Auto set start date based on predecessor

Gantt
#1

Hi,

We are using DHTMLX Gantt with Angular and we need to auto adjust start date of a task, based on the predecessor of the task.

Ex:

Consider that there are two tasks as follows.

1 Task A: 12/05/2022 - 18/05/2022

2 Task B: 23/05/2022 - 30/05/2022

If the user adds 1 against the predecessor field in 2nd task, then the system will adjust the start date of Task B based on the constraint that is set for the task.

  1. If the constraint for Task B is set as Start No Earlier Than 23/05/2022, then the system will not update the start date of that task when the user adds a predecessor to it.

  2. If there are no constraints of Task B, then the system will update the start date of the task B to 19/05/2022 (next available date after the end date of Task A).

Is there anyway to configure this in DHTMLX Gantt.

Thank you.

Kind regards,
Madhuka Lakshan.

#2

Hello,
There is auto_scheduling extension that gives Gantt the ability to schedule tasks automatically depending on relations between them:
https://docs.dhtmlx.com/gantt/desktop__auto_scheduling.html ;
Gantt provides the possibility to set additional time constraints for tasks:
https://docs.dhtmlx.com/gantt/desktop__auto_scheduling.html#timeconstraintsfortasks ;
Gantt has several types of time constraints, and one of them is exactly what you want: Start no earlier than – the task should start on the specified date or after it.
Please check the example with all types of constraints in Gantt:
https://docs.dhtmlx.com/gantt/samples/02_extensions/19_constraints_scheduling.html ;
And here is the demo of how it might be implemented in angular (choose the required constraint type for the tasks and create link):
https://files.dhtmlx.com/30d/941b60293f83a48a96874ab367586956/angular13+constraint_types.zip ;
If you want auto-planning to work based on task dates and relations only, ignoring constraints, you can use gantt.config.auto_scheduling_compatibility config with true value.
Here related article:
https://docs.dhtmlx.com/gantt/api__gantt_auto_scheduling_compatibility_config.html

#3

Thank you Артём for the reply.

#4

Hello,
The dev team added the feature to display Constraints in Gantt in you use the constraint scheduling mode:
https://docs.dhtmlx.com/gantt/desktop__inbuilt_baselines.html#taskconstraints

https://docs.dhtmlx.com/gantt/whatsnew.html#x8318x90x8319x

You can see how it works in the following samples:
https://docs.dhtmlx.com/gantt/samples/02_extensions/19_constraints_scheduling.html

https://docs.dhtmlx.com/gantt/samples/02_extensions/20_backwards_scheduling.html

https://snippet.dhtmlx.com/j9dli98b