Click here to Skip to main content
Click here to Skip to main content
Go to top

Easy Grid Creation in JavaScript

, 25 Sep 2013
Rate this:
Please Sign up or sign in to vote.
How to create a grid in JavaScript

Statement of the Problem

We needed to create a grid. Grid must have multilevel headers. The whole grid looks like:

   -------------------------------
   |      |        Group          |
   | Num  |-----------------------|
   |      |  Date      |    Text  |
   |------------------------------|
   | 1    | 01.01.2000 | row 1    |
   | 2    | 17.03.2000 | row 2    |
   -------------------------------- 

For example, the types of data in the column must be:

  • number - for "num" column
  • date - for "date" column
  • text - for "text" column

Solution

We will use the AWeb library. The library allows you to create visual components, in this case this is grid. It is necessary to describe a header and data for the grid.

Method of Data Storage

When using the AWeb library, data is usually described as a tree structure. It does not matter whether there is nesting or not. List is a special kind of the tree. To create a list, you need to create the root element. Its' children describe list cells.

You can create a tree structure in 3 ways:

  1. By calling the constructor for the cell tree - AWeb.Utils.TreeNode
  2. Describing the tree in JSON format
  3. Describing the tree in XML format

Let us consider the second method. Trees can be named or not. In named trees, cell can be found by its name.

Named trees are described by the format:

{ name1 : { value : "value1", parentNode : "parent1" },
     ...
  nameN : { value : "valueN", parentNode : "parentN" }
}

In which:

  • name1-nameN - is a cell name
  • value - is a cell value
  • parentNode - is a parent cell name. Can be undefined.

Not named trees are described by nested arrays:

[ { value : "value1", children : [ ... ] },
     ...
  { value : "valueN", children : [ ... ] }
] 

In which:

  • value - is a cell name
  • children - contain nested cells. Can be undefined.

Grid Header

Grid header must be named. Let's describe a header from an example with JSON format.
One cell of the tree describes a single cell in header.

{ col_num : { value : "Num" },
  col_group : { value : "Group" },
  col_date : { value : "Date", parentNode : "col_group" },
  col_text : { value : "Text", parentNode : "col_group" }
} 

It is not necessary to describe the root cell of the tree.

Grid Data

Grid lines can be either named or not. Let's make them not named. One cell line describes the grid. The value of the cell must contain the name of the column and the values for these columns.

[{ value : { col_num : 1, col_date : new Date(2000,0,1), col_text : "row1" } },
 { value : { col_num : 2, col_date : new Date(2000,2,17), col_text : "row2" } }
] 

Grid and Data Types in Columns

Grid is created by using object AWeb.UI.Grid. It is possible to define grids' header and grids' data by functions AWeb.UI.Grid.loadCols and AWeb.UI.Grid.loadRows.

It's possible to define the column types by setting the property columnType for the selected column. In our example, the following types are used: "text", "date", "number".

The whole code is:

<!DOCTYPE HTML>
<html>
<head>
   <title>Sample project</title>
   
   <!-- Styles -->
   <link rel="stylesheet" type="text/css" href="http://a-web.me/styles/default/a-web.css" >
   
   <!-- Scripts -->
   <script type="text/javascript" src="http://a-web.me/scripts/a-web.js"></script>
</head>
<body>
   <script>
      function main() {
         var grid = new AWeb.UI.Grid()
            .loadCols({
               // Define columns
               col_num : { value : "Num" },
               col_group : { value : "Group" },
               col_date : { value : "Date", parentNode : "col_group" },
               col_text : { value : "Text", parentNode : "col_group" }
               
            }).loadRows([
               // Define rows
               { value : { col_num : 1, col_date : new Date(2000,0,1), col_text : "row1" } },
               { value : { col_num : 2, col_date : new Date(2000,2,17), col_text : "row2" } }
               
            ]).appendTo( document.body ).update();
         
         grid.columns['col_num'].columnType = "number";
         grid.columns['col_date'].columnType = "date";
         grid.columns['col_text'].columnType = "text";
         
         grid.bestFit();
      }
   </script>
</body>
</html> 

Other Articles About the Library

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Share

About the Author

Member 10277780
CEO student
Russian Federation Russian Federation
No Biography provided

Comments and Discussions

 
-- There are no messages in this forum --
| Advertise | Privacy | Mobile
Web04 | 2.8.140916.1 | Last Updated 25 Sep 2013
Article Copyright 2013 by Member 10277780
Everything else Copyright © CodeProject, 1999-2014
Terms of Service
Layout: fixed | fluid