angular.module('app', [])
.controller('TestController', function($scope) {
$scope.loremIpsum = 'Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.';
})
.directive('showMore', function() {
return {
restrict: 'A',
transclude: true,
template: [
'<div class="show-more-container"><ng-transclude></ng-transclude></div>',
'<a href="#" class="show-more-expand">More</a>',
'<a href="#" class="show-more-collapse">Less</a>',
].join(''),
link: function(scope, element, attrs, controller) {
var maxHeight = 45;
var initialized = null;
var containerDom = element.children()[0];
var $showMore = angular.element(element.children()[1]);
var $showLess = angular.element(element.children()[2]);
scope.$watch(function () {
// Watch for any change in the innerHTML. The container may start off empty or small,
// and then grow as data is added.
return containerDom.innerHTML;
}, function () {
if (null !== initialized) {
// This collapse has already been initialized.
return;
}
if (containerDom.clientHeight <= maxHeight) {
// Don't initialize collapse unless the content container is too tall.
return;
}
$showMore.on('click', function () {
element.removeClass('show-more-collapsed');
element.addClass('show-more-expanded');
containerDom.style.height = null;
});
$showLess.on('click', function () {
element.removeClass('show-more-expanded');
element.addClass('show-more-collapsed');
containerDom.style.height = maxHeight + 'px';
});
initialized = true;
$showLess.triggerHandler('click');
});
},
};
});
.show-more-container {
overflow: hidden;
}
.show-more-collapse, .show-more-expand {
text-align: center;
display: none;
}
.show-more-expanded > .show-more-collapse {
display: inherit;
}
.show-more-collapsed > .show-more-expand {
display: inherit;
}
<script src="https://code.angularjs.org/1.5.8/angular.js"></script>
<div ng-app="app" ng-controller="TestController">
<div show-more>
All sorts of <strong>stuff</strong> can go in here.
{{ loremIpsum }}
<div>Even more divs</div>.
</div>
<div show-more>
This <strong>won't</strong> truncate.
</div>
</div>