硒findElements()/findElement(按类)返回null [英] Selenium findElements() / findElement(by class) returns null

问题描述

当我尝试使用webDriver搜索一个或多个元素时，它不返回任何内容. 操作系统:Ubuntu 14.04，框架:Intellij Idea，语言:Java.

When I try to search for an element or elements with the webDriver, it returns nothing. OS: Ubuntu 14.04, FrameWork: Intellij Idea, Language: Java.

我有以下这些陈述:

WebDriver myWebDriver = new FirefoxDriver();
String myClass = "hid";

并转到:

myWebDriver.navigate().to("https://www.youtube.com/");

所有这些都有效.但是当我声明:

All of that works. But when I declare:

 private List <WebElement> myElements = new ArrayList<WebElement>();

，然后像这样访问myElements:

and then access myElements as such:

myElements = myWebDriver.findElements(By.className(myClass));

myElements为null，因为findElements以及findElement(webElement)似乎都失败了(对于后者，我将List更改为常规WebElement).这以前曾奏效.

myElements is null as findElements seems to fail, as well as findElement(webElement) (with the latter, I changed the List to a regular WebElement). This has worked previously.

以及所有代码:

package com.search.mywork;
        import org.junit.Test;
        import org.openqa.selenium.*;
        import org.openqa.selenium.chrome.ChromeDriver;
        import org.openqa.selenium.firefox.FirefoxDriver;
        import java.util.ArrayList;
        import java.util.List;
        import java.util.Set;
        /**
         * Created by aby on 5/27/14.
         */

        public class searchWork {
            private long time = 5000;
            private String experience = "1-2 שנים";

            private WebDriver myWebDriver ;
            private WebElement mywebelement ;

            private List <WebElement> jobList = new  ArrayList<WebElement>();
            private List <WebElement> basketList = new  ArrayList<WebElement>();
            private List <WebElement> experienceList = new  ArrayList<WebElement>();
            private List <WebElement> myElements = new  ArrayList<WebElement>();

            private int i=0;
            private int t=0;

            String myClass=  "hid" ;

            private String myLastJobClicked = null;
            private String myLastJobClickedSearch = null;

            private void logIn(){
                //Create Driver and log in
                WebDriver myWebDriver = new FirefoxDriver();
        //        myWebDriver.navigate().to(" http://www.drushim.co.il/Enter.aspx");
        //        myWebDriver.findElement(By.id("MainContent_Login_EmailText")).sendKeys("");
        //        myWebDriver.findElement(By.id("MainContent_Login_PasswordText")).sendKeys("");
        //        myWebDriver.findElement(By.id("MainContent_SubmitLogin")).click();
        //        myWebDriver.navigate().to("http://www.drushim.co.il/jobs/subcat/68/?area=1");
                myWebDriver.navigate().to("https://www.youtube.com/");

            }

            private void searchForWeb(){
                //Go to web Search
                myWebDriver.navigate().to("http://www.drushim.co.il/jobs/subcat/68/?area=1");

                //Wait if needed

                synchronized (myWebDriver){
                    try {
                        myWebDriver.wait(time);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            } //Func not used

            private Boolean chkExperienceIsOk(String experienceFromWeb){
                //Check if Experience is ok
        //        if(experience == myWebDriver.findElement(By.className("additionalText")).getText()){
        //            myWebDriver.findElement(By.className("addToBaseketLink")).click();
        //        }
                return experience == experienceFromWeb ? true : false;
            }

            private void findelements(){
                try {
                    //jobList = myWebDriver.findElements(By.className("yt-dialog-loading"));
                    //jobList = myWebDriver.findElements(By.className("yt-dialog-loading"));
                    //mywebelement = myWebDriver.findElement(By.className("yt-dialog-loading"));
                    myElements = myWebDriver.findElements(By.className(myClass));
                    int i =0;
                    //basketList = myWebDriver.findElements(By.className("addToBaseketLink"));
                    //experienceList =  myWebDriver.findElements(By.className("additionalText"));
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }

            private void clickOnModaa(){

                for (WebElement jobElement : jobList){
                    jobElement.click();
                    for (WebElement basketElement : basketList){
                        for (WebElement experienceElement :experienceList)
                        if (chkExperienceIsOk(experienceElement.getText())){
                            basketElement.click();
                        }
                    }
                }
            }

            private void closeWebDriver(){
                myWebDriver.close();
            }

            @Test
            public void search (){

                logIn();
                //searchForWeb();
                findelements();


                }//end sear fucn

            }//end class

推荐答案

这是您的问题:

private void logIn(){
     //Create Driver and log in

    // myWebDriver is a Class field already
    // Remove WebDriver declaracion

    this.myWebDriver = new FirefoxDriver();

    myWebDriver.navigate().to("https://www.youtube.com/");
}

您正在创建一个新的WebDriver，因此在findElements函数中使用它时，它没有正确初始化.

You are creating a new WebDriver, so when you use it at findElements function it's not properly initialized.

希望这会有所帮助！

这篇关于硒findElements()/findElement(按类)返回null的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！