Class: Puppeteer::ElementHandle

Inherits:
JSHandle
  • Object
show all
Includes:
DebugPrint, IfPresent
Defined in:
lib/puppeteer/element_handle.rb,
lib/puppeteer/element_handle/point.rb,
lib/puppeteer/element_handle/box_model.rb,
lib/puppeteer/element_handle/bounding_box.rb

Defined Under Namespace

Classes: BoundingBox, BoxModel, ElementNotFoundError, ElementNotVisibleError, Point, ScrollIntoViewError

Instance Attribute Summary

Attributes inherited from JSHandle

#context, #remote_object

Instance Method Summary collapse

Methods included from IfPresent

#if_present

Methods included from DebugPrint

#debug_print, #debug_puts

Methods inherited from JSHandle

#[], create, #dispose, #disposed?, #evaluate, #evaluate_handle, #execution_context, #json_value, #properties, #property, #to_s

Constructor Details

#initialize(context:, client:, remote_object:, page:, frame_manager:) ⇒ ElementHandle

Returns a new instance of ElementHandle.

Parameters:



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# File 'lib/puppeteer/element_handle.rb', line 15

def initialize(context:, client:, remote_object:, page:, frame_manager:)
  super(context: context, client: client, remote_object: remote_object)
  @page = page
  @frame_manager = frame_manager
  @disposed = false
end

Instance Method Details

#as_element ⇒ Object 



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# File 'lib/puppeteer/element_handle.rb', line 22

def as_element
  self
end

#bounding_box ⇒ BoundingBox|nil

Returns:



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# File 'lib/puppeteer/element_handle.rb', line 246

def bounding_box
  if_present(box_model) do |result_model|
    quads = result_model.border

    x = quads.map(&:x).min
    y = quads.map(&:y).min
    BoundingBox.new(
      x: x,
      y: y,
      width: quads.map(&:x).max - x,
      height: quads.map(&:y).max - y,
    )
  end
end

#box_model ⇒ BoxModel|nil

Returns:



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# File 'lib/puppeteer/element_handle.rb', line 262

def box_model
  if_present(@remote_object.box_model(@client)) do |result|
    BoxModel.new(result['model'])
  end
end

#click(delay: nil, button: nil, click_count: nil) ⇒ Object

Parameters:

  • delay (Number) (defaults to: nil)
  • button (String) (defaults to: nil) —

    “left”|“right”|“middle”

  • click_count (Number) (defaults to: nil) 


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# File 'lib/puppeteer/element_handle.rb', line 142

def click(delay: nil, button: nil, click_count: nil)
  scroll_into_view_if_needed
  point = clickable_point
  @page.mouse.click(point.x, point.y, delay: delay, button: button, click_count: click_count)
end

#clickable_point ⇒ Object 



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# File 'lib/puppeteer/element_handle.rb', line 82

def clickable_point
  result =
    begin
      @remote_object.content_quads(@client)
    rescue => err
      debug_puts(err)
      nil
    end

  if !result || result["quads"].empty?
    raise ElementNotVisibleError.new
  end

  # Filter out quads that have too small area to click into.
  layout_metrics = @client.send_message('Page.getLayoutMetrics')
  client_width = layout_metrics["layoutViewport"]["clientWidth"]
  client_height = layout_metrics["layoutViewport"]["clientHeight"]

  quads = result["quads"].
            map { |quad| from_protocol_quad(quad) }.
            map { |quad| intersect_quad_with_viewport(quad, client_width, client_height) }.
            select { |quad| compute_quad_area(quad) > 1 }
  if quads.empty?
    raise ElementNotVisibleError.new
  end

  # Return the middle point of the first quad.
  quads.first.reduce(:+) / 4
end

#content_frame ⇒ Object 



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# File 'lib/puppeteer/element_handle.rb', line 26

def content_frame
  node_info = @remote_object.node_info(@client)
  frame_id = node_info['node']['frameId']
  if frame_id.is_a?(String)
    @frame_manager.frame(frame_id)
  else
    nil
  end
end

#focus ⇒ Object 



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# File 'lib/puppeteer/element_handle.rb', line 220

def focus
  evaluate('element => element.focus()')
end

#hover ⇒ Object 



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# File 'lib/puppeteer/element_handle.rb', line 133

def hover
  scroll_into_view_if_needed
  point = clickable_point
  @page.mouse.move(point.x, point.y)
end

#intersecting_viewport? ⇒ Boolean

in JS, #isIntersectingViewport.

Returns:

  • (Boolean) 


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# File 'lib/puppeteer/element_handle.rb', line 410

def intersecting_viewport?
  js = <<~JAVASCRIPT
  async element => {
    const visibleRatio = await new Promise(resolve => {
      const observer = new IntersectionObserver(entries => {
        resolve(entries[0].intersectionRatio);
        observer.disconnect();
      });
      observer.observe(element);
    });
    return visibleRatio > 0;
  }
  JAVASCRIPT

  evaluate(js)
end

#press(key, delay: nil, text: nil) ⇒ Object

Parameters:

  • key (String)
  • text (String) (defaults to: nil)
  • delay (number|nil) (defaults to: nil) 


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# File 'lib/puppeteer/element_handle.rb', line 238

def press(key, delay: nil, text: nil)
  focus
  @page.keyboard.press(key, delay: delay, text: text)
end

#S(selector) ⇒ Object

‘$()` in JavaScript. $ is not allowed to use as a method name in Ruby.

Parameters:

  • selector (String) 


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# File 'lib/puppeteer/element_handle.rb', line 319

def S(selector)
  handle = evaluate_handle(
    '(element, selector) => element.querySelector(selector)',
    selector,
  )
  element = handle.as_element

  if element
    return element
  end
  handle.dispose
  nil
end

#screenshot(options = {}) ⇒ Object 



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# File 'lib/puppeteer/element_handle.rb', line 268

def screenshot(options = {})
  needs_viewport_reset = false

  box = bounding_box
  unless box
    raise ElementNotVisibleError.new
  end

  viewport = @page.viewport
  if viewport && (box.width > viewport.width || box.height > viewport.height)
    new_viewport = viewport.merge(
      width: [viewport.width, box.width.to_i].min,
      height: [viewport.height, box.height.to_i].min,
    )
    @page.viewport = new_viewport

    needs_viewport_reset = true
  end
  scroll_into_view_if_needed

  box = bounding_box
  unless box
    raise ElementNotVisibleError.new
  end
  if box.width == 0
    raise 'Node has 0 width.'
  end
  if box.height == 0
    raise 'Node has 0 height.'
  end

  layout_metrics = @client.send_message('Page.getLayoutMetrics')
  page_x = layout_metrics["layoutViewport"]["pageX"]
  page_y = layout_metrics["layoutViewport"]["pageY"]

  clip = {
    x: page_x + box.x,
    y: page_y + box.y,
    width: box.width,
    height: box.height,
  }

  @page.screenshot({ clip: clip }.merge(options))
ensure
  if needs_viewport_reset
    @page.viewport = viewport
  end
end

#scroll_into_view_if_needed ⇒ Object 



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# File 'lib/puppeteer/element_handle.rb', line 38

def scroll_into_view_if_needed
  js = <<~JAVASCRIPT
    async(element, pageJavascriptEnabled) => {
      if (!element.isConnected)
        return 'Node is detached from document';
      if (element.nodeType !== Node.ELEMENT_NODE)
        return 'Node is not of type HTMLElement';

      if (element.scrollIntoViewIfNeeded) {
        element.scrollIntoViewIfNeeded({block: 'center', inline: 'center', behavior: 'instant'});
      } else {
        // force-scroll if page's javascript is disabled.
        if (!pageJavascriptEnabled) {
          element.scrollIntoView({block: 'center', inline: 'center', behavior: 'instant'});
          return false;
        }
        const visibleRatio = await new Promise(resolve => {
          const observer = new IntersectionObserver(entries => {
            resolve(entries[0].intersectionRatio);
            observer.disconnect();
          });
          observer.observe(element);
        });
        if (visibleRatio !== 1.0)
          element.scrollIntoView({block: 'center', inline: 'center', behavior: 'instant'});
      }
      return false;
    }
  JAVASCRIPT
  error = evaluate(js, @page.javascript_enabled) # returns String or false
  if error
    raise ScrollIntoViewError.new(error)
  end
  # clickpoint is often calculated before scrolling is completed.
  # So, just sleep about 10 frames
  sleep 0.16
end

#select(*values) ⇒ Array<String>

Returns:

  • (Array<String>) 


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# File 'lib/puppeteer/element_handle.rb', line 151

def select(*values)
  if nonstring = values.find { |value| !value.is_a?(String) }
    raise ArgumentError.new("Values must be strings. Found value \"#{nonstring}\" of type \"#{nonstring.class}\"")
  end

  fn = <<~JAVASCRIPT
  (element, values) => {
    if (element.nodeName.toLowerCase() !== 'select') {
      throw new Error('Element is not a <select> element.');
    }

    const options = Array.from(element.options);
    element.value = undefined;
    for (const option of options) {
      option.selected = values.includes(option.value);
      if (option.selected && !element.multiple) {
        break;
      }
    }
    element.dispatchEvent(new Event('input', { bubbles: true }));
    element.dispatchEvent(new Event('change', { bubbles: true }));
    return options.filter(option => option.selected).map(option => option.value);
  }
  JAVASCRIPT
  evaluate(fn, values)
end

#Seval(selector, page_function, *args) ⇒ Object

‘$eval()` in JavaScript. $ is not allowed to use as a method name in Ruby.

Parameters:

  • selector (String)
  • page_function (String)

Returns:

  • (Object) 


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# File 'lib/puppeteer/element_handle.rb', line 355

def Seval(selector, page_function, *args)
  element_handle = S(selector)
  unless element_handle
    raise ElementNotFoundError.new(selector)
  end
  result = element_handle.evaluate(page_function, *args)
  element_handle.dispose

  result
end

#SS(selector) ⇒ Object

‘$$()` in JavaScript. $ is not allowed to use as a method name in Ruby.

Parameters:

  • selector (String) 


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# File 'lib/puppeteer/element_handle.rb', line 335

def SS(selector)
  handles = evaluate_handle(
    '(element, selector) => element.querySelectorAll(selector)',
    selector,
  )
  properties = handles.properties
  handles.dispose
  properties.values.map(&:as_element).compact
end

#SSeval(selector, page_function, *args) ⇒ Object

‘$$eval()` in JavaScript. $ is not allowed to use as a method name in Ruby.

Parameters:

  • selector (String)
  • page_function (String)

Returns:

  • (Object) 


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# File 'lib/puppeteer/element_handle.rb', line 372

def SSeval(selector, page_function, *args)
  handles = evaluate_handle(
    '(element, selector) => Array.from(element.querySelectorAll(selector))',
    selector,
  )
  result = handles.evaluate(page_function, *args)
  handles.dispose

  result
end

#Sx(expression) ⇒ Array<ElementHandle>

‘$x()` in JavaScript. $ is not allowed to use as a method name in Ruby.

Parameters:

  • expression (String)

Returns:



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# File 'lib/puppeteer/element_handle.rb', line 388

def Sx(expression)
  fn = <<~JAVASCRIPT
  (element, expression) => {
    const document = element.ownerDocument || element;
    const iterator = document.evaluate(expression, element, null, XPathResult.ORDERED_NODE_ITERATOR_TYPE);
    const array = [];
    let item;
    while ((item = iterator.iterateNext()))
      array.push(item);
    return array;
  }
  JAVASCRIPT
  handles = evaluate_handle(fn, expression)
  properties = handles.properties
  handles.dispose
  properties.values.map(&:as_element).compact
end

#tap(&block) ⇒ Object 



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# File 'lib/puppeteer/element_handle.rb', line 210

def tap(&block)
  return super(&block) if block

  scroll_into_view_if_needed
  point = clickable_point
  @page.touchscreen.tap(point.x, point.y)
end

#type_text(text, delay: nil) ⇒ Object

Parameters:

  • text (String)
  • delay (number|nil) (defaults to: nil) 


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# File 'lib/puppeteer/element_handle.rb', line 228

def type_text(text, delay: nil)
  focus
  @page.keyboard.type_text(text, delay: delay)
end

#upload_file(*file_paths) ⇒ Object

Parameters:

  • file_paths (Array<String>) 


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# File 'lib/puppeteer/element_handle.rb', line 179

def upload_file(*file_paths)
  is_multiple = evaluate("el => el.multiple")
  if !is_multiple && file_paths.length >= 2
    raise ArgumentError.new('Multiple file uploads only work with <input type=file multiple>')
  end

  if error_path = file_paths.find { |file_path| !File.exist?(file_path) }
    raise ArgmentError.new("#{error_path} does not exist or is not readable")
  end

  backend_node_id = @remote_object.node_info(@client)["node"]["backendNodeId"]

  # The zero-length array is a special case, it seems that DOM.setFileInputFiles does
  # not actually update the files in that case, so the solution is to eval the element
  # value to a new FileList directly.
  if file_paths.empty?
    fn = <<~JAVASCRIPT
    (element) => {
      element.files = new DataTransfer().files;

      // Dispatch events for this case because it should behave akin to a user action.
      element.dispatchEvent(new Event('input', { bubbles: true }));
      element.dispatchEvent(new Event('change', { bubbles: true }));
    }
    JAVASCRIPT
    await this.evaluate(fn)
  else
    @remote_object.set_file_input_files(@client, file_paths, backend_node_id)
  end
end