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Use Promise in example for #evaluate_async #325

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Use Promise in example for #evaluate_async #325

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10 changes: 7 additions & 3 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -826,15 +826,19 @@ browser.evaluate("[window.scrollX, window.scrollY]")

#### evaluate_async(expression, wait_time, \*args)

Evaluate asynchronous expression and return result
Evaluate an asynchronous expression and return result

* expression `String` should be valid JavaScript
* expression `String` should be valid JavaScript, and include the fulfill callback: `__f()`
* wait_time How long we should wait for Promise to resolve or reject
* args `Object` you can pass arguments, though it should be a valid `Node` or a
simple value.

```ruby
browser.evaluate_async(%(arguments[0]({foo: "bar"})), 5) # => { "foo" => "bar" }
browser.evaluate_async <<JS, 5
fetch("https://www.httpbin.org/json")
.then(response => response.json())
.then(body => __f(body))
JS
```

#### execute(expression, \*args)
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