"Implementing conditional evaluation for pixel units in AngularJS using ng-style

Looking to adjust the style of an element based on its height. For example, if the height is less than X, apply 'style 1'; otherwise, apply 'style 2'.

The syntax appears to be correct, but accurately evaluating the height property in pixels remains a challenge.

ng-class="{true:'panel panel-success', false:'panel panel-danger'}[documents.length > 0]"

functions perfectly, however

ng-class="{true:'panel panel-success', false:'panel panel-danger'}[height < 200px]"

does not produce the desired outcome

Answer №1

height < 200px is not a valid condition since 200px contains non-numeric characters.

An alternative approach would be to use the following method:

<div class="panel" ng-class="height < 200 ? 'panel-success' : 'panel-danger'">
    ...
</div>

Answer №2

Enhancing your HTML with custom directives for DOM manipulation!

var elemstyle = angular.module('elemstyle', []);

elemstyle.controller('HeightBasedElCtrl', ['$scope', function($scope){ 

  $scope.data = {
    maxH : 200
  };

}]);


elemstyle.directive('heightBasedCss', [function(){
  return {
    transclude : true,
    template : '<div ng-class="{true : \'panel panel-success\', false: \'panel panel-danger\'} [ checkHeight() ]" ng-transclude><div>',
    link: function(scope, elem, attrs) {

        scope.checkHeight = function() {

            return elem[0].offsetHeight < scope.data.maxH; 
        };
    }  
  };
}]);

Implement the directive by adding this to your HTML:

<div height-based-css>
    <!-- 
        Add any desired content within this element... 
    -->
</div>

Try out the demo on jsfiddle here: http://jsfiddle.net/jfabfab/cL3Lda69/

Run jasmine tests for functionality verification: http://jsfiddle.net/jfabfab/taakfhhs/

Note about the jsfiddle version: Used textarea binding to demonstrate real-time style changes + Future plan for jasmine test on element offsetHeight alterations.

Hope this information proves useful to you.

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