Execute async script in webDriver

Question

Here is usual javascript, which looks for hidden element.

   private RemoteWebElement getItemInSubmenu(WebElement parent, String itemName) {
        String script = "var el = jQuery(arguments[0].getElementsBySelector('div.rich-menu-list-bg>div.rich-menu-item>.rich-menu-item-label')).filter(function() {"
                + "return jQuery(this).text().trim() === '" + itemName + "'});"
                + "jQuery(el).parents('div.rich-menu-list-border:hide').show();"
                + "return el.get(0);";
        return (RemoteWebElement) browser.executeScript(script, parent);
    }

I want to make it asynchronous. How to implement callback?

What are you trying to do? Return an element with JavaScript? Any reason you can't get the WebElement directly? — NilsH
– NilsH, Commented Apr 16, 2013 at 11:47
And the code above is Java, the JavaScript you are seeing is the value of a Java String variable. — Ardesco
– Ardesco, Commented Apr 16, 2013 at 11:49
@Ardesco Yes, indeed, but there's also some JavaScript in there that is executed, as you can see. — NilsH
– NilsH, Commented Apr 16, 2013 at 11:52
@ArtemYakovlev Where's the callback? If you need the text of the element, can't you return that from the script instead of the element? — NilsH
– NilsH, Commented Apr 16, 2013 at 11:56

Ardesco · Accepted Answer · 2013-04-16 12:23:09Z

These are pulled directly from the Selenium JavaDoc which is available here:

http://selenium.googlecode.com/git/docs/api/java/index.html

Example #1: Performing a sleep in the browser under test.

long start = System.currentTimeMillis();
((JavascriptExecutor) driver).executeAsyncScript("window.setTimeout(arguments[arguments.length - 1], 500);");
System.out.println("Elapsed time: " + System.currentTimeMillis() - start);

Example #2: Synchronizing a test with an AJAX application

WebElement composeButton = driver.findElement(By.id("compose-button"));
composeButton.click();
((JavascriptExecutor) driver).executeAsyncScript(
  "var callback = arguments[arguments.length - 1];" +
  "mailClient.getComposeWindowWidget().onload(callback);");
driver.switchTo().frame("composeWidget");
driver.findElement(By.id("to")).sendKeys("[email protected]");

Example #3: Injecting a XMLHttpRequest and waiting for the result:

Object response = ((JavascriptExecutor) driver).executeAsyncScript(
    "var callback = arguments[arguments.length - 1];" +
    "var xhr = new XMLHttpRequest();" +
    "xhr.open('GET', '/resource/data.json', true);" +
    "xhr.onreadystatechange = function() {" +
    "  if (xhr.readyState == 4) {" +
    "    callback(xhr.responseText);" +
    "  }" +
    "}" +
    "xhr.send();");
JSONObject json = new JSONObject((String) response);
assertEquals("cheese", json.getString("food"));

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