Step 7 - Adding a default configuration

While all visualization container applications should be able to use any visualization, without them knowing each other, it is also true that one or the other can be provided with configurations that somehow improve their integration.

For example, if by the time that a visualization, V1 is developed, the application A1 is super-popular, and has a custom feature that is not part of the standard container application interface, the developer of V1 may package it a configuration module so that it better integrates with A1, out-of-the-box.

If you do not have any knowledge about JavaScript configuration in the Pentaho Platform, you might want to read Configuring a visualization before continuing.

Create the configuration module

Now, create a configuration file, called config.js, and place the following content in it:

define(["module"], function(module) {
  // Replace /config by /model.
  // e.g. "pentaho-visual-samples-bar-d3/model".
  var vizId = module.id.replace(/(\w+)$/, "model");

  return {
    rules: [
      // Sample rule
      {
        priority: -1,
        select: {
          type: vizId
        },
        apply: {
          props: {
            barSize: { defaultValue: 50 }
          }
        }
      }
    ]
  };
});

This configuration applies to the Bar visualization model type, in any application, has a lower-than-default-priority, and simply changes the default value of the barSize property to 50 pixels. For now, this only serves for us to prove that configuration actually works. We’ll use the Sandbox environment to make sure.

Register the configuration module in the sandbox

It is still necessary to register the configuration module with the configuration system. For such, edit the package.json file and add a pentaho/instanceInfo configuration so that your file looks like this:

{
  "name": "pentaho-visual-samples-bar-d3",
  "version": "0.0.1",

  "config": {
    "pentaho/typeInfo": {
      "pentaho-visual-samples-bar-d3/model": {
        "base": "pentaho/visual/base/model"
      }
    },
    "pentaho/instanceInfo": {
      "pentaho-visual-samples-bar-d3/config": {
        "type": "pentaho.config.spec.IRuleSet"
      }
    }
  },

  "dependencies": {
    "d3": "^4.11.0"
  },
  "bundleDependencies": [
    "d3"
  ],
  "devDependencies": {
    "@pentaho/viz-api": "https://github.com/pentaho/pentaho-platform-plugin-common-ui/releases/download/v3.0.0-beta2/pentaho-viz-api-v3.0.0.tgz"
  }
}

Note the modified config property.

Now, refresh the sandbox.html page in the browser, and you should see a Bar chart with wider bars. Go ahead and experiment with different values.

Analyzer Integration

In Analyzer, when drilling-down, the default behaviour is to add the child attribute to the visual role where the parent attribute is. However, the Category visual role of the Bar visualization you developed only accepts a single attribute being mapped to it. This results in Analyzer not allowing to drill-down.

However, it is possible to configure the Analyzer-specific metadata property, application.keepLevelOnDrilldown to force replacing the parent attribute with the child attribute when drilling-down. Add the following rule to the config.js file:

define(["module"], function(module) {
  // ...
  return {
    rules: [
      // ..,
      {
        priority: -1,
        select: {
          type: vizId,
          application: "pentaho-analyzer"
        },
        apply: {
          application: {
            keepLevelOnDrilldown: false
          }
        }
      }
    ]
  };
});

Again, note that this rule has no effect when testing your visualization in the sandbox environment, but is important if you package your visualization for deployment.

Continue to Next steps.