[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){<br>                        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.");
        } 
    }