getPrevSibling

获取同一级别中前一个任务的 id

string| number getPrevSibling(string | number id);
idstring | number任务的 id
string| number前一个兄弟任务的 id

Example

const tasks = {
  data:[
     {id:"p_1", text:"项目 #1", start_date:"01-04-2013", duration:18, 
     open:true},
     {id:"t_1", text:"任务 #1", start_date:"02-04-2013", duration:8,
     parent:"p_1"},
     {id:"t_2", text:"任务 #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 (如果没有前一个兄弟任务)

See also
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