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Why is $watch used? |
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Answer» $WATCH is used for keeping track of the OLD and new values of the expression or the MODEL variable that is being watched. ONE such usage is as shown below: $scope.$watch("trackedVariable", function (newValue, oldValue){ console.log("Value Changed : ", newValue); });In the above example, we are WATCHING the model variable named trackedVariable. If its value changes, we are immediately printing on the console. |
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