Gantt demo for SalesForce

Here you can find a code example of the Gantt chart for Lightning Web Components on Salesforce Platform.

The sample is implemented with the help of JavaScript Gantt chart library - DHTMLX Gantt.

Prerequisites

Enable the Developer Hub in your organization
Install the Salesforce CLI

How to start

Change login url (sfdcLoginUrl) in sfdx-project.json to url of your SalesForce organization
Create scratch org

sfdx org login web -d
sfdx org create scratch -f config/project-scratch-def.json -d

Publish code

sfdx project deploy start
sfdx data import tree -f ./data/GanttTask__c.json

Open scratch org in browser

sfdx org open

Create custom tab with Gantt

The scratch org already has Gantt app which you can check, or go to "Setup : Lighting Apps", create a new Lighting App and drop the Gantt from the list of available components: https://docs.dhtmlx.com/gantt/desktop__howtostart_salesforce.html#step7creatinglightningpage

Open the tab with Gantt by choosing it from the App Launcher

How to configure / modify

Backend

getTasks in force-app/main/default/classes/GanttData.cls returns list of tasks and links, adjust this query as necessary.

Frontend

force-app/main/default/lwc/gantt/gantt.js contains code of web component

function unwrap(fromSF){
    const data = fromSF.tasks.map(a => ({

unwrap functions controls how data from SalesForce is converted to Gantt compatible objects. You will need to modify this code if you will want to provide some additional data properties from SalesForce to the Gantt

initializeUI(){
        const root = this.template.querySelector('.thegantt');
        root.style.height = this.height + "px";

        const gantt = window.Gantt.getGanttInstance();

initializeUI creates an instance of gantt. This is the perfect place to configure gantt by using its API

gantt.createDataProcessor({
            task: {

createDataProcessor defines data saving rules, they need to be adjusted if you will want to save some extra fields along with the default Task's data.

Version of the Gantt

force-app/main/default/staticresources/dhtmlxgantt7111.zip contains a trial version of the Gantt ( it will show a warning message time to time ). For production usage you will need to replace js and css files in this archive with ones from enterprise/ultimate Gantt package.

Related resources

Documentation: https://docs.dhtmlx.com/gantt/
dhtmlxGantt product page: https://dhtmlx.com/docs/products/dhtmlxGantt/
Video tutorial: https://youtu.be/1nXl9jfMdto
About DHTMLX Gantt in Salesforce: https://dhtmlx.com/docs/products/demoApps/salesforce-gantt-chart/

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DHTMLX/salesforce-gantt-demo