When using AngularJS filter, the comparator will evaluate to true and display the ng-repeat list even when the input

Recently, I stumbled upon this interesting example fiddle showcasing the use of a comparator parameter to filter exact matches:

http://jsfiddle.net/api/post/library/pure/

The priority is supposed to be a number between 1-100, but due to inputting it as text and filtering it as a string, any data that includes a substring will also pass through the ng-repeat. For example, when typing '1', it displays not only '1' but also '11', '111', '132', etc., leading me to discover the ':true' comparator.

While some stackflow answers advised writing custom filter functions, using the true comparator seems to accomplish what I need with ease:

<input type="text" class="form-control" id="search.priority"
  title='Priority number to filter by'
  ng-model="search.priority" >

<tr ng-repeat="workflowItem in workflows | filter:search:true">
  <td>{{workflowItem.priority}}</td>

This code successfully filters out exact matches only. However, the downside is that it won't display anything when the input field is empty, as there are no matches for an empty string.

Hence, my question arises: Is there a way to configure ng-repeat to show all items when the filter field is empty while still maintaining the exact match filter? Any suggestions or solutions would be greatly appreciated! Thank you!

Answer №1

To achieve a specific comparison based on certain conditions, it is recommended to utilize a custom comparator function.

Here is an example of how you can incorporate this custom comparator function into your markup:

 <input type="text" class="form-control" id="search.priority"
  title='Priority number to filter by'
  ng-model="search.priority" >

<tr ng-repeat="workflowItem in workflows | filter:search:exceptEmptyComparator">
 <td>{{workflowItem.priority}}</td>

In order to make this work, define the comparator function within your controller:

$scope.exceptEmptyComparator = function (actual, expected) {
    if (!expected) {
       return true;
    }
    return angular.equals(expected, actual);
}

This setup should help you accomplish what you need.

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