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Vizlib Gantt | Data Model Requirements

Vizlib Gantt is a 100% data-driven solution leveraging Qlik's powerful associative data engine. To use Vizlib Gantt on top of your own data model, you must ensure some prerequisites are met, and certain dimension fields are available in your Qlik Sense app.


Building the Chart

Build your own Vizlib Gantt-ready load script:

   date(floor((today() - (ParentGroupNum*20 * (rand()) )))) as StartDate,
   date(floor((today() + (ParentGroupNum*20 * (rand()) )))) as EndDate,
   * ;
 'Event ' & ID as Event,
  Pick(Ceil(3*Rand1),'1','2','3') as ParentGroupNum,
 Pick(Ceil(3*Rand1),'A','B','C') as ParentGroup,
 Pick(Ceil(6*Rand1),'a','b','c','d','e','f') as Group,
 Pick(Ceil(3*Rand()),'X','Y','Z') as SubGroup,
 rand() *1000 as Cost,
 Pick(Ceil(3*Rand()),'Jo','Jack','Jill') as Resource,
* ;
 Rand()  as Rand1,
 Rand()*5  as RandWhole,
 IterNo() as LineID,
 RecNo() as ID
Autogenerate 100 While Rand()<=0.5 or IterNo()=1;

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Data Model Definition

The key fields which Vizlib Gantt can read include:

Field NameSupported TypesDescriptionNeededField Name
in example file
[Events]$text, $ascii, $numeric, $integerThis is the unique identifier or name of the event, project, or task. This field represents the main driver of the Gantt.Required[Event]
[Start Date]$timestamp, $dateThis field defines the start date of the event, task or project. Required[Start Date]
[End Date]$timestamp,
This field defines the end date of an event, task or project. If omitted, events will not expand over a timeline and will appear as static single-day eventsOptional[End Date]
[Group]$text, $ascii, $numeric, $integerThis field organizes events, projects or tasks into a hierarchical group. Groups can be expanded or collapsed, just like in a pivot table, and individual events are aggregated to a group view.Optional[Phase]
[Sub Group]$text, $ascii, $numeric, $integerThis field allows you to create a multi-level hierarchy and works in exactly the same way as the [Group] field. Sub Groups are organized at one level below the [Group] field.Optional[Group]
[Parent Group]$text, $ascii, $numeric, $integerThis field allows you to create a multi-level hierarchy and works in exactly the same way as the [Group] field. Parent Groups are organized at one level above the [Group] field.Optional[Plan Type]
[Event Type]"event" or "milestone"The Vizlib Gantt supports different representation types such as events or milestones. This can be driven dynamically by defining the type in the [Event Type] field. At the moment there are only two types supported, and more will be introduced in due course.OptionalQlik expression
[Predecessor]$numericUsing Predecessors in the Vizlib Gantt to create dependencies. You must have the [Events] defined as the order number so that we can draw the dependent links.Optional
[Plan Type]

Further to the above fields, you can dynamically define many more settings or properties via expressions, such as the background colors for each event. Those expressions can be variables, calculations or even simple dimension values.

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Vizlib Gantt Example

Below (Figure 1) is an example of a Vizlib Gantt.

The example is using the data provided at the bottom of the page. 

Figure 1: Vizlib Gantt example

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Example Dataset

Please find the attached datasets at the bottom of the page.

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Luke is the author of this solution article.

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