[Selenium]怎样等待元素出现之后再消失，譬如Loading icon

界面上有些元素是要先等它出现，再等它消失，譬如loading icon

这个是等多个loading icon出现后消失

/**
* Wait for loading icon disappear in dialog and Widgets
* @author jz
*/
public void waitForLoadingIconDisappearInDialog(WebDriver driver) {
System.out.println("Wait for loading icons display in dialog or widgets.");
Function<WebDriver, Boolean> waitFn = new Function<WebDriver, Boolean>() {
@Override
public Boolean apply(WebDriver driver) {
try {
for (WebElement el : driver.findElements(By.cssSelector("div.win-bd-mask[style*='display: block'] div.win-bd-mask-waiting"))) {
if (el.isDisplayed()) {
System.out.println("Loading icon display in dialog or widgets.");
return false;
}
}
}
catch (Exception ex) {
return true;
}
return true;
}
};

WebDriverWait wait = new WebDriverWait(driver, 120, 1000);
wait.withMessage("Loading icons should disppear in dialog or widgets in 120s");
wait.until(waitFn);
System.out.println("Loading icons disspear in dialog or widgets.");
}

这个是等一个loading icon 出现后消失

public void waitForLoadingIconDisappearInNewWebPage(WebDriver driver) {
System.out.println("Wait for loading icon display in new web page.");
final By cssSelector=By.cssSelector("div.x-mask-msg");
Function<WebDriver, Boolean> waitFn = new Function<WebDriver, Boolean>() {
public Boolean apply(WebDriver driver) {
try{
if(driver.findElement(cssSelector).isDisplayed()){
System.out.println("Loading icon display in new web page.");
return false;
}
}
catch(Exception e){
return true;
}
return true;
}
};
WebDriverWait wait = new WebDriverWait(driver, 120, 2000);
wait.withMessage("Loading icon should disappear in new web page in 120s");
wait.until(waitFn);
System.out.println("Loading icon disappear in new web page.");
}

如果等显现的元素变成隐藏，相对要简单一些，先等它可见，再等它不可见

public void waitForLoadingIconDisappearInHomePage(WebDriver driver) {
this.waitForElementVisible(driver, By.cssSelector("div#window-waiting-box"), 20 ,"Waiting box should display in 20s");
this.waitForElementNotVisible(driver, By.cssSelector("div#window-waiting-box"), 120 ,"Waiting box should disppear in 120s");
}