githubmirror/materialize

js/forms.js
235 строк8 KB
Chang Alan
added native element support for textareaAutoResize
30 дек 2017, 06:24
30 дек 2017, 06:24f76204b
(function ($) {
  // Function to update labels of text fields
  M.updateTextFields = function() {
    let input_selector = 'input[type=text], input[type=password], input[type=email], input[type=url], input[type=tel], input[type=number], input[type=search], textarea';
    $(input_selector).each(function(element, index) {
      let $this = $(this);
      if (element.value.length > 0 || $(element).is(':focus') || element.autofocus || $this.attr('placeholder') !== null) {
        $this.siblings('label').addClass('active');
      } else if (element.validity) {
        $this.siblings('label').toggleClass('active', element.validity.badInput === true);
      } else {
        $this.siblings('label').removeClass('active');
      }
    });
  };

  M.validate_field = function(object) {
    let hasLength = object.attr('data-length') !== null;
    let lenAttr = parseInt(object.attr('data-length'));
    let len = object[0].value.length;

    if (len === 0 && object[0].validity.badInput === false && !object.is(':required')) {
      if (object.hasClass('validate')) {
        object.removeClass('valid');
        object.removeClass('invalid');
      }

    } else {
      if (object.hasClass('validate')) {
        // Check for character counter attributes
        if ((object.is(':valid') && hasLength && (len <= lenAttr)) || (object.is(':valid') && !hasLength)) {
          object.removeClass('invalid');
          object.addClass('valid');
        }
        else {
          object.removeClass('valid');
          object.addClass('invalid');
        }
      }
    }
  };


  M.textareaAutoResize = function($textarea) {
    // Wrap if native element
    if ($textarea instanceof Element) {
      $textarea = $($textarea);
    }

    // Textarea Auto Resize
    let hiddenDiv = $('.hiddendiv').first();
    if (!hiddenDiv.length) {
      hiddenDiv = $('<div class="hiddendiv common"></div>');
      $('body').append(hiddenDiv);
    }

    // Set font properties of hiddenDiv
    let fontFamily = $textarea.css('font-family');
    let fontSize = $textarea.css('font-size');
    let lineHeight = $textarea.css('line-height');

    // Firefox can't handle padding shorthand.
    let paddingTop = $textarea.css('padding-top');
    let paddingRight = $textarea.css('padding-right');
    let paddingBottom = $textarea.css('padding-bottom');
    let paddingLeft = $textarea.css('padding-left');

    if (fontSize) { hiddenDiv.css('font-size', fontSize); }
    if (fontFamily) { hiddenDiv.css('font-family', fontFamily); }
    if (lineHeight) { hiddenDiv.css('line-height', lineHeight); }
    if (paddingTop) { hiddenDiv.css('padding-top', paddingTop); }
    if (paddingRight) { hiddenDiv.css('padding-right', paddingRight); }
    if (paddingBottom) { hiddenDiv.css('padding-bottom', paddingBottom); }
    if (paddingLeft) { hiddenDiv.css('padding-left', paddingLeft); }

    // Set original-height, if none
    if (!$textarea.data('original-height')) {
      $textarea.data('original-height', $textarea.height());
    }

    if ($textarea.attr('wrap') === 'off') {
      hiddenDiv.css('overflow-wrap', 'normal')
        .css('white-space', 'pre');
    }

    hiddenDiv.text($textarea[0].value + '\n');
    let content = hiddenDiv.html().replace(/\n/g, '<br>');
    hiddenDiv.html(content);


    // When textarea is hidden, width goes crazy.
    // Approximate with half of window size

    if ($textarea.css('display') !== 'hidden') {
      hiddenDiv.css('width', $textarea.width() + 'px');
    }
    else {
      hiddenDiv.css('width', ($(window).width()/2) + 'px');
    }


    /**
     * Resize if the new height is greater than the
     * original height of the textarea
     */
    if ($textarea.data('original-height') <= hiddenDiv.innerHeight()) {
      $textarea.css('height', hiddenDiv.innerHeight() + 'px');
    } else if ($textarea[0].value.length < $textarea.data('previous-length')) {
      /**
       * In case the new height is less than original height, it
       * means the textarea has less text than before
       * So we set the height to the original one
       */
      $textarea.css('height', $textarea.data('original-height') + 'px');
    }
    $textarea.data('previous-length', $textarea[0].value.length);
  };


  $(document).ready(function() {
    // Text based inputs
    let input_selector = 'input[type=text], input[type=password], input[type=email], input[type=url], input[type=tel], input[type=number], input[type=search], textarea';

    // Add active if form auto complete
    $(document).on('change', input_selector, function () {
      if(this.value.length !== 0 || $(this).attr('placeholder') !== null) {
        $(this).siblings('label').addClass('active');
      }
      M.validate_field($(this));
    });

    // Add active if input element has been pre-populated on document ready
    $(document).ready(function() {
      M.updateTextFields();
    });

    // HTML DOM FORM RESET handling
    $(document).on('reset', function(e) {
      let formReset = $(e.target);
      if (formReset.is('form')) {
        formReset.find(input_selector).removeClass('valid').removeClass('invalid');
        formReset.find(input_selector).each(function (e) {
          if (this.value.length) {
            $(this).siblings('label').removeClass('active');
          }
        });

        // Reset select (after native reset)
        setTimeout(function() {
          formReset.find('select').each(function () {
            // check if initialized
            if (this.M_Select) {
              let reset_text = $(this).find('option[selected]').text();
              $(this).siblings('input.select-dropdown')[0].value = reset_text;
            }
          });
        }, 0);
      }
    });

    /**
     * Add active when element has focus
     * @param {Event} e
     */
    document.addEventListener('focus', function(e) {
      if ($(e.target).is(input_selector)) {
        $(e.target).siblings('label, .prefix').addClass('active');
      }
    }, true);

    /**
     * Remove active when element is blurred
     * @param {Event} e
     */
    document.addEventListener('blur', function(e) {
      let $inputElement = $(e.target);
      if ($inputElement.is(input_selector)) {
        let selector = ".prefix";

        if ($inputElement[0].value.length === 0 && $inputElement[0].validity.badInput !== true && $inputElement.attr('placeholder') === null) {
          selector += ", label";
        }
        $inputElement.siblings(selector).removeClass('active');
        M.validate_field($inputElement);
      }
    }, true);

    // Radio and Checkbox focus class
    let radio_checkbox = 'input[type=radio], input[type=checkbox]';
    $(document).on('keyup', radio_checkbox, function(e) {
      // TAB, check if tabbing to radio or checkbox.
      if (e.which === M.keys.TAB) {
        $(this).addClass('tabbed');
        let $this = $(this);
        $this.one('blur', function(e) {
          $(this).removeClass('tabbed');
        });
        return;
      }
    });

    let text_area_selector = '.materialize-textarea';
    $(text_area_selector).each(function () {
      let $textarea = $(this);
      /**
       * Resize textarea on document load after storing
       * the original height and the original length
       */
      $textarea.data('original-height', $textarea.height());
      $textarea.data('previous-length', this.value.length);
      M.textareaAutoResize($textarea);
    });

    $(document).on('keyup', text_area_selector, function () {
      M.textareaAutoResize($(this));
    });
    $(document).on('keydown', text_area_selector, function () {
      M.textareaAutoResize($(this));
    });

    // File Input Path
    $(document).on('change', '.file-field input[type="file"]', function () {
      let file_field = $(this).closest('.file-field');
      let path_input = file_field.find('input.file-path');
      let files      = $(this)[0].files;
      let file_names = [];
      for (let i = 0; i < files.length; i++) {
        file_names.push(files[i].name);
      }
      path_input[0].value = file_names.join(", ");
      path_input.trigger('change');
    });

  }); // End of $(document).ready
}( cash ));