selection_test.html - This HTML code is a test suite for a …

/closure/closure-library/closure/goog/dom/selection_test.html

https://code.google.com/p/plovr/ · HTML · 329 lines · 273 code · 50 blank · 6 comment · 0 complexity · 6d38910a8441c5577eaaaa3287def716 MD5 · raw file

<!DOCTYPE html>
<html>
<!--
Copyright 2007 The Closure Library Authors. All Rights Reserved.

Use of this source code is governed by the Apache License, Version 2.0.
See the COPYING file for details.
-->
<head>
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>Closure Unit Tests - goog.dom.selection</title>
<script src="../base.js"></script>
<script>
  goog.require('goog.dom');
  goog.require('goog.dom.selection');
  goog.require('goog.testing.jsunit');
  goog.require('goog.userAgent');
</script>
</head>
<body>

<script>

  var input;
  var hiddenInput;
  var textarea;
  var hiddenTextarea;

  function setUp() {
    input = goog.dom.createDom('input', {type: 'text'});
    textarea = goog.dom.createDom('textarea');
    hiddenInput = goog.dom.createDom(
        'input', {type: 'text', style: 'display: none'});
    hiddenTextarea = goog.dom.createDom(
        'textarea', {style: 'display: none'});

    document.body.appendChild(input);
    document.body.appendChild(textarea);
    document.body.appendChild(hiddenInput);
    document.body.appendChild(hiddenTextarea);
  }

  function tearDown() {
    goog.dom.removeNode(input);
    goog.dom.removeNode(textarea);
    goog.dom.removeNode(hiddenInput);
    goog.dom.removeNode(hiddenTextarea);
  }

  /**
   * Tests getStart routine in both input and textarea.
   */
  function testGetStartInput() {
    getStartHelper(input, hiddenInput);
  }

  function testGetStartTextarea() {
    getStartHelper(textarea, hiddenTextarea);
  }

  function getStartHelper(field, hiddenField) {
    assertEquals(0, goog.dom.selection.getStart(field));
    assertEquals(0, goog.dom.selection.getStart(hiddenField));

    field.focus();
    assertEquals(0, goog.dom.selection.getStart(field));
  }

  /**
   * Tests the setText routine for both input and textarea
   * with a single line of text.
   */
  function testSetTextInput() {
    setTextHelper(input);
  }

  function testSetTextTextarea() {
    setTextHelper(textarea);
  }

  function setTextHelper(field) {
    // Test one line string only
    select(field);
    assertEquals('', goog.dom.selection.getText(field));

    goog.dom.selection.setText(field, 'Get Behind Me Satan');
    assertEquals('Get Behind Me Satan', goog.dom.selection.getText(field));
  }

  /**
   * Tests the setText routine for textarea with multiple lines of text.
   */
  function testSetTextMultipleLines() {
    select(textarea);
    assertEquals('', goog.dom.selection.getText(textarea));
    var message = goog.userAgent.IE ?
                  'Get Behind Me\r\nSatan' :
                  'Get Behind Me\nSatan';
    goog.dom.selection.setText(textarea, message);
    assertEquals(message, goog.dom.selection.getText(textarea));

    // Select the text upto the point just after the \r\n combination
    // or \n in GECKO.
    var endOfNewline = goog.userAgent.IE ? 15 : 14;
    var selectedMessage = message.substring(0, endOfNewline);
    goog.dom.selection.setStart(textarea, 0);
    goog.dom.selection.setEnd(textarea, endOfNewline);
    assertEquals(selectedMessage, goog.dom.selection.getText(textarea));

    selectedMessage = goog.userAgent.IE ? '\r\n' : '\n';
    goog.dom.selection.setStart(textarea, 13);
    goog.dom.selection.setEnd(textarea, endOfNewline);
    assertEquals(selectedMessage, goog.dom.selection.getText(textarea));
  }

  /**
   * Tests the setCursor routine for both input and textarea.
   */
  function testSetCursorInput() {
    setCursorHelper(input);
  }

  function testSetCursorTextarea() {
    setCursorHelper(textarea);
  }

  function setCursorHelper(field) {
    select(field);
    // try to set the cursor beyond the length of the content
    goog.dom.selection.setStart(field, 5);
    goog.dom.selection.setEnd(field, 15);
    assertEquals(0, goog.dom.selection.getStart(field));
    assertEquals(0, goog.dom.selection.getEnd(field));

    select(field);
    var message = 'Get Behind Me Satan';
    goog.dom.selection.setText(field, message);
    goog.dom.selection.setStart(field, 5);
    goog.dom.selection.setEnd(field, message.length);
    assertEquals(5, goog.dom.selection.getStart(field));
    assertEquals(message.length, goog.dom.selection.getEnd(field));

    // Set the end before the start, and see if getEnd returns the start
    // position itself.
    goog.dom.selection.setStart(field, 5);
    goog.dom.selection.setEnd(field, 3);
    assertEquals(3, goog.dom.selection.getEnd(field));
  }

  /**
   * Tests the getText and setText routines acting on selected text in
   * both input and textarea.
   */
  function testGetAndSetSelectedTextInput() {
    getAndSetSelectedTextHelper(input);
  }

  function testGetAndSetSelectedTextTextarea() {
    getAndSetSelectedTextHelper(textarea);
  }

  function getAndSetSelectedTextHelper(field) {
    select(field);
    goog.dom.selection.setText(field, 'Get Behind Me Satan');

    // select 'Behind'
    goog.dom.selection.setStart(field, 4);
    goog.dom.selection.setEnd(field, 10);
    assertEquals('Behind', goog.dom.selection.getText(field));

    goog.dom.selection.setText(field, 'In Front Of');
    goog.dom.selection.setStart(field, 0);
    goog.dom.selection.setEnd(field, 100);
    assertEquals('Get In Front Of Me Satan', goog.dom.selection.getText(field));
  }

  /**
   * Test setStart on hidden input and hidden textarea.
   */
  function testSetCursorOnHiddenInput() {
    setCursorOnHiddenInputHelper(hiddenInput);
  }

  function testSetCursorOnHiddenTextarea() {
    setCursorOnHiddenInputHelper(hiddenTextarea);
  }

  function setCursorOnHiddenInputHelper(hiddenField) {
    goog.dom.selection.setStart(hiddenField, 0);
    assertEquals(0, goog.dom.selection.getStart(hiddenField));
  }

  /**
   * Test setStart, setEnd, getStart and getEnd in textarea with text
   * containing line breaks.
   */
  function testSetAndGetCursorWithLineBreaks() {
    select(textarea);
    var newline = goog.userAgent.IE ? '\r\n' : '\n';
    var message = 'Hello' + newline + 'World';
    goog.dom.selection.setText(textarea, message);

    // Test setEnd and getEnd, by setting the cursor somewhere after the
    // \r\n combination.
    goog.dom.selection.setEnd(textarea, 9);
    assertEquals(9, goog.dom.selection.getEnd(textarea));

    // Test basic setStart and getStart
    goog.dom.selection.setStart(textarea, 10);
    assertEquals(10, goog.dom.selection.getStart(textarea));

    // Test setEnd and getEnd, by setting the cursor exactly after the
    // \r\n combination in IE or after \n in GECKO.
    var endOfNewline = goog.userAgent.IE ? 7 : 6;
    checkSetAndGetTextarea(endOfNewline, endOfNewline);

    // Select a \r\n combination in IE or \n in GECKO and see if
    // getStart and getEnd work correctly.
    clearField(textarea);
    message = 'Hello' + newline + newline + 'World';
    goog.dom.selection.setText(textarea, message);
    var startOfNewline = goog.userAgent.IE ? 7 : 6;
    endOfNewline = goog.userAgent.IE ? 9 : 7;
    checkSetAndGetTextarea(startOfNewline, endOfNewline);

    // Select 2 \r\n combinations in IE or 2 \ns in GECKO and see if getStart
    // and getEnd work correctly.
    checkSetAndGetTextarea(5, endOfNewline);

    // Position cursor b/w 2 \r\n combinations in IE or 2 \ns in GECKO and see
    // if getStart and getEnd work correctly.
    clearField(textarea);
    message = 'Hello' + newline + newline + newline + newline + 'World';
    goog.dom.selection.setText(textarea, message);
    var middleOfNewlines = goog.userAgent.IE ? 9 : 7;
    checkSetAndGetTextarea(middleOfNewlines, middleOfNewlines);

    // Position cursor at end of a textarea which ends with \r\n in IE or \n in
    // GECKO.
    clearField(textarea);
    message = 'Hello' + newline + newline;
    goog.dom.selection.setText(textarea, message);
    var endOfTextarea = message.length;
    checkSetAndGetTextarea(endOfTextarea, endOfTextarea);

    // Position cursor at the end of the 2 starting \r\ns in IE or \ns in GECKO
    // within a textarea.
    clearField(textarea);
    message = newline + newline + 'World';
    goog.dom.selection.setText(textarea, message);
    var endOfTwoNewlines = goog.userAgent.IE ? 4 : 2;
    checkSetAndGetTextarea(endOfTwoNewlines, endOfTwoNewlines);

    // Position cursor at the end of the first \r\n in IE or \n in
    // GECKO within a textarea.
    endOfOneNewline = goog.userAgent.IE ? 2 : 1;
    checkSetAndGetTextarea(endOfOneNewline, endOfOneNewline);
  }

  /**
   * Test to make sure there's no error when getting the range of an unselected
   * textarea. See bug 1274027.
   */
  function testGetStartOnUnfocusedTextarea() {
    input.value = 'White Blood Cells';
    input.focus();
    goog.dom.selection.setCursorPosition(input, 5);

    assertEquals('getStart on input should return where we put the cursor',
        5, goog.dom.selection.getStart(input));

    assertEquals('getStart on unfocused textarea should succeed without error',
        0, goog.dom.selection.getStart(textarea));
  }

  /**
   * Test to make sure there's no error setting cursor position within a
   * textarea after a newline. This is problematic on IE because of the
   * '\r\n' vs '\n' issue.
   */
  function testSetCursorPositionTextareaWithNewlines() {
    textarea.value = 'Hello\nWorld';
    textarea.focus();

    // Set the selection point between 'W' and 'o'. Position is computed this
    // way instead of being hard-coded because it's different in IE due to \r\n
    // vs \n.
    goog.dom.selection.setCursorPosition(textarea, textarea.value.length - 4);

    var linebreak = goog.userAgent.IE ? '\r\n' : '\n';
    var expectedLeftString = 'Hello' + linebreak + 'W';

    assertEquals('getStart on input should return after the newline',
        expectedLeftString.length, goog.dom.selection.getStart(textarea));
    assertEquals('getEnd on input should return after the newline',
        expectedLeftString.length, goog.dom.selection.getEnd(textarea));

    goog.dom.selection.setEnd(textarea, textarea.value.length);
    assertEquals('orld', goog.dom.selection.getText(textarea));
  }

  /**
   * Helper function to clear the textfield contents.
   */
  function clearField(field) {
    field.value = '';
  }

  /**
   * Helper function to set the start and end and assert the getter values.
   */
  function checkSetAndGetTextarea(start, end) {
    goog.dom.selection.setStart(textarea, start);
    goog.dom.selection.setEnd(textarea, end);
    assertEquals(start, goog.dom.selection.getStart(textarea));
    assertEquals(end, goog.dom.selection.getEnd(textarea));
  }

  /**
   * Helper function to focus and select a field. In IE8, selected
   * fields need focus.
   */
  function select(field) {
    field.focus();
    field.select();
  }
</script>
</body>
</html>
Summary ✨

This HTML code is a test suite for a web browser’s text selection functionality, specifically its handling of newline characters and cursor positioning within a textarea element. It tests various scenarios, including setting and getting cursor positions, selecting text, and focusing on fields. The code uses JavaScript to interact with the webpage and verify the expected behavior of the browser’s text selection features.
Alerts (2)

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