KnockoutJS - reverse() Method

Description

The KnockoutJS Observable reverse() method reverses the order of the array.

Syntax

arrayName.reverse()

Parameters

Does not accept any parameter.

Example

Live Demo

<!DOCTYPE html>
   <head>
      <title>KnockoutJS ObservableArray reverse method</title>
      <script src = "https://ajax.aspnetcdn.com/ajax/knockout/knockout-3.1.0.js"
         type = "text/javascript"></script>
   </head>

   <body>
      <p>Example to demonstrate reverse() method.</p>
      <button data-bind = "click: revEmp">Reverse Array</button>
      <p>Array of employees: <span data-bind = "text: empArray()" ></span></p>

      <script>
         function EmployeeModel() {
            this.empName = ko.observable("");
            this.chosenItem = ko.observableArray("");
            this.empArray = ko.observableArray(['Scott','James','Jordan','Lee',
               'RoseMary','Kathie']);

            this.revEmp = function() {
               this.empArray.reverse();  // reverse order
            }
         }
         
         var em = new EmployeeModel();
         ko.applyBindings(em);
      </script>
      
   </body>
</html>

Output

Let's carry out the following steps to see how the above code works −

Save the above code in array-reverse.htm file.
Open this HTML file in a browser.
Click the Reverse Array button and observe that the array order is changed.

knockoutjs_observables.htm

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