Mastering Dgrid Custom Sort with Secondary Sort Column

Mastering Dgrid Custom Sort with Secondary Sort Column

Dgrid is a powerful, flexible grid component for Dojo, an open-source JavaScript toolkit. It’s a popular choice among data scientists for its robust features, including sorting, pagination, and keyboard navigation. In this blog post, we’ll delve into the intricacies of implementing a dgrid custom sort with a secondary sort column.

Introduction to Dgrid Sorting

Dgrid provides built-in sorting capabilities that allow users to sort data in ascending or descending order by clicking on the column headers. However, there may be instances where you need to sort by more than one column, also known as secondary sorting. This is where dgrid’s custom sorting functionality comes into play.

Implementing Dgrid Custom Sort with Secondary Sort Column

To implement a custom sort with a secondary sort column in dgrid, you’ll need to override the sort function of the store you’re using. Let’s walk through the steps.

Step 1: Set Up Your Dgrid

First, you need to set up your dgrid. Here’s a basic example:

require([
  'dojo/_base/declare',
  'dgrid/OnDemandGrid',
  'dgrid/Keyboard',
  'dgrid/Selection'
], function (declare, OnDemandGrid, Keyboard, Selection) {
  var CustomGrid = declare([ OnDemandGrid, Keyboard, Selection ]);
  var grid = new CustomGrid({
    columns: {
      col1: 'Column 1',
      col2: 'Column 2'
    }
  }, 'grid');
  grid.startup();
});

Step 2: Override the Sort Function

Next, override the sort function of your store. This function takes an array of sort attributes, each containing a property and an optional descending flag.

var store = new Memory({
  data: data,
  sort: function (sortAttributes) {
    return this.query({}, {
      sort: sortAttributes
    });
  }
});

Step 3: Implement Secondary Sorting

To implement secondary sorting, add a secondary attribute to the sort attributes array. The secondary attribute will be used for sorting when the primary attribute values are equal.

grid.set('sort', [
  { property: 'col1', descending: false },
  { property: 'col2', descending: true }
]);

In this example, the grid will primarily sort by ‘col1’ in ascending order. If there are any ties, it will then sort by ‘col2’ in descending order.

Conclusion

Mastering dgrid’s custom sort with a secondary sort column can significantly enhance your data manipulation capabilities, providing a more nuanced view of your data. While it may seem complex at first, with a bit of practice, you’ll find it’s a powerful tool in your data science toolkit.

Remember, the key to successful implementation lies in correctly overriding the sort function and setting up your sort attributes array. With these steps, you can easily implement a custom sort with a secondary sort column in dgrid.

Keywords

• Dgrid
• Custom Sort
• Secondary Sort Column
• Data Science
• Dojo Toolkit
• JavaScript
• Data Manipulation
• Dgrid Sorting
• Sort Function
• Sort Attributes

Meta Description

Learn how to implement a dgrid custom sort with a secondary sort column. Enhance your data manipulation capabilities with this powerful feature of the Dojo toolkit. Perfect for data scientists working with JavaScript.

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