---
title: "knockoutjs comparing the current row element with the previous row element."  
description: "knockoutjs comparing the current row element with the previous row element."  
author: "Utpal Vishwas"  
published: 2023-04-30  
updated: 2023-11-20  
canonical: https://www.mindstick.com/forum/158089/knockoutjs-comparing-the-current-row-element-with-the-previous-row-element  
category: "javascript"  
tags: ["knockout.js"]  
reading_time: 2 minutes  

---

# knockoutjs comparing the current row element with the previous row element.

[knockoutjs](https://www.mindstick.com/forum/157857/what-is-knockoutjs-and-how-does-it-differ-from-other-javascript-frameworks) comparing the current [row](https://www.mindstick.com/forum/1212/this-row-already-belongs-to-this-table) element with the [previous](https://yourviews.mindstick.com/view/81421/unlock-2-0-is-just-like-previous-corona-lockdowns) row element.

## Replies

### Reply by Aryan Kumar

In Knockout.js, you can compare the current row element with the previous row element by utilizing the **foreach** binding and the **$index** context variable. Here's an example of how you can achieve this:

Suppose you have an observable array in your view model, and you're using the **foreach** binding to iterate over the array. You can use the **$index** context variable to compare the current row with the previous one.

HTML:

```plaintext
<div data-bind="foreach: items">
    <div>
        <span data-bind="text: name"></span>
        <!-- Add your comparison logic here using $index -->
        <span data-bind="visible: $index() > 0 && items()[$index()].name !== items()[$index() - 1].name">
            <!-- Display something if the current name is different from the previous one -->
            (Name changed)
        </span>
    </div>
</div>
```

JavaScript (Knockout.js):

```plaintext
function ViewModel() {
    var self = this;

    self.items = ko.observableArray([
        { name: 'John' },
        { name: 'Jane' },
        { name: 'John' },
        { name: 'Doe' }
    ]);
}

ko.applyBindings(new ViewModel());
```

In this example, the **$index()** function returns the index of the current iteration, and we use it to access the current and previous elements in the observable array (**items**). The comparison logic is placed inside the **visible** binding, and you can customize it based on your specific requirements.

This example assumes that the array contains objects with a property named **name**, and it displays a message when the name changes from one row to the next. Adjust the property names and comparison logic according to your actual data structure and requirements.


---

Original Source: https://www.mindstick.com/forum/158089/knockoutjs-comparing-the-current-row-element-with-the-previous-row-element

Copyright © MindStick Software Pvt. Ltd. This Markdown version is provided for developers, AI systems, and offline reading.