bootstrap 4 beta 2

Bootstrap 4 beta 2

4 beta 2/js/util.js

@@ -0,0 +1,161 @@
+/**
+ * --------------------------------------------------------------------------
+ * Bootstrap (v4.0.0-alpha.6): util.js
+ * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
+ * --------------------------------------------------------------------------
+ */
+
+const Util = (($) => {
+
+
+  /**
+   * ------------------------------------------------------------------------
+   * Private TransitionEnd Helpers
+   * ------------------------------------------------------------------------
+   */
+
+  let transition = false
+
+  const MAX_UID = 1000000
+
+  const TransitionEndEvent = {
+    WebkitTransition : 'webkitTransitionEnd',
+    MozTransition    : 'transitionend',
+    OTransition      : 'oTransitionEnd otransitionend',
+    transition       : 'transitionend'
+  }
+
+  // shoutout AngusCroll (https://goo.gl/pxwQGp)
+  function toType(obj) {
+    return {}.toString.call(obj).match(/\s([a-zA-Z]+)/)[1].toLowerCase()
+  }
+
+  function isElement(obj) {
+    return (obj[0] || obj).nodeType
+  }
+
+  function getSpecialTransitionEndEvent() {
+    return {
+      bindType: transition.end,
+      delegateType: transition.end,
+      handle(event) {
+        if ($(event.target).is(this)) {
+          return event.handleObj.handler.apply(this, arguments) // eslint-disable-line prefer-rest-params
+        }
+        return undefined
+      }
+    }
+  }
+
+  function transitionEndTest() {
+    if (window.QUnit) {
+      return false
+    }
+
+    const el = document.createElement('bootstrap')
+
+    for (const name in TransitionEndEvent) {
+      if (el.style[name] !== undefined) {
+        return {
+          end: TransitionEndEvent[name]
+        }
+      }
+    }
+
+    return false
+  }
+
+  function transitionEndEmulator(duration) {
+    let called = false
+
+    $(this).one(Util.TRANSITION_END, () => {
+      called = true
+    })
+
+    setTimeout(() => {
+      if (!called) {
+        Util.triggerTransitionEnd(this)
+      }
+    }, duration)
+
+    return this
+  }
+
+  function setTransitionEndSupport() {
+    transition = transitionEndTest()
+
+    $.fn.emulateTransitionEnd = transitionEndEmulator
+
+    if (Util.supportsTransitionEnd()) {
+      $.event.special[Util.TRANSITION_END] = getSpecialTransitionEndEvent()
+    }
+  }
+
+
+  /**
+   * --------------------------------------------------------------------------
+   * Public Util Api
+   * --------------------------------------------------------------------------
+   */
+
+  const Util = {
+
+    TRANSITION_END: 'bsTransitionEnd',
+
+    getUID(prefix) {
+      do {
+        // eslint-disable-next-line no-bitwise
+        prefix += ~~(Math.random() * MAX_UID) // "~~" acts like a faster Math.floor() here
+      } while (document.getElementById(prefix))
+      return prefix
+    },
+
+    getSelectorFromElement(element) {
+      let selector = element.getAttribute('data-target')
+
+      if (!selector) {
+        selector = element.getAttribute('href') || ''
+        selector = /^#[a-z]/i.test(selector) ? selector : null
+      }
+
+      return selector
+    },
+
+    reflow(element) {
+      return element.offsetHeight
+    },
+
+    triggerTransitionEnd(element) {
+      $(element).trigger(transition.end)
+    },
+
+    supportsTransitionEnd() {
+      return Boolean(transition)
+    },
+
+    typeCheckConfig(componentName, config, configTypes) {
+      for (const property in configTypes) {
+        if (configTypes.hasOwnProperty(property)) {
+          const expectedTypes = configTypes[property]
+          const value         = config[property]
+          const valueType     = value && isElement(value) ?
+                                'element' : toType(value)
+
+          if (!new RegExp(expectedTypes).test(valueType)) {
+            throw new Error(
+              `${componentName.toUpperCase()}: ` +
+              `Option "${property}" provided type "${valueType}" ` +
+              `but expected type "${expectedTypes}".`)
+          }
+        }
+      }
+    }
+  }
+
+  setTransitionEndSupport()
+
+  return Util
+
+})(jQuery)
+
+export default Util