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Diffstat (limited to 'node_modules/react-dom/lib/inputValueTracking.js')
-rw-r--r-- | node_modules/react-dom/lib/inputValueTracking.js | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/node_modules/react-dom/lib/inputValueTracking.js b/node_modules/react-dom/lib/inputValueTracking.js new file mode 100644 index 000000000..7a7fa137a --- /dev/null +++ b/node_modules/react-dom/lib/inputValueTracking.js @@ -0,0 +1,122 @@ +/** + * 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 ReactDOMComponentTree = require('./ReactDOMComponentTree'); + +function isCheckable(elem) { + var type = elem.type; + var nodeName = elem.nodeName; + return nodeName && nodeName.toLowerCase() === 'input' && (type === 'checkbox' || type === 'radio'); +} + +function getTracker(inst) { + return inst._wrapperState.valueTracker; +} + +function attachTracker(inst, tracker) { + inst._wrapperState.valueTracker = tracker; +} + +function detachTracker(inst) { + delete inst._wrapperState.valueTracker; +} + +function getValueFromNode(node) { + var value; + if (node) { + value = isCheckable(node) ? '' + node.checked : node.value; + } + return value; +} + +var inputValueTracking = { + // exposed for testing + _getTrackerFromNode: function (node) { + return getTracker(ReactDOMComponentTree.getInstanceFromNode(node)); + }, + + + track: function (inst) { + if (getTracker(inst)) { + return; + } + + var node = ReactDOMComponentTree.getNodeFromInstance(inst); + var valueField = isCheckable(node) ? 'checked' : 'value'; + var descriptor = Object.getOwnPropertyDescriptor(node.constructor.prototype, valueField); + + var currentValue = '' + node[valueField]; + + // if someone has already defined a value or Safari, then bail + // and don't track value will cause over reporting of changes, + // but it's better then a hard failure + // (needed for certain tests that spyOn input values and Safari) + if (node.hasOwnProperty(valueField) || typeof descriptor.get !== 'function' || typeof descriptor.set !== 'function') { + return; + } + + Object.defineProperty(node, valueField, { + enumerable: descriptor.enumerable, + configurable: true, + get: function () { + return descriptor.get.call(this); + }, + set: function (value) { + currentValue = '' + value; + descriptor.set.call(this, value); + } + }); + + attachTracker(inst, { + getValue: function () { + return currentValue; + }, + setValue: function (value) { + currentValue = '' + value; + }, + stopTracking: function () { + detachTracker(inst); + delete node[valueField]; + } + }); + }, + + updateValueIfChanged: function (inst) { + if (!inst) { + return false; + } + var tracker = getTracker(inst); + + if (!tracker) { + inputValueTracking.track(inst); + return true; + } + + var lastValue = tracker.getValue(); + var nextValue = getValueFromNode(ReactDOMComponentTree.getNodeFromInstance(inst)); + + if (nextValue !== lastValue) { + tracker.setValue(nextValue); + return true; + } + + return false; + }, + stopTracking: function (inst) { + var tracker = getTracker(inst); + if (tracker) { + tracker.stopTracking(); + } + } +}; + +module.exports = inputValueTracking;
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