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开始指南配置时间轴

缩放功能

dhtmlxGantt 内置了一个模块，使时间轴缩放的管理变得简单。如果你希望调整默认的缩放行为，可以使用灵活的 API，动态更改时间轴设置。

内置缩放模块

集成的缩放模块属于 gantt.ext.zoom 扩展。要启用它，只需调用 gantt.ext.zoom.init(zoomConfig) 并传入包含缩放级别数组的 zoomConfig 对象。例如：

var zoomConfig = {
    levels: [
      {
        name:"day",
        scale_height: 27,
        min_column_width:80,
        scales:[
            {unit: "day", step: 1, format: "%d %M"}
        ]
      },
      {
         name:"week",
         scale_height: 50,
         min_column_width:50,
         scales:[
          {unit: "week", step: 1, format: function (date) {
           var dateToStr = gantt.date.date_to_str("%d %M");
           var endDate = gantt.date.add(date, 6, "day");
           var weekNum = gantt.date.date_to_str("%W")(date);
           return "#" + weekNum + ", " + dateToStr(date) + " - " + dateToStr(endDate);
           }},
           {unit: "day", step: 1, format: "%j %D"}
         ]
       },
       {
         name:"month",
         scale_height: 50,
         min_column_width:120,
         scales:[
            {unit: "month", format: "%F, %Y"},
            {unit: "week", format: "Week #%W"}
         ]
        },
        {
         name:"quarter",
         height: 50,
         min_column_width:90,
         scales:[
          {unit: "month", step: 1, format: "%M"},
          {
           unit: "quarter", step: 1, format: function (date) {
            var dateToStr = gantt.date.date_to_str("%M");
            var endDate = gantt.date.add(gantt.date.add(date, 3, "month"), -1, "day");
            return dateToStr(date) + " - " + dateToStr(endDate);
           }
         }
        ]},
        {
          name:"year",
          scale_height: 50,
          min_column_width: 30,
          scales:[
            {unit: "year", step: 1, format: "%Y"}
        ]}
    ]
};
 
gantt.ext.zoom.init(zoomConfig);

有关缩放模块及其 API 的详细信息，请参阅文章 Zoom 扩展。

Related sample:  Mouse wheel zoom

自定义缩放设置

如果你不想使用缩放模块，而是希望自行控制时间轴设置，只需调整相关的配置项即可。

通常，实现缩放功能意味着为时间轴定义几个预设（缩放级别），并允许用户在它们之间切换。

以下是配置时间轴所需的设置：

下面是一些预设的示例：

/* global gantt */
function setScaleConfig(level) {
    switch (level) {
        case "day":
            gantt.config.scales = [
                {unit: "day", step: 1, format: "%d %M"}
            ];
            gantt.config.scale_height = 27;
            break;
        case "week":
            var weekScaleTemplate = function (date) {
              var dateToStr = gantt.date.date_to_str("%d %M");
              var endDate = gantt.date.add(gantt.date.add(date, 1, "week"), -1, "day");
              return dateToStr(date) + " - " + dateToStr(endDate);
            };
            gantt.config.scales = [
                {unit: "week", step: 1, format: weekScaleTemplate},
                {unit: "day", step: 1, format: "%D"}
            ];
            gantt.config.scale_height = 50;
            break;
        case "month":
            gantt.config.scales = [
                {unit: "month", step: 1, format: "%F, %Y"},
                {unit: "day", step: 1, format: "%j, %D"}
            ];
            gantt.config.scale_height = 50;
            break;
        case "year":
            gantt.config.scales = [
                {unit: "year", step: 1, format: "%Y"},
                {unit: "month", step: 1, format: "%M"}
            ];
            gantt.config.scale_height = 90;
            break;
    }
}

该函数为 gantt 对象设置了四种预定义配置之一，从“天”到“年”级别。要应用更改，需要完全重绘甘特图：

setScaleConfig("year");
gantt.init("gantt_here");

你可以创建一个简单的界面，让用户切换缩放级别：

<label><input type="radio" name="scale" value="day" checked/>Day scale</label>
<label><input type="radio" name="scale" value="week"/>Week scale</label>
<label><input type="radio" name="scale" value="month"/>Month scale</label>
<label><input type="radio" name="scale" value="year"/>Year scale</label>


var els = document.querySelectorAll("input[name='scale']");
for (var i = 0; i < els.length; i++) {
    els[i].onclick = function(e){
        var el = e.target;
        var value = el.value;
        setScaleConfig(value);
        gantt.render();
    };
}

Related sample:  Dynamic scales

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