feat(Input): Add keyboard methods to elementHandle (#801)

This patch:
- adds input methods to ElementHandle, such as ElementHandle.type and ElementHandle.press
- changes `page.type` to accept selector as the first argument
- removes `page.press` method. The `page.press` is rarely used and doesn't operate with selectors; if there's a need to press a button, `page.keyboard.press` should be used.

BREAKING CHANGE: `page.type` is changed, `page.press` is removed.

Fixes #241.

docs/api.md

@@ -59,7 +59,6 @@
     + [page.mouse](#pagemouse)
     + [page.pdf(options)](#pagepdfoptions)
     + [page.plainText()](#pageplaintext)
-    + [page.press(key[, options])](#pagepresskey-options)
     + [page.reload(options)](#pagereloadoptions)
     + [page.screenshot([options])](#pagescreenshotoptions)
     + [page.select(selector, ...values)](#pageselectselector-values)
@@ -74,7 +73,7 @@
     + [page.title()](#pagetitle)
     + [page.touchscreen](#pagetouchscreen)
     + [page.tracing](#pagetracing)
-    + [page.type(text, options)](#pagetypetext-options)
+    + [page.type(selector, text[, options])](#pagetypeselector-text-options)
     + [page.url()](#pageurl)
     + [page.viewport()](#pageviewport)
     + [page.waitFor(selectorOrFunctionOrTimeout[, options[, ...args]])](#pagewaitforselectororfunctionortimeout-options-args)
@@ -83,7 +82,9 @@
     + [page.waitForSelector(selector[, options])](#pagewaitforselectorselector-options)
   * [class: Keyboard](#class-keyboard)
     + [keyboard.down(key[, options])](#keyboarddownkey-options)
+    + [keyboard.press(key[, options])](#keyboardpresskey-options)
     + [keyboard.sendCharacter(char)](#keyboardsendcharacterchar)
+    + [keyboard.type(text, options)](#keyboardtypetext-options)
     + [keyboard.up(key)](#keyboardupkey)
   * [class: Mouse](#class-mouse)
     + [mouse.click(x, y, [options])](#mouseclickx-y-options)
@@ -139,12 +140,15 @@
     + [elementHandle.click([options])](#elementhandleclickoptions)
     + [elementHandle.dispose()](#elementhandledispose)
     + [elementHandle.executionContext()](#elementhandleexecutioncontext)
+    + [elementHandle.focus()](#elementhandlefocus)
     + [elementHandle.getProperties()](#elementhandlegetproperties)
     + [elementHandle.getProperty(propertyName)](#elementhandlegetpropertypropertyname)
     + [elementHandle.hover()](#elementhandlehover)
     + [elementHandle.jsonValue()](#elementhandlejsonvalue)
+    + [elementHandle.press(key[, options])](#elementhandlepresskey-options)
     + [elementHandle.tap()](#elementhandletap)
     + [elementHandle.toString()](#elementhandletostring)
+    + [elementHandle.type(text[, options])](#elementhandletypetext-options)
     + [elementHandle.uploadFile(...filePaths)](#elementhandleuploadfilefilepaths)
   * [class: Request](#class-request)
     + [request.abort()](#requestabort)
@@ -759,15 +763,6 @@ The `format` options are:
 #### page.plainText()
 - returns:  <[Promise]<[string]>> Returns page's inner text.
 
-#### page.press(key[, options])
-- `key` <[string]> Name of key to press, such as `ArrowLeft`. See [KeyboardEvent.key](https://www.w3.org/TR/uievents-key/)
-- `options` <[Object]>
-  - `text` <[string]> If specified, generates an input event with this text.
-  - `delay` <[number]> Time to wait between `keydown` and `keyup` in milliseconds. Defaults to 0.
-- returns: <[Promise]>
-
-Shortcut for [`keyboard.down`](#keyboarddownkey-options) and [`keyboard.up`](#keyboardupkey).
-
 #### page.reload(options)
 - `options` <[Object]> Navigation parameters which might have the following properties:
   - `timeout` <[number]> Maximum navigation time in milliseconds, defaults to 30 seconds, pass `0` to disable timeout.
@@ -896,7 +891,8 @@ Shortcut for [page.mainFrame().title()](#frametitle).
 #### page.tracing
 - returns: <[Tracing]>
 
-#### page.type(text, options)
+#### page.type(selector, text[, options])
+- `selector` <[string]> A [selector] of an element to type into. If there are multiple elements satisfying the selector, the first will be used.
 - `text` <[string]> A text to type into a focused element.
 - `options` <[Object]>
   - `delay` <[number]> Time to wait between key presses in milliseconds. Defaults to 0.
@@ -904,11 +900,11 @@ Shortcut for [page.mainFrame().title()](#frametitle).
 
 Sends a `keydown`, `keypress`/`input`, and `keyup` event for each character in the text.
 
-To press a special key, use [`page.press`](#pagepresskey-options).
+To press a special key, like `Control` or `ArrowDown`, use [`keyboard.press`](#pagekeyboardpresskey-options).
 
 ```js
-page.type('Hello'); // Types instantly
+page.type('#mytextarea', 'Hello'); // Types instantly
-page.type('World', {delay: 100}); // Types slower, like a user
+page.type('#mytextarea', 'World', {delay: 100}); // Types slower, like a user
 ```
 
 #### page.url()
@@ -1003,21 +999,21 @@ Shortcut for [page.mainFrame().waitForSelector(selector[, options])](#framewaitf
 
 ### class: Keyboard
 
-Keyboard provides an api for managing a virtual keyboard. The high level api is [`page.type`](#pagetypetext-options), which takes raw characters and generates proper keydown, keypress/input, and keyup events on your page.
+Keyboard provides an api for managing a virtual keyboard. The high level api is [`keyboard.type`](#keyboardtypetext-options), which takes raw characters and generates proper keydown, keypress/input, and keyup events on your page.
 
 For finer control, you can use [`keyboard.down`](#keyboarddownkey-options), [`keyboard.up`](#keyboardupkey), and [`keyboard.sendCharacter`](#keyboardsendcharacterchar) to manually fire events as if they were generated from a real keyboard.
 
 An example of holding down `Shift` in order to select and delete some text:
 ```js
-page.type('Hello World!');
+page.keyboard.type('Hello World!');
-page.press('ArrowLeft');
+page.keyboard.press('ArrowLeft');
 
 page.keyboard.down('Shift');
 for (let i = 0; i < ' World'.length; i++)
-  page.press('ArrowLeft');
+  page.keyboard.press('ArrowLeft');
 page.keyboard.up('Shift');
 
-page.press('Backspace');
+page.keyboard.press('Backspace');
 // Result text will end up saying 'Hello!'
 ```
 
@@ -1035,6 +1031,15 @@ If `key` is a modifier key, `Shift`, `Meta`, `Control`, or `Alt`, subsequent key
 
 After the key is pressed once, subsequent calls to [`keyboard.down`](#keyboarddownkey-options) will have [repeat](https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/repeat) set to true. To release the key, use [`keyboard.up`](#keyboardupkey).
 
+#### keyboard.press(key[, options])
+- `key` <[string]> Name of key to press, such as `ArrowLeft`. See [KeyboardEvent.key](https://www.w3.org/TR/uievents-key/)
+- `options` <[Object]>
+  - `text` <[string]> If specified, generates an input event with this text.
+  - `delay` <[number]> Time to wait between `keydown` and `keyup` in milliseconds. Defaults to 0.
+- returns: <[Promise]>
+
+Shortcut for [`keyboard.down`](#keyboarddownkey-options) and [`keyboard.up`](#keyboardupkey).
+
 #### keyboard.sendCharacter(char)
 - `char` <[string]> Character to send into the page.
 - returns: <[Promise]>
@@ -1045,6 +1050,21 @@ Dispatches a `keypress` and `input` event. This does not send a `keydown` or `ke
 page.keyboard.sendCharacter('嗨');
 ```
 
+#### keyboard.type(text, options)
+- `text` <[string]> A text to type into a focused element.
+- `options` <[Object]>
+  - `delay` <[number]> Time to wait between key presses in milliseconds. Defaults to 0.
+- returns: <[Promise]>
+
+Sends a `keydown`, `keypress`/`input`, and `keyup` event for each character in the text.
+
+To press a special key, like `Control` or `ArrowDown`, use [`keyboard.press`](#keyboardpresskey-options).
+
+```js
+page.keyboard.type('Hello'); // Types instantly
+page.keyboard.type('World', {delay: 100}); // Types slower, like a user
+```
+
 #### keyboard.up(key)
 - `key` <[string]> Name of key to release, such as `ArrowLeft`. See [KeyboardEvent.key](https://www.w3.org/TR/uievents-key/)
 - returns: <[Promise]>
@@ -1396,7 +1416,7 @@ const twoHandle = await executionContext.evaluateHandle(() => 2);
 const result = await executionContext.evaluate((a, b) => a + b, oneHandle, twoHandle);
 await oneHandle.dispose();
 await twoHandle.dispose();
-console.log(result); // prints '3'. 
+console.log(result); // prints '3'.
 ```
 
 #### executionContext.evaluateHandle(pageFunction, ...args)
@@ -1527,6 +1547,11 @@ The `elementHandle.dispose` method stops referencing the element handle.
 #### elementHandle.executionContext()
 - returns: [ExecutionContext]
 
+#### elementHandle.focus()
+- returns: <[Promise]>
+
+Calls [focus](https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/focus) on the element.
+
 #### elementHandle.getProperties()
 - returns: <[Promise]<[Map]<[string], [JSHandle]>>>
 
@@ -1563,6 +1588,15 @@ Returns a JSON representation of the object. The JSON is generated by running [`
 
 > **NOTE** The method will throw if the referenced object is not stringifiable.
 
+#### elementHandle.press(key[, options])
+- `key` <[string]> Name of key to press, such as `ArrowLeft`. See [KeyboardEvent.key](https://www.w3.org/TR/uievents-key/)
+- `options` <[Object]>
+  - `text` <[string]> If specified, generates an input event with this text.
+  - `delay` <[number]> Time to wait between `keydown` and `keyup` in milliseconds. Defaults to 0.
+- returns: <[Promise]>
+
+Focuses the element, and then uses [`keyboard.down`](#keyboarddownkey-options) and [`keyboard.up`](#keyboardupkey).
+
 #### elementHandle.tap()
 - returns: <[Promise]> Promise which resolves when the element is successfully tapped. Promise gets rejected if the element is detached from DOM.
 
@@ -1572,6 +1606,21 @@ If the element is detached from DOM, the method throws an error.
 #### elementHandle.toString()
 - returns: <[string]>
 
+#### elementHandle.type(text[, options])
+- `text` <[string]> A text to type into a focused element.
+- `options` <[Object]>
+  - `delay` <[number]> Time to wait between key presses in milliseconds. Defaults to 0.
+- returns: <[Promise]>
+
+Focuses the element, and then sends a `keydown`, `keypress`/`input`, and `keyup` event for each character in the text.
+
+To press a special key, like `Control` or `ArrowDown`, use [`elementHandle.press`](#elementhandlepresskey-options).
+
+```js
+elementHandle.type('Hello'); // Types instantly
+elementHandle.type('World', {delay: 100}); // Types slower, like a user
+```
+
 #### elementHandle.uploadFile(...filePaths)
 - `...filePaths` <...[string]> Sets the value of the file input these paths. If some of the  `filePaths` are relative paths, then they are resolved relative to [current working directory](https://nodejs.org/api/process.html#process_process_cwd).
 - returns: <[Promise]>

lib/ElementHandle.js

@@ -22,13 +22,14 @@ class ElementHandle extends JSHandle {
    * @param {!ExecutionContext} context
    * @param {!Session} client
    * @param {!Object} remoteObject
-   * @param {!Mouse} mouse
+   * @param {!Page} page
-   * @param {!Touchscreen} touchscreen;
    */
-  constructor(context, client, remoteObject, mouse, touchscreen) {
+  constructor(context, client, remoteObject, page) {
     super(context, client, remoteObject);
-    this._mouse = mouse;
+    this._client = client;
-    this._touchscreen = touchscreen;
+    this._remoteObject = remoteObject;
+    this._page = page;
+    this._disposed = false;
   }
 
   /**
@@ -63,7 +64,7 @@ class ElementHandle extends JSHandle {
 
   async hover() {
     const {x, y} = await this._visibleCenter();
-    await this._mouse.move(x, y);
+    await this._page.mouse.move(x, y);
   }
 
   /**
@@ -71,7 +72,7 @@ class ElementHandle extends JSHandle {
    */
   async click(options) {
     const {x, y} = await this._visibleCenter();
-    await this._mouse.click(x, y, options);
+    await this._page.mouse.click(x, y, options);
   }
 
   /**
@@ -86,7 +87,29 @@ class ElementHandle extends JSHandle {
 
   async tap() {
     const {x, y} = await this._visibleCenter();
-    await this._touchscreen.tap(x, y);
+    await this._page.touchscreen.tap(x, y);
+  }
+
+  async focus() {
+    await this.executionContext().evaluate(element => element.focus(), this);
+  }
+
+  /**
+   * @param {string} text
+   * @param {{delay: (number|undefined)}=} options
+   */
+  async type(text, options) {
+    await this.focus();
+    await this._page.keyboard.type(text, options);
+  }
+
+  /**
+   * @param {string} key
+   * @param {!Object=} options
+   */
+  async press(key, options) {
+    await this.focus();
+    await this._page.keyboard.press(key, options);
   }
 }
 

lib/FrameManager.js

@@ -23,15 +23,12 @@ const ElementHandle = require('./ElementHandle');
 class FrameManager extends EventEmitter {
   /**
    * @param {!Session} client
-   * @param {!Object} frameTree
+   * @param {!Page} page
-   * @param {!Mouse} mouse
-   * @param {!Touchscreen} touchscreen
    */
-  constructor(client, mouse, touchscreen) {
+  constructor(client, page) {
     super();
     this._client = client;
-    this._mouse = mouse;
+    this._page = page;
-    this._touchscreen = touchscreen;
     /** @type {!Map<string, !Frame>} */
     this._frames = new Map();
     /** @type {!Map<string, !ExecutionContext>} */
@@ -67,7 +64,7 @@ class FrameManager extends EventEmitter {
       return;
     console.assert(parentFrameId);
     const parentFrame = this._frames.get(parentFrameId);
-    const frame = new Frame(this._client, this._mouse, this._touchscreen, parentFrame, frameId);
+    const frame = new Frame(this._client, this._page, parentFrame, frameId);
     this._frames.set(frame._id, frame);
     this.emit(FrameManager.Events.FrameAttached, frame);
   }
@@ -94,7 +91,7 @@ class FrameManager extends EventEmitter {
         frame._id = framePayload.id;
       } else {
         // Initial main frame navigation.
-        frame = new Frame(this._client, this._mouse, this._touchscreen, null, framePayload.id);
+        frame = new Frame(this._client, this._page, null, framePayload.id);
       }
       this._frames.set(framePayload.id, frame);
       this._mainFrame = frame;
@@ -141,7 +138,7 @@ class FrameManager extends EventEmitter {
     const context = this._contextIdToContext.get(contextId);
     console.assert(context, 'INTERNAL ERROR: missing context with id = ' + contextId);
     if (remoteObject.subtype === 'node')
-      return new ElementHandle(context, this._client, remoteObject, this._mouse, this._touchscreen);
+      return new ElementHandle(context, this._client, remoteObject, this._page);
     return new JSHandle(context, this._client, remoteObject);
   }
 
@@ -178,15 +175,12 @@ FrameManager.Events = {
 class Frame {
   /**
    * @param {!Session} client
-   * @param {!Mouse} mouse
-   * @param {!Touchscreen} touchscreen
    * @param {?Frame} parentFrame
    * @param {string} frameId
    */
-  constructor(client, mouse, touchscreen, parentFrame, frameId) {
+  constructor(client, page, parentFrame, frameId) {
     this._client = client;
-    this._mouse = mouse;
+    this._page = page;
-    this._touchscreen = touchscreen;
     this._parentFrame = parentFrame;
     this._url = '';
     this._id = frameId;

lib/Input.js

@@ -88,6 +88,32 @@ class Keyboard {
       unmodifiedText: char
     });
   }
+
+  /**
+   * @param {string} text
+   * @param {{delay: (number|undefined)}=} options
+   */
+  async type(text, options) {
+    let delay = 0;
+    if (options && options.delay)
+      delay = options.delay;
+    for (const char of text) {
+      await this.press(char, {text: char, delay});
+      if (delay)
+        await new Promise(f => setTimeout(f, delay));
+    }
+  }
+
+  /**
+   * @param {string} key
+   * @param {!Object=} options
+   */
+  async press(key, options) {
+    await this.down(key, options);
+    if (options && options.delay)
+      await new Promise(f => setTimeout(f, options.delay));
+    await this.up(key);
+  }
 }
 
 class Mouse {

lib/Page.js

@@ -63,7 +63,7 @@ class Page extends EventEmitter {
     this._keyboard = new Keyboard(client);
     this._mouse = new Mouse(client, this._keyboard);
     this._touchscreen = new Touchscreen(client, this._keyboard);
-    this._frameManager = new FrameManager(client, this._mouse, this._touchscreen);
+    this._frameManager = new FrameManager(client, this);
     this._networkManager = new NetworkManager(client);
     this._emulationManager = new EmulationManager(client);
     this._tracing = new Tracing(client);
@@ -711,7 +711,7 @@ class Page extends EventEmitter {
   async focus(selector) {
     const handle = await this.$(selector);
     console.assert(handle, 'No node found for selector: ' + selector);
-    await this.evaluate(element => element.focus(), handle);
+    await handle.focus();
     await handle.dispose();
   }
 
@@ -739,31 +739,14 @@ class Page extends EventEmitter {
   }
 
   /**
+   * @param {string} selector
    * @param {string} text
    * @param {{delay: (number|undefined)}=} options
    */
-  async type(text, options) {
+  async type(selector, text, options) {
-    let delay = 0;
+    const handle = await this.$(selector);
-    if (options && options.delay)
+    await handle.type(text, options);
-      delay = options.delay;
+    await handle.dispose();
-    let last;
-    for (const char of text) {
-      last = this.press(char, {text: char, delay});
-      if (delay)
-        await new Promise(f => setTimeout(f, delay));
-    }
-    await last;
-  }
-
-  /**
-   * @param {string} text
-   * @param {!Object=} options
-   */
-  async press(key, options) {
-    this._keyboard.down(key, options);
-    if (options && options.delay)
-      await new Promise(f => setTimeout(f, options.delay));
-    await this._keyboard.up(key);
   }
 
   /**

test/test.js

@@ -1426,8 +1426,9 @@ describe('Page', function() {
     }));
     it('should type into the textarea', SX(async function() {
       await page.goto(PREFIX + '/input/textarea.html');
-      await page.focus('textarea');
+
-      await page.type('Type in this text!');
+      const textarea = await page.$('textarea');
+      await textarea.type('Type in this text!');
       expect(await page.evaluate(() => result)).toBe('Type in this text!');
     }));
     it('should click the button after navigation ', SX(async function() {
@@ -1452,29 +1453,28 @@ describe('Page', function() {
     }));
     it('should move with the arrow keys', SX(async function(){
       await page.goto(PREFIX + '/input/textarea.html');
-      await page.focus('textarea');
+      await page.type('textarea', 'Hello World!');
-      await page.type('Hello World!');
       expect(await page.evaluate(() => document.querySelector('textarea').value)).toBe('Hello World!');
       for (let i = 0; i < 'World!'.length; i++)
-        page.press('ArrowLeft');
+        page.keyboard.press('ArrowLeft');
-      await page.type('inserted ');
+      await page.keyboard.type('inserted ');
       expect(await page.evaluate(() => document.querySelector('textarea').value)).toBe('Hello inserted World!');
       page.keyboard.down('Shift');
       for (let i = 0; i < 'inserted '.length; i++)
-        page.press('ArrowLeft');
+        page.keyboard.press('ArrowLeft');
       page.keyboard.up('Shift');
-      await page.press('Backspace');
+      await page.keyboard.press('Backspace');
       expect(await page.evaluate(() => document.querySelector('textarea').value)).toBe('Hello World!');
     }));
-    it('should send a character with Page.press', SX(async function() {
+    it('should send a character with ElementHandle.press', SX(async function() {
       await page.goto(PREFIX + '/input/textarea.html');
-      await page.focus('textarea');
+      const textarea = await page.$('textarea');
-      await page.press('a', {text: 'f'});
+      await textarea.press('a', {text: 'f'});
       expect(await page.evaluate(() => document.querySelector('textarea').value)).toBe('f');
 
       await page.evaluate(() => window.addEventListener('keydown', e => e.preventDefault(), true));
 
-      await page.press('a', {text: 'y'});
+      await textarea.press('a', {text: 'y'});
       expect(await page.evaluate(() => document.querySelector('textarea').value)).toBe('f');
     }));
     it('should send a character with sendCharacter', SX(async function() {
@@ -1519,12 +1519,12 @@ describe('Page', function() {
     }));
     it('should send proper codes while typing', SX(async function(){
       await page.goto(PREFIX + '/input/keyboard.html');
-      await page.type('!');
+      await page.keyboard.type('!');
       expect(await page.evaluate(() => getResult())).toBe(
           [ 'Keydown: ! 49 []',
             'Keypress: ! 33 33 33 []',
             'Keyup: ! 49 []'].join('\n'));
-      await page.type('^');
+      await page.keyboard.type('^');
       expect(await page.evaluate(() => getResult())).toBe(
           [ 'Keydown: ^ 54 []',
             'Keypress: ^ 94 94 94 []',
@@ -1534,7 +1534,7 @@ describe('Page', function() {
       await page.goto(PREFIX + '/input/keyboard.html');
       const keyboard = page.keyboard;
       await keyboard.down('Shift');
-      await page.type('~');
+      await page.keyboard.type('~');
       expect(await page.evaluate(() => getResult())).toBe(
           [ 'Keydown: Shift 16 [Shift]',
             'Keydown: ~ 192 [Shift]', // 192 is ` keyCode
@@ -1555,7 +1555,7 @@ describe('Page', function() {
             Promise.resolve().then(() => event.preventDefault());
         }, false);
       });
-      await page.type('Hello World!');
+      await page.keyboard.type('Hello World!');
       expect(await page.evaluate(() => textarea.value)).toBe('He Wrd!');
     }));
     it('keyboard.modifiers()', SX(async function(){
@@ -1603,7 +1603,7 @@ describe('Page', function() {
       await page.goto(PREFIX + '/input/textarea.html');
       await page.focus('textarea');
       const text = 'This is the text that we are going to try to select. Let\'s see how it goes.';
-      await page.type(text);
+      await page.keyboard.type(text);
       await page.evaluate(() => document.querySelector('textarea').scrollTop = 0);
       const {x, y} = await page.evaluate(dimensions);
       await page.mouse.move(x + 2,y + 2);
@@ -1616,7 +1616,7 @@ describe('Page', function() {
       await page.goto(PREFIX + '/input/textarea.html');
       await page.focus('textarea');
       const text = 'This is the text that we are going to try to select. Let\'s see how it goes.';
-      await page.type(text);
+      await page.keyboard.type(text);
       await page.click('textarea');
       await page.click('textarea', {clickCount: 2});
       await page.click('textarea', {clickCount: 3});
@@ -1659,7 +1659,7 @@ describe('Page', function() {
       await page.evaluate(() => document.querySelector('textarea').addEventListener('keydown', e => window.lastEvent = e, true));
       await page.keyboard.down('a', {text: 'a'});
       expect(await page.evaluate(() => window.lastEvent.repeat)).toBe(false);
-      await page.press('a');
+      await page.keyboard.press('a');
       expect(await page.evaluate(() => window.lastEvent.repeat)).toBe(true);
     }));
     // @see https://github.com/GoogleChrome/puppeteer/issues/206