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;
+\ No newline at end of file