如何使用Selenium单击网页上的打印按钮

Question

我想点击此页面中的打印按钮:

https://www.google.com/maps/dir/40.4515849,-3.6903752/41.380896,2.1228198/@40.4515849,-3.6903752/am=t/?hl=en

然后保存PDF ...

这是单击按钮的代码:

String url = "https://www.google.com/maps/dir/40.4515849,-3.6903752/41.380896,2.1228198/@40.4515849,-3.6903752/am=t/?hl=en";

WebDriver driver = new HtmlUnitDriver();
driver.get(url);

System.out.println(driver.getTitle());
System.out.println(driver.getCurrentUrl());

WebElement element = driver.findElement(By.xpath("//*[@id=\"text-mode-options-header\"]/div/div/div[2]/div[2]/div/button[1]"));
element.click();

System.out.println("Page title is: " + driver.getTitle());
driver.quit();

但是我收到以下错误:

    Exception in thread "main" org.openqa.selenium.NoSuchElementException: Unable to locate a node using //*[@id="text-mode-options-header"]/div/div/div[2]/div[2]/div/button[1]
For documentation on this error, please visit: http://seleniumhq.org/exceptions/no_such_element.html
Build info: version: '2.43.1', revision: '5163bce', time: '2014-09-10 16:27:58'
Driver info: driver.version: HtmlUnitDriver
    at org.openqa.selenium.htmlunit.HtmlUnitDriver.findElementByXPath(HtmlUnitDriver.java:1057)
    at org.openqa.selenium.By$ByXPath.findElement(By.java:357)
    at org.openqa.selenium.htmlunit.HtmlUnitDriver$5.call(HtmlUnitDriver.java:1575)
    at org.openqa.selenium.htmlunit.HtmlUnitDriver$5.call(HtmlUnitDriver.java:1)
    at org.openqa.selenium.htmlunit.HtmlUnitDriver.implicitlyWaitFor(HtmlUnitDriver.java:1251)
    at org.openqa.selenium.htmlunit.HtmlUnitDriver.findElement(HtmlUnitDriver.java:1572)
    at org.openqa.selenium.htmlunit.HtmlUnitDriver.findElement(HtmlUnitDriver.java:532)
    at com.controlstation.start.Main.main(Main.java:24)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:483)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:134)

我怎么能用Selenium做到这一点？有另一种方式吗？谢谢.

编辑:

Answer 1

这是我的见解.

首先,您需要等待页面加载才能与Print按钮进行交互.最好的方法是使用内置机制:selenium 等待 - 等待Print按钮可点击:

// open print dropdown
WebDriverWait wait = new WebDriverWait(driver, 10);
wait.until(ExpectedConditions.elementToBeClickable(By.cssSelector("button.print-button"))).click();

// click print button
WebElement printButton = driver.findElement(By.cssSelector("button.print-popup-button"));
printButton.click();

好的,如果你使用ChromeDriver以下方式运行它:

package com.company;

import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.chrome.ChromeDriver;
import org.openqa.selenium.support.ui.ExpectedConditions;
import org.openqa.selenium.support.ui.WebDriverWait;


public class Main {
    public static void main(String[] args) {
        String url = "https://www.google.com/maps/dir/40.4515849,-3.6903752/41.380896,2.1228198/@40.4515849,-3.6903752/am=t/?hl=en";

        WebDriver driver = new ChromeDriver();
        driver.get(url);

        // open print dropdown
        WebDriverWait wait = new WebDriverWait(driver, 10);
        wait.until(ExpectedConditions.elementToBeClickable(By.cssSelector("button.print-button"))).click();

        // click print button
        WebElement printButton = driver.findElement(By.cssSelector("button.print-popup-button"));
        printButton.click();

        // now what? 
    }
}

您会看到Chrome打印预览对话框,遗憾的是,该对话框超出了selenium的范围:

但是,如果您查看可用的Chrome参数,您会发现存在相关问题:

--disable-print-preview - 禁用打印预览(用于测试,以及不喜欢我们的用户.:[]

好的,让我们试一试:

ChromeOptions options = new ChromeOptions();
options.addArguments("--disable-print-preview");

WebDriver driver = new ChromeDriver(options);
driver.get(url);

现在,显示了一个系统打印对话框:

硒也无法控制它.所以,不,没有希望.等一下!

好的,如果我们超出了selenium的范围,让我们使用可以帮助我们Print在对话框中单击该按钮的工具- Robot类:

此类用于生成本机系统输入事件,以用于测试自动化,自运行演示以及需要控制鼠标和键盘的其他应用程序.

我们将初始化Robot并Enter在打印对话框出现时发送密钥:

package com.company;

import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.chrome.ChromeDriver;
import org.openqa.selenium.support.ui.ExpectedConditions;
import org.openqa.selenium.support.ui.WebDriverWait;

import java.awt.*;
import java.awt.event.KeyEvent;


public class Main {
    public static void main(String[] args) throws AWTException, InterruptedException {
        String url = "https://www.google.com/maps/dir/40.4515849,-3.6903752/41.380896,2.1228198/@40.4515849,-3.6903752/am=t/?hl=en";

        Robot r = new Robot();
        r.delay(1000);

        WebDriver driver = new ChromeDriver();
        driver.get(url);

        // open print dropdown
        WebDriverWait wait = new WebDriverWait(driver, 10);
        wait.until(ExpectedConditions.elementToBeClickable(By.cssSelector("button.print-button"))).click();

        // click print button
        WebElement printButton = driver.findElement(By.cssSelector("button.print-popup-button"));
        printButton.click();

        Thread.sleep(2000);

        r.keyPress(KeyEvent.VK_ENTER);
        r.keyRelease(KeyEvent.VK_ENTER);
    }
}

其他选择是使用:

• sikuli - 你需要一个打印按钮的图像,以便sikuli找到它并点击
• autoit

另见:

• 如何处理Selenium中的打印对话框？