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author | Florian Dold <florian.dold@gmail.com> | 2017-05-03 15:35:00 +0200 |
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committer | Florian Dold <florian.dold@gmail.com> | 2017-05-03 15:35:00 +0200 |
commit | de98e0b232509d5f40c135d540a70e415272ff85 (patch) | |
tree | a79222a5b58484ab3b80d18efcaaa7ccc4769b33 /node_modules/react-dom/lib/ChangeEventPlugin.js | |
parent | e0c9d480a73fa629c1e4a47d3e721f1d2d345406 (diff) |
node_modules
Diffstat (limited to 'node_modules/react-dom/lib/ChangeEventPlugin.js')
-rw-r--r-- | node_modules/react-dom/lib/ChangeEventPlugin.js | 345 |
1 files changed, 345 insertions, 0 deletions
diff --git a/node_modules/react-dom/lib/ChangeEventPlugin.js b/node_modules/react-dom/lib/ChangeEventPlugin.js new file mode 100644 index 000000000..808bdbf46 --- /dev/null +++ b/node_modules/react-dom/lib/ChangeEventPlugin.js @@ -0,0 +1,345 @@ +/** + * Copyright 2013-present, Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under the BSD-style license found in the + * LICENSE file in the root directory of this source tree. An additional grant + * of patent rights can be found in the PATENTS file in the same directory. + * + */ + +'use strict'; + +var EventPluginHub = require('./EventPluginHub'); +var EventPropagators = require('./EventPropagators'); +var ExecutionEnvironment = require('fbjs/lib/ExecutionEnvironment'); +var ReactDOMComponentTree = require('./ReactDOMComponentTree'); +var ReactUpdates = require('./ReactUpdates'); +var SyntheticEvent = require('./SyntheticEvent'); + +var getEventTarget = require('./getEventTarget'); +var isEventSupported = require('./isEventSupported'); +var isTextInputElement = require('./isTextInputElement'); + +var eventTypes = { + change: { + phasedRegistrationNames: { + bubbled: 'onChange', + captured: 'onChangeCapture' + }, + dependencies: ['topBlur', 'topChange', 'topClick', 'topFocus', 'topInput', 'topKeyDown', 'topKeyUp', 'topSelectionChange'] + } +}; + +/** + * For IE shims + */ +var activeElement = null; +var activeElementInst = null; +var activeElementValue = null; +var activeElementValueProp = null; + +/** + * SECTION: handle `change` event + */ +function shouldUseChangeEvent(elem) { + var nodeName = elem.nodeName && elem.nodeName.toLowerCase(); + return nodeName === 'select' || nodeName === 'input' && elem.type === 'file'; +} + +var doesChangeEventBubble = false; +if (ExecutionEnvironment.canUseDOM) { + // See `handleChange` comment below + doesChangeEventBubble = isEventSupported('change') && (!document.documentMode || document.documentMode > 8); +} + +function manualDispatchChangeEvent(nativeEvent) { + var event = SyntheticEvent.getPooled(eventTypes.change, activeElementInst, nativeEvent, getEventTarget(nativeEvent)); + EventPropagators.accumulateTwoPhaseDispatches(event); + + // If change and propertychange bubbled, we'd just bind to it like all the + // other events and have it go through ReactBrowserEventEmitter. Since it + // doesn't, we manually listen for the events and so we have to enqueue and + // process the abstract event manually. + // + // Batching is necessary here in order to ensure that all event handlers run + // before the next rerender (including event handlers attached to ancestor + // elements instead of directly on the input). Without this, controlled + // components don't work properly in conjunction with event bubbling because + // the component is rerendered and the value reverted before all the event + // handlers can run. See https://github.com/facebook/react/issues/708. + ReactUpdates.batchedUpdates(runEventInBatch, event); +} + +function runEventInBatch(event) { + EventPluginHub.enqueueEvents(event); + EventPluginHub.processEventQueue(false); +} + +function startWatchingForChangeEventIE8(target, targetInst) { + activeElement = target; + activeElementInst = targetInst; + activeElement.attachEvent('onchange', manualDispatchChangeEvent); +} + +function stopWatchingForChangeEventIE8() { + if (!activeElement) { + return; + } + activeElement.detachEvent('onchange', manualDispatchChangeEvent); + activeElement = null; + activeElementInst = null; +} + +function getTargetInstForChangeEvent(topLevelType, targetInst) { + if (topLevelType === 'topChange') { + return targetInst; + } +} +function handleEventsForChangeEventIE8(topLevelType, target, targetInst) { + if (topLevelType === 'topFocus') { + // stopWatching() should be a noop here but we call it just in case we + // missed a blur event somehow. + stopWatchingForChangeEventIE8(); + startWatchingForChangeEventIE8(target, targetInst); + } else if (topLevelType === 'topBlur') { + stopWatchingForChangeEventIE8(); + } +} + +/** + * SECTION: handle `input` event + */ +var isInputEventSupported = false; +if (ExecutionEnvironment.canUseDOM) { + // IE9 claims to support the input event but fails to trigger it when + // deleting text, so we ignore its input events. + // IE10+ fire input events to often, such when a placeholder + // changes or when an input with a placeholder is focused. + isInputEventSupported = isEventSupported('input') && (!document.documentMode || document.documentMode > 11); +} + +/** + * (For IE <=11) Replacement getter/setter for the `value` property that gets + * set on the active element. + */ +var newValueProp = { + get: function () { + return activeElementValueProp.get.call(this); + }, + set: function (val) { + // Cast to a string so we can do equality checks. + activeElementValue = '' + val; + activeElementValueProp.set.call(this, val); + } +}; + +/** + * (For IE <=11) Starts tracking propertychange events on the passed-in element + * and override the value property so that we can distinguish user events from + * value changes in JS. + */ +function startWatchingForValueChange(target, targetInst) { + activeElement = target; + activeElementInst = targetInst; + activeElementValue = target.value; + activeElementValueProp = Object.getOwnPropertyDescriptor(target.constructor.prototype, 'value'); + + // Not guarded in a canDefineProperty check: IE8 supports defineProperty only + // on DOM elements + Object.defineProperty(activeElement, 'value', newValueProp); + if (activeElement.attachEvent) { + activeElement.attachEvent('onpropertychange', handlePropertyChange); + } else { + activeElement.addEventListener('propertychange', handlePropertyChange, false); + } +} + +/** + * (For IE <=11) Removes the event listeners from the currently-tracked element, + * if any exists. + */ +function stopWatchingForValueChange() { + if (!activeElement) { + return; + } + + // delete restores the original property definition + delete activeElement.value; + + if (activeElement.detachEvent) { + activeElement.detachEvent('onpropertychange', handlePropertyChange); + } else { + activeElement.removeEventListener('propertychange', handlePropertyChange, false); + } + + activeElement = null; + activeElementInst = null; + activeElementValue = null; + activeElementValueProp = null; +} + +/** + * (For IE <=11) Handles a propertychange event, sending a `change` event if + * the value of the active element has changed. + */ +function handlePropertyChange(nativeEvent) { + if (nativeEvent.propertyName !== 'value') { + return; + } + var value = nativeEvent.srcElement.value; + if (value === activeElementValue) { + return; + } + activeElementValue = value; + + manualDispatchChangeEvent(nativeEvent); +} + +/** + * If a `change` event should be fired, returns the target's ID. + */ +function getTargetInstForInputEvent(topLevelType, targetInst) { + if (topLevelType === 'topInput') { + // In modern browsers (i.e., not IE8 or IE9), the input event is exactly + // what we want so fall through here and trigger an abstract event + return targetInst; + } +} + +function handleEventsForInputEventIE(topLevelType, target, targetInst) { + if (topLevelType === 'topFocus') { + // In IE8, we can capture almost all .value changes by adding a + // propertychange handler and looking for events with propertyName + // equal to 'value' + // In IE9-11, propertychange fires for most input events but is buggy and + // doesn't fire when text is deleted, but conveniently, selectionchange + // appears to fire in all of the remaining cases so we catch those and + // forward the event if the value has changed + // In either case, we don't want to call the event handler if the value + // is changed from JS so we redefine a setter for `.value` that updates + // our activeElementValue variable, allowing us to ignore those changes + // + // stopWatching() should be a noop here but we call it just in case we + // missed a blur event somehow. + stopWatchingForValueChange(); + startWatchingForValueChange(target, targetInst); + } else if (topLevelType === 'topBlur') { + stopWatchingForValueChange(); + } +} + +// For IE8 and IE9. +function getTargetInstForInputEventIE(topLevelType, targetInst) { + if (topLevelType === 'topSelectionChange' || topLevelType === 'topKeyUp' || topLevelType === 'topKeyDown') { + // On the selectionchange event, the target is just document which isn't + // helpful for us so just check activeElement instead. + // + // 99% of the time, keydown and keyup aren't necessary. IE8 fails to fire + // propertychange on the first input event after setting `value` from a + // script and fires only keydown, keypress, keyup. Catching keyup usually + // gets it and catching keydown lets us fire an event for the first + // keystroke if user does a key repeat (it'll be a little delayed: right + // before the second keystroke). Other input methods (e.g., paste) seem to + // fire selectionchange normally. + if (activeElement && activeElement.value !== activeElementValue) { + activeElementValue = activeElement.value; + return activeElementInst; + } + } +} + +/** + * SECTION: handle `click` event + */ +function shouldUseClickEvent(elem) { + // Use the `click` event to detect changes to checkbox and radio inputs. + // This approach works across all browsers, whereas `change` does not fire + // until `blur` in IE8. + return elem.nodeName && elem.nodeName.toLowerCase() === 'input' && (elem.type === 'checkbox' || elem.type === 'radio'); +} + +function getTargetInstForClickEvent(topLevelType, targetInst) { + if (topLevelType === 'topClick') { + return targetInst; + } +} + +function handleControlledInputBlur(inst, node) { + // TODO: In IE, inst is occasionally null. Why? + if (inst == null) { + return; + } + + // Fiber and ReactDOM keep wrapper state in separate places + var state = inst._wrapperState || node._wrapperState; + + if (!state || !state.controlled || node.type !== 'number') { + return; + } + + // If controlled, assign the value attribute to the current value on blur + var value = '' + node.value; + if (node.getAttribute('value') !== value) { + node.setAttribute('value', value); + } +} + +/** + * This plugin creates an `onChange` event that normalizes change events + * across form elements. This event fires at a time when it's possible to + * change the element's value without seeing a flicker. + * + * Supported elements are: + * - input (see `isTextInputElement`) + * - textarea + * - select + */ +var ChangeEventPlugin = { + + eventTypes: eventTypes, + + extractEvents: function (topLevelType, targetInst, nativeEvent, nativeEventTarget) { + var targetNode = targetInst ? ReactDOMComponentTree.getNodeFromInstance(targetInst) : window; + + var getTargetInstFunc, handleEventFunc; + if (shouldUseChangeEvent(targetNode)) { + if (doesChangeEventBubble) { + getTargetInstFunc = getTargetInstForChangeEvent; + } else { + handleEventFunc = handleEventsForChangeEventIE8; + } + } else if (isTextInputElement(targetNode)) { + if (isInputEventSupported) { + getTargetInstFunc = getTargetInstForInputEvent; + } else { + getTargetInstFunc = getTargetInstForInputEventIE; + handleEventFunc = handleEventsForInputEventIE; + } + } else if (shouldUseClickEvent(targetNode)) { + getTargetInstFunc = getTargetInstForClickEvent; + } + + if (getTargetInstFunc) { + var inst = getTargetInstFunc(topLevelType, targetInst); + if (inst) { + var event = SyntheticEvent.getPooled(eventTypes.change, inst, nativeEvent, nativeEventTarget); + event.type = 'change'; + EventPropagators.accumulateTwoPhaseDispatches(event); + return event; + } + } + + if (handleEventFunc) { + handleEventFunc(topLevelType, targetNode, targetInst); + } + + // When blurring, set the value attribute for number inputs + if (topLevelType === 'topBlur') { + handleControlledInputBlur(targetInst, targetNode); + } + } + +}; + +module.exports = ChangeEventPlugin;
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