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getPrevSibling

Description​

Returns the id of the previous task of the same level

getPrevSibling: (id: string | number) => string | number

Parameters​

  • id - (required) string | number - the task id

Returns​

  • prevSibling - (string, number) - the id of the previous sibling

Example​

const tasks = {
  data:[
     {id:"p_1", text:"Project #1", start_date:"01-04-2013", duration:18, 
     open:true},
     {id:"t_1", text:"Task #1", start_date:"02-04-2013", duration:8,
     parent:"p_1"},
     {id:"t_2", text:"Task #2", start_date:"11-04-2013", duration:8,
     parent:"p_1"}
   ]
};
gantt.init("gantt_here");
gantt.parse(tasks);
 
gantt.getPrevSibling("t_2"); ->  "t_1" /*!*/
gantt.getPrevSibling("t_1"); ->  null (if no previous sibling) /*!*/