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SDSaranya Dhayalan Syncfusion Team October 18, 2019 06:40 AM UTC
Hi Abhishek,
Thank you for contacting Syncfusion support.
We have checked your code snippet, we think that you are using pure JavaScript based Gantt (EJ2-Gantt). To take the instance of the Gantt control, please use the below code snippets.
var ganttObj = document.getElementById('GanttContainer1').ej2_instances[0];
Kindly refer to the below documentation link to know more about EJ2 Gantt.