Dojo's Industrial-Strength Grid Widget

Dojo's grid widget provides a fierce alternative to the paginated table that has become such a mainstay of modern-day Web application interfaces.
Server-Backed Data

So far, the examples demonstrated here are using ItemFileReadStore or ItemFileWriteStore, which necessarily implies that your data set is small enough that it's practical to load it into the client. In other words, we've been dodging the issue of having such a large data set (say, millions of records) that it can't all be loaded into the client. Let's put together a final example that demonstrates the grid at work using a server-backed store, such as the The markup for defining the DataGrid should look familiar enough. Note that because the QueryReadStore implements only the Read and Identity APIs, trying to make cells editable would have no effect. It's totally possible, however, to extend the QueryReadStore with Write and Notification support or attach a store, such as the, that implements all four APIs to produce an editable interface:

<body class="tundra">
  <!--Fetch data from a store as usual.
      This time, it just happens to be a QueryReadStore -->
  <span dojoType=""

  <!-- Define the grid directly in markup and allow the parser
       to take care of the rest -->
  <table id="gridNode"
         dojoType="dojox.grid.DataGrid" store="gridStore">
        <th width="50%" field="id">ID</th>
        <th width="50%" field="label">Label</th>

To try out the example, however, you need a basic server implementation that returns pages of data whenever the QueryReadStore requests them. A minimalistic server written in CherryPy is shown in Listing 4.

Figure 5. Given a server-backed store, the DataGrid can render arbitrary numbers of rows—all without pagination!



Comment viewing options

Select your preferred way to display the comments and click "Save settings" to activate your changes.

Excellent article

siva's picture

Excellent article .

One Click, Universal Protection: Implementing Centralized Security Policies on Linux Systems

As Linux continues to play an ever increasing role in corporate data centers and institutions, ensuring the integrity and protection of these systems must be a priority. With 60% of the world's websites and an increasing share of organization's mission-critical workloads running on Linux, failing to stop malware and other advanced threats on Linux can increasingly impact an organization's reputation and bottom line.

Learn More

Sponsored by Bit9

Linux Backup and Recovery Webinar

Most companies incorporate backup procedures for critical data, which can be restored quickly if a loss occurs. However, fewer companies are prepared for catastrophic system failures, in which they lose all data, the entire operating system, applications, settings, patches and more, reducing their system(s) to “bare metal.” After all, before data can be restored to a system, there must be a system to restore it to.

In this one hour webinar, learn how to enhance your existing backup strategies for better disaster recovery preparedness using Storix System Backup Administrator (SBAdmin), a highly flexible bare-metal recovery solution for UNIX and Linux systems.

Learn More

Sponsored by Storix