getPrev

获取前一个项目的id，无论其嵌套层级如何——无论是在同一层级还是不同层级。

id

string | number

任务的id

string| number

指定任务之前的任务id

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.getPrev("p_1"); ->  null gantt.getPrev("t_1"); -> "p_1" gantt.getPrev("t_2"); -> "t_1"

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