Using Regular Expressions in JavaScript for Filtering with Angular.js

I am looking to create a custom filter in Angular.js.

When an object has a name == null, and I add "u" to the filter->, it results in the return of the object where name == null because re.test(null)=true. However, other characters are returning false. Can you explain why this is happening? What can I do to prevent this scenario?

Answer №1

Make sure to verify if the obj.name variable is defined before using it with the regular expression check:

$scope.searchFilter = function(obj) {
  var regex = new RegExp($scope.searchText, 'i');
  return !$scope.searchText || (obj.name && regex.test(obj.name)) || regex.test(obj.age.toString());
};

If you don't do this, converting null to a string will result in "null", which will match the regular expression.

Check out this demo: http://jsfiddle.net/26fZb/232/

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