[Selenium]等待元素出现之后再消失，界面上的loading icon都属于这种类型，之前的方法总是卡死，换这种方法目前还好用的

等待元素出现之后再消失，界面上的loading icon都属于这种类型，之前的方法总是卡死，换这种方法目前还好用的

/**
     * Check if the element present with customized timeout
     * @param driver
     * @param locator
     * @param errorMessage
	 * @return
	 */
	public Boolean waitUntilElementPresent(WebDriver driver,final By locator, long timeOutInSeconds) {
		Boolean isPresent = false;
		for(int i=0;i<timeOutInSeconds;i++){
			isPresent=SeleniumUtil.isElementPresent(driver,locator);
			if(true==isPresent){
				break;
			}
			else{
				SeleniumUtil.sleep(1);
				System.out.println("Wait no more than "+timeOutInSeconds+"s for loading icon display, wait "+(i+1)+"s");
			}
		}
		return isPresent;
	}

/**
     * Wait until the element not present with customized timeout
     * @param driver
     * @param locator
     * @param errorMessage
	 * @return
	 */
	public Boolean waitUntilElementNotPresent(WebDriver driver,final By locator, long timeOutInSeconds) {
		Boolean isPresent = true;
		for(int i=0;i<timeOutInSeconds;i++){
			isPresent=SeleniumUtil.isElementPresent(driver,locator);
			if(false==isPresent){
				break;
			}
			else{
				SeleniumUtil.sleep(1);
				System.out.println("Wait no more than "+timeOutInSeconds+"s for loading icon disappear, wait "+(i+1)+"s");
			}
		}
		return isPresent;
	}

public void waitForLoadingDoneInNewWebPage(WebDriver driver){
		By locator=By.cssSelector("div.x-mask-msg");
		Boolean isPresent = this.waitUntilElementPresent(driver, locator, 10);
		if(true==isPresent){
                        System.out.println("Loading icon display in new web page");
			System.out.println("Wait for loading icon disappear in new web page");
			Boolean stillPresent = this.waitUntilElementNotPresent(driver, locator, 120);
			if(false==stillPresent){
				System.out.println("Loading icon disappear in new web page.");
			}
		}
		else{
			System.out.println("Loading icon does'nt display in new web page.");
		} 
	}