AngularJS - How to Create Read More/Less Toggle using Directive?

By Hardik Savani October 20, 2023 Category : Bootstrap jQuery Angular

Sometimes, We may require to make to show read more and read less functionality in our AngularJS application. We can make read more using AngularJS Directive.

So, In this example i going to give you full example of read more text example. I used "dd-text-collapse" Directive for after some text it will return "..." OR "(more)" etc that as you want. You can simply customize this Directive. You can also make toggle read more and read less using this Directive.

First, you can see bellow code of just Directive, i give you bellow code of Directive, you can use direct in your AngularJS application. so let's see:

Directive:

app.directive('ddTextCollapse', ['$compile', function($compile) {

  return {
      restrict: 'A',
      scope: true,
      link: function(scope, element, attrs) {

          /* start collapsed */
          scope.collapsed = false;

          /* create the function to toggle the collapse */
          scope.toggle = function() {
              scope.collapsed = !scope.collapsed;
          };

          /* wait for changes on the text */
          attrs.$observe('ddTextCollapseText', function(text) {

              /* get the length from the attributes */
              var maxLength = scope.$eval(attrs.ddTextCollapseMaxLength);

              if (text.length > maxLength) {
                  /* split the text in two parts, the first always showing */
                  var firstPart = String(text).substring(0, maxLength);
                  var secondPart = String(text).substring(maxLength, text.length);

                  /* create some new html elements to hold the separate info */
                  var firstSpan = $compile('<span>' + firstPart + '</span>')(scope);
                  var secondSpan = $compile('<span ng-if="collapsed">' + secondPart + '</span>')(scope);
                  var moreIndicatorSpan = $compile('<span ng-if="!collapsed">... </span>')(scope);
                  var lineBreak = $compile('<br ng-if="collapsed">')(scope);
                  var toggleButton = $compile('<span class="collapse-text-toggle" ng-click="toggle()">{{collapsed ? "(less)" : "(more)"}}</span>')(scope);

                  /* remove the current contents of the element
                   and add the new ones we created */
                  element.empty();
                  element.append(firstSpan);
                  element.append(secondSpan);
                  element.append(moreIndicatorSpan);
                  element.append(lineBreak);
                  element.append(toggleButton);
              }
              else {
                  element.empty();
                  element.append(text);
              }
          });
      }
  };
}]);

Ok, now i will make full example of read more and read less toggle using above directive, so let's see and also you can see demo.

index.html

Read Also: How to Render HTML Value in Ng-repeat in AngularJS?
<!DOCTYPE html>
<html>
<head>
	<title>angularjs read more example</title>
        <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
	<script type="text/javascript" src="//code.jquery.com/jquery-1.4.2.min.js"></script>
        <script src = "http://ajax.googleapis.com/ajax/libs/angularjs/1.3.14/angular.min.js"></script>
        <style type="text/css">
         .collapse-text-toggle{
           font-weight: bold;
         }
       </style>
</head>
<body>

<div ng-app="mainApp" ng-controller="myController" id="mainController" class="container">
    <p dd-text-collapse dd-text-collapse-max-length="230" dd-text-collapse-text="{{ longText }}"></p>
</div>

<script type="text/javascript">

  var app = angular.module("mainApp", []);

  app.controller('myController', function($scope, $timeout) {
      $scope.longText = "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmodtempor 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.";

  });

  app.directive('ddTextCollapse', ['$compile', function($compile) {

      return {
          restrict: 'A',
          scope: true,
          link: function(scope, element, attrs) {

              /* start collapsed */
              scope.collapsed = false;

              /* create the function to toggle the collapse */
              scope.toggle = function() {
                  scope.collapsed = !scope.collapsed;
              };

              /* wait for changes on the text */
              attrs.$observe('ddTextCollapseText', function(text) {

                  /* get the length from the attributes */
                  var maxLength = scope.$eval(attrs.ddTextCollapseMaxLength);

                  if (text.length > maxLength) {
                      /* split the text in two parts, the first always showing */
                      var firstPart = String(text).substring(0, maxLength);
                      var secondPart = String(text).substring(maxLength, text.length);

                      /* create some new html elements to hold the separate info */
                      var firstSpan = $compile('<span>' + firstPart + '</span>')(scope);
                      var secondSpan = $compile('<span ng-if="collapsed">' + secondPart + '</span>')(scope);
                      var moreIndicatorSpan = $compile('<span ng-if="!collapsed">... </span>')(scope);
                      var lineBreak = $compile('<br ng-if="collapsed">')(scope);
                      var toggleButton = $compile('<span class="collapse-text-toggle" ng-click="toggle()">{{collapsed ? "(less)" : "(more)"}}</span>')(scope);

                      /* remove the current contents of the element
                       and add the new ones we created */
                      element.empty();
                      element.append(firstSpan);
                      element.append(secondSpan);
                      element.append(moreIndicatorSpan);
                      element.append(lineBreak);
                      element.append(toggleButton);
                  }
                  else {
                      element.empty();
                      element.append(text);
                  }
              });
          }
      };
  }]);

</script>

</body>
</html>

I hope it can help you...

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