Waiting for JavaScript event with Selenium

Question

I am building an automation framework on top of Selenium (Node.js) consisting on a number of steps. Each step follows the previous one, after it completes, returning a promise (like the one returned by Selenium's driver.click(), etc). Is it possible to wait for a JavaScript event to trigger on the browser? If so, what is the pattern to follow?

do you mean wait until your java script fully executed and returned using selenium? — Saurabh Gaur
– Saurabh Gaur, Commented Jun 9, 2016 at 11:23
No, I meant what I said: wait for a JavaScript event to trigger. Waiting for a script to execute is trivial using driver.executeScript(). — Ricardo Peres
– Ricardo Peres, Commented Jun 9, 2016 at 11:32
For example, I would like to inject window.onmessage = function() { ... continue with the node.js promise chain ... } — Ricardo Peres
– Ricardo Peres, Commented Jun 9, 2016 at 11:33

Florent B. · Accepted Answer · 2016-06-09 11:52:53Z

4

Use .executeAsyncScript to wait for an event to occur :

driver.executeAsyncScript(function(callback) {
  window.addEventListener('message', function onmessage() {
    window.removeEventListener('message', onmessage);
    callback();
  });
});

The doc:

http://seleniumhq.github.io/selenium/docs/api/javascript/module/selenium-webdriver/lib/webdriver_exports_WebDriver.html#executeAsyncScript

answered Jun 9, 2016 at 11:52

Florent B.

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