Initializing help system before first use

# JS API and VDL Objects

The information in this topic includes summary data and execution status for JS API and VDL Objects.

## Summary Data and Execution Status

The `ScenarioSummaryData` object contains information that is available at the beginning or after the job execution. It is not updating during execution. For information concerning execution the `ScenarioExecutionStatus` object is mostly used.

View developers can query the execution mode in order to apply conditional logic on the view.

    =scenario.summaryData.executionMode.name

It is possible to discover which execution modes can send progress.

    =scenario.executionStatus.executionMode.sendsProgress

It is possible to implement conditional logic based on execution state, to render a view differently depending on whether scenarios are executing or not.

    <vdl-section vdl-if = "=scenario.executionStatus.executing"></vdl-section>

View developers can implement conditional logic based on execution state, so that I can render a view differently depending on whether scenarios are executing or not. For example, an overlay can be applied if the scenario is queued.

    <vdl-overlay vdl-if="=scenario.executionStatus.queued">
     <vdl-include src="my-overlay.vdl">
    </vdl-overlay>

Similarly, a VDL var can be associated with the execution status and display a modal dialog if the scenario is queued.

    <vdl-var name="isQueued" value="=scenario.executionStatus.queued" vdl-event="value-changed:actions.toggleModal">

Covered Topics

- Replacing the Default Overlay
  The functionality covered so far in this chapter enables view developers to create their own custom execution overlay.
- Using the Standard VDL Components with Progress Updates
  Once the view can display custom VDL during execution, it is possible to also use other VDL components that will display useful information about model progress.
- Using VDL Actions to Send Messages to the Model
  To halt the scenario (job) execution a Action should be triggered.

Parent Topic Preparing a View for Progress Updates

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