KnockoutJS - push() Method


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Description

The KnockoutJS Observable push('value') method inserts a new item at the end of an array.

Syntax

arrayName.push('value')

Parameters

Accepts only one parameter, that is the value to be inserted.

Example

<!DOCTYPE html>
   <head>
      <title>KnockoutJS Observable Array push() 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 push() method.</p>
      <p>Enter name: <input data-bind = 'value: empName' /></p>
      <p><button data-bind = "click: addEmp">Add Emp </button></p>
      <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']);  //Initial Values
            
            this.addEmp = function() {
               
               if (this.empName() != "") {
                  this.empArray.push(this.empName());    //insert accepted value in array
                  this.empName("");
               }
            }.bind(this);
         }
         
         var emp = new EmployeeModel();
         ko.applyBindings(emp);
      </script>
      
   </body>
</html>

Output

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

  • Save the above code in array-push.htm file.

  • Open this HTML file in a browser.

  • Type 'Tom' as an input and click the Add Emp button.

knockoutjs_observables.htm
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