Is it possible for my WebDriver script to detect an event triggered by the webpage?

Question

Is it possible for my WebDriver script to detect an event triggered by the webpage?

Is it feasible for my WebDriver script to carry out specific tests after a particular event is triggered on the webpage?

Within the WebDriver script, I envision some form of event listener:

document.addEventListener("hello", function(){
    console.log("performing tests");
});

This code would be activated when the webpage executes:

var ev = new Event("hello");
document.dispatchEvent(ev);

Alternatively, could I trigger an event from WebDriver to the webpage in the reverse direction?

javascript selenium selenium-webdriver

Answer 1

Answer №1

Absolutely, you can definitely listen to an event.

For instance, in this particular scenario, the code is set up to listen for the "change" event on a file input:

from selenium import webdriver
driver = webdriver.Firefox()
driver.get("http://fiddle.jshell.net/lovlka/N4Jxk/show/")

driver.switch_to_frame(0)
driver.set_script_timeout(30)

# locate the input element
input_elem = driver.find_element_by_css_selector("#uploadFile")

# attach an event listener to the element
driver.execute_script("""\
  arguments[0].addEventListener("change", function onchange() {
    this.removeEventListener("change", onchange);
    window.__file__ = true;
  });
  window.__file__ = false;
  """, input_elem)

# upload the specified file
input_elem.send_keys(r"C:\text.txt")

# wait for the file to be processed
driver.execute_async_script("""\
  var callback = arguments[0];
  (function fn(){
    if(window.__file__)
      return callback();
    setTimeout(fn, 60);
  })();
  """)

Moreover, it's also entirely possible to trigger an event programmatically.

In this example, we are simulating a text drop using HTML5 technology:

from selenium import webdriver
driver = webdriver.Firefox()
driver.get("http://html5demos.com/drag-anything")

drop_element = driver.find_element_by_id("drop")
drop_format = "text/message"
drop_text = "my text"

driver.execute_script("""\
  var tgt = arguments[0], format = arguments[1], data = arguments[2],
  dataTransfer = {
    dropEffect: '',
    effectAllowed: 'all',
    files: [ ],
    items: { format: data },
    types: [ format ],
    getData: function (format) { return data; },
    clearData: function (format) { }
  };
  var emit = function (event, target) {
    var evt = document.createEvent('Event');
    evt.initEvent(event, true, false);
    evt.dataTransfer = dataTransfer;
    target.dispatchEvent(evt);
  };
  emit('dragenter', tgt);
  emit('dragover', tgt);
  emit('drop', tgt);
  """, drop_element, drop_format, drop_text)

Answer 2

Absolutely, you can definitely listen to an event.

For instance, in this particular scenario, the code is set up to listen for the "change" event on a file input:

from selenium import webdriver
driver = webdriver.Firefox()
driver.get("http://fiddle.jshell.net/lovlka/N4Jxk/show/")

driver.switch_to_frame(0)
driver.set_script_timeout(30)

# locate the input element
input_elem = driver.find_element_by_css_selector("#uploadFile")

# attach an event listener to the element
driver.execute_script("""\
  arguments[0].addEventListener("change", function onchange() {
    this.removeEventListener("change", onchange);
    window.__file__ = true;
  });
  window.__file__ = false;
  """, input_elem)

# upload the specified file
input_elem.send_keys(r"C:\text.txt")

# wait for the file to be processed
driver.execute_async_script("""\
  var callback = arguments[0];
  (function fn(){
    if(window.__file__)
      return callback();
    setTimeout(fn, 60);
  })();
  """)

Moreover, it's also entirely possible to trigger an event programmatically.

In this example, we are simulating a text drop using HTML5 technology:

from selenium import webdriver
driver = webdriver.Firefox()
driver.get("http://html5demos.com/drag-anything")

drop_element = driver.find_element_by_id("drop")
drop_format = "text/message"
drop_text = "my text"

driver.execute_script("""\
  var tgt = arguments[0], format = arguments[1], data = arguments[2],
  dataTransfer = {
    dropEffect: '',
    effectAllowed: 'all',
    files: [ ],
    items: { format: data },
    types: [ format ],
    getData: function (format) { return data; },
    clearData: function (format) { }
  };
  var emit = function (event, target) {
    var evt = document.createEvent('Event');
    evt.initEvent(event, true, false);
    evt.dataTransfer = dataTransfer;
    target.dispatchEvent(evt);
  };
  emit('dragenter', tgt);
  emit('dragover', tgt);
  emit('drop', tgt);
  """, drop_element, drop_format, drop_text)

Answer 3

Answer №2

While this question may be old, I wanted to provide some additional information that could be helpful. It's worth noting that the topic of discussion is the Javascript implementation of webdriver, specifically webdriverjs.

If you need to add browser-supported events, you can use the addEventListener command. Please keep in mind that this feature is currently only supported in Chrome.

It's important to mention that this functionality is considered experimental in webdriver.js, so you'll have to make sure to include the necessary configuration:

var client = WebdriverJS.remote({
    logLevel: 'verbose',
    experimental: true, // <-- enables browser side eventhandling
    desiredCapabilities: {
        browserName: 'chrome'
    }
});

After setting up the configuration, you can register events like this:

client
    .url('http://google.com')
    .addEventListener('dblclick','#hplogo', function(e) {
        console.log(e.target); // -> 'id("hplogo")'
        console.log(e.type); // -> 'dblclick'
        console.log(e.clientX, e.clientY); // -> 239 524
    })
    .doubleClick('#hplogo') // triggers event
    .end();

To remove any registered listeners, you can utilize the removeEventListener method.

In addition, it's worth mentioning that event handling in a Node.js environment is also supported, as indicated by the fact that

WebdriverJS inherits several functions from the NodeJS EventEmitter object

.

Answer 4

While this question may be old, I wanted to provide some additional information that could be helpful. It's worth noting that the topic of discussion is the Javascript implementation of webdriver, specifically webdriverjs.

If you need to add browser-supported events, you can use the addEventListener command. Please keep in mind that this feature is currently only supported in Chrome.

It's important to mention that this functionality is considered experimental in webdriver.js, so you'll have to make sure to include the necessary configuration:

var client = WebdriverJS.remote({
    logLevel: 'verbose',
    experimental: true, // <-- enables browser side eventhandling
    desiredCapabilities: {
        browserName: 'chrome'
    }
});

After setting up the configuration, you can register events like this:

client
    .url('http://google.com')
    .addEventListener('dblclick','#hplogo', function(e) {
        console.log(e.target); // -> 'id("hplogo")'
        console.log(e.type); // -> 'dblclick'
        console.log(e.clientX, e.clientY); // -> 239 524
    })
    .doubleClick('#hplogo') // triggers event
    .end();

To remove any registered listeners, you can utilize the removeEventListener method.

In addition, it's worth mentioning that event handling in a Node.js environment is also supported, as indicated by the fact that

WebdriverJS inherits several functions from the NodeJS EventEmitter object

.

Is it possible for my WebDriver script to detect an event triggered by the webpage?

Answer №1

Answer №2

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