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src/utils/dom.js

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+/* istanbul ignore next */
+
+import Vue from 'vue';
+
+const isServer = Vue.prototype.$isServer;
+const SPECIAL_CHARS_REGEXP = /([\:\-\_]+(.))/g;
+const MOZ_HACK_REGEXP = /^moz([A-Z])/;
+const ieVersion = isServer ? 0 : Number(document.documentMode);
+
+/* istanbul ignore next */
+const trim = function(string) {
+  return (string || '').replace(/^[\s\uFEFF]+|[\s\uFEFF]+$/g, '');
+};
+/* istanbul ignore next */
+const camelCase = function(name) {
+  return name.replace(SPECIAL_CHARS_REGEXP, function(_, separator, letter, offset) {
+    return offset ? letter.toUpperCase() : letter;
+  }).replace(MOZ_HACK_REGEXP, 'Moz$1');
+};
+
+/* istanbul ignore next */
+export const on = (function() {
+  if (!isServer && document.addEventListener) {
+    return function(element, event, handler) {
+      if (element && event && handler) {
+        element.addEventListener(event, handler, false);
+      }
+    };
+  } else {
+    return function(element, event, handler) {
+      if (element && event && handler) {
+        element.attachEvent('on' + event, handler);
+      }
+    };
+  }
+})();
+
+/* istanbul ignore next */
+export const off = (function() {
+  if (!isServer && document.removeEventListener) {
+    return function(element, event, handler) {
+      if (element && event) {
+        element.removeEventListener(event, handler, false);
+      }
+    };
+  } else {
+    return function(element, event, handler) {
+      if (element && event) {
+        element.detachEvent('on' + event, handler);
+      }
+    };
+  }
+})();
+
+/* istanbul ignore next */
+export const once = function(el, event, fn) {
+  var listener = function() {
+    if (fn) {
+      fn.apply(this, arguments);
+    }
+    off(el, event, listener);
+  };
+  on(el, event, listener);
+};
+
+/* istanbul ignore next */
+export function hasClass(el, cls) {
+  if (!el || !cls) return false;
+  if (cls.indexOf(' ') !== -1) throw new Error('className should not contain space.');
+  if (el.classList) {
+    return el.classList.contains(cls);
+  } else {
+    return (' ' + el.className + ' ').indexOf(' ' + cls + ' ') > -1;
+  }
+};
+
+/* istanbul ignore next */
+export function addClass(el, cls) {
+  if (!el) return;
+  var curClass = el.className;
+  var classes = (cls || '').split(' ');
+
+  for (var i = 0, j = classes.length; i < j; i++) {
+    var clsName = classes[i];
+    if (!clsName) continue;
+
+    if (el.classList) {
+      el.classList.add(clsName);
+    } else if (!hasClass(el, clsName)) {
+      curClass += ' ' + clsName;
+    }
+  }
+  if (!el.classList) {
+    el.className = curClass;
+  }
+};
+
+/* istanbul ignore next */
+export function removeClass(el, cls) {
+  if (!el || !cls) return;
+  var classes = cls.split(' ');
+  var curClass = ' ' + el.className + ' ';
+
+  for (var i = 0, j = classes.length; i < j; i++) {
+    var clsName = classes[i];
+    if (!clsName) continue;
+
+    if (el.classList) {
+      el.classList.remove(clsName);
+    } else if (hasClass(el, clsName)) {
+      curClass = curClass.replace(' ' + clsName + ' ', ' ');
+    }
+  }
+  if (!el.classList) {
+    el.className = trim(curClass);
+  }
+};
+
+/* istanbul ignore next */
+export const getStyle = ieVersion < 9 ? function(element, styleName) {
+  if (isServer) return;
+  if (!element || !styleName) return null;
+  styleName = camelCase(styleName);
+  if (styleName === 'float') {
+    styleName = 'styleFloat';
+  }
+  try {
+    switch (styleName) {
+      case 'opacity':
+        try {
+          return element.filters.item('alpha').opacity / 100;
+        } catch (e) {
+          return 1.0;
+        }
+      default:
+        return (element.style[styleName] || element.currentStyle ? element.currentStyle[styleName] : null);
+    }
+  } catch (e) {
+    return element.style[styleName];
+  }
+} : function(element, styleName) {
+  if (isServer) return;
+  if (!element || !styleName) return null;
+  styleName = camelCase(styleName);
+  if (styleName === 'float') {
+    styleName = 'cssFloat';
+  }
+  try {
+    var computed = document.defaultView.getComputedStyle(element, '');
+    return element.style[styleName] || computed ? computed[styleName] : null;
+  } catch (e) {
+    return element.style[styleName];
+  }
+};
+
+/* istanbul ignore next */
+export function setStyle(element, styleName, value) {
+  if (!element || !styleName) return;
+
+  if (typeof styleName === 'object') {
+    for (var prop in styleName) {
+      if (styleName.hasOwnProperty(prop)) {
+        setStyle(element, prop, styleName[prop]);
+      }
+    }
+  } else {
+    styleName = camelCase(styleName);
+    if (styleName === 'opacity' && ieVersion < 9) {
+      element.style.filter = isNaN(value) ? '' : 'alpha(opacity=' + value * 100 + ')';
+    } else {
+      element.style[styleName] = value;
+    }
+  }
+};
+
+export const isScroll = (el, vertical) => {
+  if (isServer) return;
+
+  const determinedDirection = vertical !== null || vertical !== undefined;
+  const overflow = determinedDirection
+    ? vertical
+      ? getStyle(el, 'overflow-y')
+      : getStyle(el, 'overflow-x')
+    : getStyle(el, 'overflow');
+
+  return overflow.match(/(scroll|auto)/);
+};
+
+export const getScrollContainer = (el, vertical) => {
+  if (isServer) return;
+
+  let parent = el;
+  while (parent) {
+    if ([window, document, document.documentElement].includes(parent)) {
+      return window;
+    }
+    if (isScroll(parent, vertical)) {
+      return parent;
+    }
+    parent = parent.parentNode;
+  }
+
+  return parent;
+};
+
+export const isInContainer = (el, container) => {
+  if (isServer || !el || !container) return false;
+
+  const elRect = el.getBoundingClientRect();
+  let containerRect;
+
+  if ([window, document, document.documentElement, null, undefined].includes(container)) {
+    containerRect = {
+      top: 0,
+      right: window.innerWidth,
+      bottom: window.innerHeight,
+      left: 0
+    };
+  } else {
+    containerRect = container.getBoundingClientRect();
+  }
+
+  return elRect.top < containerRect.bottom &&
+    elRect.bottom > containerRect.top &&
+    elRect.right > containerRect.left &&
+    elRect.left < containerRect.right;
+};