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gaia/apps/costcontrol/js/views/BalanceLowLimitView.js

@@ -0,0 +1,44 @@
+/* exported BalanceLowLimitView */
+'use strict';
+
+function BalanceLowLimitView(lowLimitEnabler, lowLimitInput) {
+  var self = this;
+
+  self._lowLimitEnabler = lowLimitEnabler;
+  self._lowLimitInput = lowLimitInput;
+  self._lowLimitEnabler.addEventListener('change', self);
+  self._lowLimitInput.addEventListener('input', self);
+  installProperties();
+  self.validate();
+
+  function installProperties() {
+    var disabled = false;
+    Object.defineProperty(self, 'disabled', {
+      get: function() {
+        return disabled;
+      },
+      set: function(value) {
+        disabled = value;
+        self._lowLimitEnabler.disabled = disabled;
+        self._lowLimitInput.disabled = disabled;
+        self.validate();
+      }
+    });
+  }
+}
+
+BalanceLowLimitView.prototype.handleEvent = function() {
+  this.validate();
+};
+
+BalanceLowLimitView.prototype.validate = function(e) {
+  var numericValue = parseFloat(this._lowLimitInput.value, 10);
+
+  this._isValid = this.disabled || !this._lowLimitEnabler.checked ||
+                  !Number.isNaN(numericValue) && numericValue > 0;
+
+  this._lowLimitInput.classList[this._isValid ? 'remove' : 'add']('error');
+  if (typeof this.onvalidation === 'function') {
+    this.onvalidation({type: 'validation', isValid: this._isValid});
+  }
+};