：

当我进行初始登录时，会加载一些图钉。 为了获得更多图钉，我需要滚动到页面末尾，在请求更多图钉之后（我想很多网站的工作方式都是这样）

所以我知道如何在 selenium 中进行滚动，但是我如何等待请求结束？

我的意思是，它不是在等待某个元素出现，那种元素（大头针）已经存在，但我正在等待其他元素出现。

如果我使用带有等待的预期条件，这对第一批引脚有好处，但是那些添加到它们的引脚，我如何等待它们，例如：

当 pinterest 首次加载时->

WebDriverWait driverWait = new WebDriverWait(cd, 10, 1000);

element = driverWait.until(ExpectedConditions.visibilityOfElementLocated(By.xpath("thepins")));

这对于初始加载非常有用，现在我滚动到页面底部

((JavascriptExecutor) cd).executeScript("window.scrollTo(0, document.body.scrollHeight)");

现在取决于页面，加载到更多引脚（有时不是）我想等待它们加载，然后再进行另一个滚动。

解决这种情况的最佳方法是什么？

Answer 1

我这样做的方法是使用页面上的元素数量。所以例如你可以这样做：

int pinCount = webDriver.findElements(By.xpath("thepins")).size();

此时为滚动运行你的 jsExecutor，然后：

webDriverWait.until(ExpectedConditions.numberOfElementsToBeMoreThan(By.xpath("thepins"),pinCount ));

Answer 2

我认为处理这个问题的最好方法是让课程拥有所有的可能性，而不是从需要等待的地方调用它，下面的代码会发挥作用，对我来说效果很好

import org.openqa.selenium.JavascriptExecutor;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.support.ui.ExpectedCondition;
import org.openqa.selenium.support.ui.WebDriverWait;

public class Waiter {

    private static WebDriver jsWaitDriver;
    private static WebDriverWait jsWait;
    private static JavascriptExecutor jsExec;

    //Get the driver 
    public static void setDriver (WebDriver driver) {
        jsWaitDriver = driver;
        jsWait = new WebDriverWait(jsWaitDriver, 45);
        jsExec = (JavascriptExecutor) jsWaitDriver;
    }

    //Wait for JQuery Load
    public static void waitForJQueryLoad() {
        //Wait for jQuery to load
        ExpectedCondition<Boolean> jQueryLoad = driver -> ((Long) ((JavascriptExecutor) jsWaitDriver)
                .executeScript("return jQuery.active") == 0);

        //Get JQuery is Ready
        boolean jqueryReady = (Boolean) jsExec.executeScript("return jQuery.active==0");

        //Wait JQuery until it is Ready!
        if(!jqueryReady) {
            System.out.println("JQuery is NOT Ready!");
            //Wait for jQuery to load
            jsWait.until(jQueryLoad);
        } else {
            System.out.println("JQuery is Ready!");
        }
    }

    //Wait for Angular Load
    public static void waitForAngularLoad() {
        WebDriverWait wait = new WebDriverWait(jsWaitDriver,45);
        JavascriptExecutor jsExec = (JavascriptExecutor) jsWaitDriver;

        String angularReadyScript = "return angular.element(document).injector().get('$http').pendingRequests.length === 0";

        //Wait for ANGULAR to load
        ExpectedCondition<Boolean> angularLoad = driver -> Boolean.valueOf(((JavascriptExecutor) driver)
                .executeScript(angularReadyScript).toString());

        //Get Angular is Ready
        boolean angularReady = Boolean.valueOf(jsExec.executeScript(angularReadyScript).toString());

        //Wait ANGULAR until it is Ready!
        if(!angularReady) {
            System.out.println("ANGULAR is NOT Ready!");
            //Wait for Angular to load
            wait.until(angularLoad);
        } else {
            System.out.println("ANGULAR is Ready!");
        }
    }

    //Wait Until JS Ready
    public static void waitUntilJSReady() {
        WebDriverWait wait = new WebDriverWait(jsWaitDriver,45);
        JavascriptExecutor jsExec = (JavascriptExecutor) jsWaitDriver;

        //Wait for Javascript to load
        ExpectedCondition<Boolean> jsLoad = driver -> ((JavascriptExecutor) jsWaitDriver)
                .executeScript("return document.readyState").toString().equals("complete");

        //Get JS is Ready
        boolean jsReady =  (Boolean) jsExec.executeScript("return document.readyState").toString().equals("complete");

        //Wait Javascript until it is Ready!
        if(!jsReady) {
            System.out.println("JS in NOT Ready!");
            //Wait for Javascript to load
            wait.until(jsLoad);
        } else {
            System.out.println("JS is Ready!");
        }
    }

    //Wait Until JQuery and JS Ready
    public static void waitUntilJQueryReady() {
        JavascriptExecutor jsExec = (JavascriptExecutor) jsWaitDriver;

        //First check that JQuery is defined on the page. If it is, then wait AJAX
        Boolean jQueryDefined = (Boolean) jsExec.executeScript("return typeof jQuery != 'undefined'");
        if (jQueryDefined == true) {
            //Pre Wait for stability (Optional)
            sleep(30);

            //Wait JQuery Load
            waitForJQueryLoad();

            //Wait JS Load
            waitUntilJSReady();

            //Post Wait for stability (Optional)
            sleep(30);
        }  else {
            System.out.println("jQuery is not defined on this site!");
        }
    }

    //Wait Until Angular and JS Ready
    public static void waitUntilAngularReady() {
        JavascriptExecutor jsExec = (JavascriptExecutor) jsWaitDriver;

        //First check that ANGULAR is defined on the page. If it is, then wait ANGULAR
        Boolean angularUnDefined = (Boolean) jsExec.executeScript("return window.angular === undefined");
        if (!angularUnDefined) {
            Boolean angularInjectorUnDefined = (Boolean) jsExec.executeScript("return angular.element(document).injector() === undefined");
            if(!angularInjectorUnDefined) {
                //Pre Wait for stability (Optional)
                sleep(30);

                //Wait Angular Load
                waitForAngularLoad();

                //Wait JS Load
                waitUntilJSReady();

                //Post Wait for stability (Optional)
                sleep(30);
            } else {
                System.out.println("Angular injector is not defined on this site!");
            }
        }  else {
            System.out.println("Angular is not defined on this site!");
        }
    }

    //Wait Until JQuery Angular and JS is ready
    public static void waitJQueryAngular() {
        waitUntilJQueryReady();
        waitUntilAngularReady();
    }

    public static void sleep (Integer seconds) {
        long secondsLong = (long) seconds;
        try {
            Thread.sleep(secondsLong);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}

Answer 3

如果您知道总共会显示多少个图钉，您可以使用：

// new wait 30 seconds
WebDriverWait wait30s = new WebDriverWait(driver,30);
wait30s.until(ExpectedConditions.numberOfElementsToBe("THIS LOCATOR MUST FIT TO ALL PINS", number));

// or
wait30s.until(ExpectedConditions.numberOfElementsToBeMoreThan("THIS LOCATOR MUST FIT TO ALL PINS", number));