Creates a new array or string containing only a specified number of elements. The elements
are taken from either the beginning or the end of the source array or string, as specified by
the value and sign (positive or negative) of limit
.
{{ limitTo_expression | limitTo : limit}}
$filter('limitTo')(input, limit)
Param | Type | Details |
---|---|---|
input | Arraystring |
Source array or string to be limited. |
limit | stringnumber |
The length of the returned array or string. If the |
Arraystring | A new sub-array or substring of length |
<script>
function Ctrl($scope) {
$scope.numbers = [1,2,3,4,5,6,7,8,9];
$scope.letters = "abcdefghi";
$scope.numLimit = 3;
$scope.letterLimit = 3;
}
</script>
<div ng-controller="Ctrl">
Limit {{numbers}} to: <input type="integer" ng-model="numLimit">
<p>Output numbers: {{ numbers | limitTo:numLimit }}</p>
Limit {{letters}} to: <input type="integer" ng-model="letterLimit">
<p>Output letters: {{ letters | limitTo:letterLimit }}</p>
</div>
var numLimitInput = element(by.model('numLimit'));
var letterLimitInput = element(by.model('letterLimit'));
var limitedNumbers = element(by.binding('numbers | limitTo:numLimit'));
var limitedLetters = element(by.binding('letters | limitTo:letterLimit'));
it('should limit the number array to first three items', function() {
expect(numLimitInput.getAttribute('value')).toBe('3');
expect(letterLimitInput.getAttribute('value')).toBe('3');
expect(limitedNumbers.getText()).toEqual('Output numbers: [1,2,3]');
expect(limitedLetters.getText()).toEqual('Output letters: abc');
});
it('should update the output when -3 is entered', function() {
numLimitInput.clear();
numLimitInput.sendKeys('-3');
letterLimitInput.clear();
letterLimitInput.sendKeys('-3');
expect(limitedNumbers.getText()).toEqual('Output numbers: [7,8,9]');
expect(limitedLetters.getText()).toEqual('Output letters: ghi');
});
it('should not exceed the maximum size of input array', function() {
numLimitInput.clear();
numLimitInput.sendKeys('100');
letterLimitInput.clear();
letterLimitInput.sendKeys('100');
expect(limitedNumbers.getText()).toEqual('Output numbers: [1,2,3,4,5,6,7,8,9]');
expect(limitedLetters.getText()).toEqual('Output letters: abcdefghi');
});