getPrev

Description

返回前一个项的 id（无论嵌套层级是相同还是不同）

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

Parameters

• id - (required) string | number - 任务 id

Returns

• id - (string, number) - 前一个任务的 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"  /*!*/

Related API

• getNext
• getParent
• hasChild
• getChildren
• getSiblings
• getNextSibling
• getPrevSibling

Related Guides

• 任务父子关系