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Viewing file:     autosize.js (8.83 KB)      -rw-r--r--

/*
****************************************************************************
* Text Area auto resize
****************************************************************************
*/
(function (global, factory) {
    if (typeof define === "function" && define.amd) {
      define(['module', 'exports'], factory);
    } else if (typeof exports !== "undefined") {
      factory(module, exports);
    } else {
      var mod = {
        exports: {}
      };
      factory(mod, mod.exports);
      global.autosize = mod.exports;
    }
  })(this, function (module, exports) {
    'use strict';
  
    var map = typeof Map === "function" ? new Map() : function () {
      var keys = [];
      var values = [];
  
      return {
        has: function has(key) {
          return keys.indexOf(key) > -1;
        },
        get: function get(key) {
          return values[keys.indexOf(key)];
        },
        set: function set(key, value) {
          if (keys.indexOf(key) === -1) {
            keys.push(key);
            values.push(value);
          }
        },
        delete: function _delete(key) {
          var index = keys.indexOf(key);
          if (index > -1) {
            keys.splice(index, 1);
            values.splice(index, 1);
          }
        }
      };
    }();
  
    var createEvent = function createEvent(name) {
      return new Event(name, { bubbles: true });
    };
    try {
      new Event('test');
    } catch (e) {
      // IE does not support `new Event()`
      createEvent = function createEvent(name) {
        var evt = document.createEvent('Event');
        evt.initEvent(name, true, false);
        return evt;
      };
    }
  
    function assign(ta) {
      if (!ta || !ta.nodeName || ta.nodeName !== 'TEXTAREA' || map.has(ta)) return;
  
      var heightOffset = null;
      var clientWidth = null;
      var cachedHeight = null;
  
      function init() {
        var style = window.getComputedStyle(ta, null);
  
        if (style.resize === 'vertical') {
          ta.style.resize = 'none';
        } else if (style.resize === 'both') {
          ta.style.resize = 'horizontal';
        }
  
        if (style.boxSizing === 'content-box') {
          heightOffset = -(parseFloat(style.paddingTop) + parseFloat(style.paddingBottom));
        } else {
          heightOffset = parseFloat(style.borderTopWidth) + parseFloat(style.borderBottomWidth);
        }
        // Fix when a textarea is not on document body and heightOffset is Not a Number
        if (isNaN(heightOffset)) {
          heightOffset = 0;
        }
  
        update();
      }
  
      function changeOverflow(value) {
        {
          // Chrome/Safari-specific fix:
          // When the textarea y-overflow is hidden, Chrome/Safari do not reflow the text to account for the space
          // made available by removing the scrollbar. The following forces the necessary text reflow.
          var width = ta.style.width;
          ta.style.width = '0px';
          // Force reflow:
          /* jshint ignore:start */
          ta.offsetWidth;
          /* jshint ignore:end */
          ta.style.width = width;
        }
  
        ta.style.overflowY = value;
      }
  
      function getParentOverflows(el) {
        var arr = [];
  
        while (el && el.parentNode && el.parentNode instanceof Element) {
          if (el.parentNode.scrollTop) {
            arr.push({
              node: el.parentNode,
              scrollTop: el.parentNode.scrollTop
            });
          }
          el = el.parentNode;
        }
  
        return arr;
      }
  
      function resize() {
        if (ta.scrollHeight === 0) {
          // If the scrollHeight is 0, then the element probably has display:none or is detached from the DOM.
          return;
        }
  
        var overflows = getParentOverflows(ta);
        var docTop = document.documentElement && document.documentElement.scrollTop; // Needed for Mobile IE (ticket #240)
  
        ta.style.height = '';
        ta.style.height = ta.scrollHeight + heightOffset + 'px';
  
        // used to check if an update is actually necessary on window.resize
        clientWidth = ta.clientWidth;
  
        // prevents scroll-position jumping
        overflows.forEach(function (el) {
          el.node.scrollTop = el.scrollTop;
        });
  
        if (docTop) {
          document.documentElement.scrollTop = docTop;
        }
      }
  
      function update() {
        resize();
  
        var styleHeight = Math.round(parseFloat(ta.style.height));
        var computed = window.getComputedStyle(ta, null);
  
        // Using offsetHeight as a replacement for computed.height in IE, because IE does not account use of border-box
        var actualHeight = computed.boxSizing === 'content-box' ? Math.round(parseFloat(computed.height)) : ta.offsetHeight;
  
        // The actual height not matching the style height (set via the resize method) indicates that 
        // the max-height has been exceeded, in which case the overflow should be allowed.
        if (actualHeight < styleHeight) {
          if (computed.overflowY === 'hidden') {
            changeOverflow('scroll');
            resize();
            actualHeight = computed.boxSizing === 'content-box' ? Math.round(parseFloat(window.getComputedStyle(ta, null).height)) : ta.offsetHeight;
          }
        } else {
          // Normally keep overflow set to hidden, to avoid flash of scrollbar as the textarea expands.
          if (computed.overflowY !== 'hidden') {
            changeOverflow('hidden');
            resize();
            actualHeight = computed.boxSizing === 'content-box' ? Math.round(parseFloat(window.getComputedStyle(ta, null).height)) : ta.offsetHeight;
          }
        }
  
        if (cachedHeight !== actualHeight) {
          cachedHeight = actualHeight;
          var evt = createEvent('autosize:resized');
          try {
            ta.dispatchEvent(evt);
          } catch (err) {
            // Firefox will throw an error on dispatchEvent for a detached element
            // https://bugzilla.mozilla.org/show_bug.cgi?id=889376
          }
        }
      }
  
      var pageResize = function pageResize() {
        if (ta.clientWidth !== clientWidth) {
          update();
        }
      };
  
      var destroy = function (style) {
        window.removeEventListener('resize', pageResize, false);
        ta.removeEventListener('input', update, false);
        ta.removeEventListener('keyup', update, false);
        ta.removeEventListener('autosize:destroy', destroy, false);
        ta.removeEventListener('autosize:update', update, false);
  
        Object.keys(style).forEach(function (key) {
          ta.style[key] = style[key];
        });
  
        map.delete(ta);
      }.bind(ta, {
        height: ta.style.height,
        resize: ta.style.resize,
        overflowY: ta.style.overflowY,
        overflowX: ta.style.overflowX,
        wordWrap: ta.style.wordWrap
      });
  
      ta.addEventListener('autosize:destroy', destroy, false);
  
      // IE9 does not fire onpropertychange or oninput for deletions,
      // so binding to onkeyup to catch most of those events.
      // There is no way that I know of to detect something like 'cut' in IE9.
      if ('onpropertychange' in ta && 'oninput' in ta) {
        ta.addEventListener('keyup', update, false);
      }
  
      window.addEventListener('resize', pageResize, false);
      ta.addEventListener('input', update, false);
      ta.addEventListener('autosize:update', update, false);
      ta.style.overflowX = 'hidden';
      ta.style.wordWrap = 'break-word';
  
      map.set(ta, {
        destroy: destroy,
        update: update
      });
  
      init();
    }
  
    function destroy(ta) {
      var methods = map.get(ta);
      if (methods) {
        methods.destroy();
      }
    }
  
    function update(ta) {
      var methods = map.get(ta);
      if (methods) {
        methods.update();
      }
    }
  
    var autosize = null;
  
    // Do nothing in Node.js environment and IE8 (or lower)
    if (typeof window === 'undefined' || typeof window.getComputedStyle !== 'function') {
      autosize = function autosize(el) {
        return el;
      };
      autosize.destroy = function (el) {
        return el;
      };
      autosize.update = function (el) {
        return el;
      };
    } else {
      autosize = function autosize(el, options) {
        if (el) {
          Array.prototype.forEach.call(el.length ? el : [el], function (x) {
            return assign(x, options);
          });
        }
        return el;
      };
      autosize.destroy = function (el) {
        if (el) {
          Array.prototype.forEach.call(el.length ? el : [el], destroy);
        }
        return el;
      };
      autosize.update = function (el) {
        if (el) {
          Array.prototype.forEach.call(el.length ? el : [el], update);
        }
        return el;
      };
    }
  
    exports.default = autosize;
    module.exports = exports['default'];
  });