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/**
* 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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