本文给大家讲解在使用DHTMLX Gantt时，如何自定义第三方持续时间控制，欢迎大家下载最新版试用体验。

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您需要向lightbox添加一个自定义Duration控件，以指定任务的开始日期和天数。

如何在jQuery的基础上添加一个自定义的Duration控件:

在页面中包含jQuery库的源文件:

<script src="https://code.jquery.com/jquery-3.5.1.min.js"></script>
<script src="https://code.jquery.com/ui/1.12.1/jquery-ui.min.js"></script>
<link  rel="stylesheet" type="text/css" 
    href="https://code.jquery.com/ui/1.12.1/themes/base/jquery-ui.css">

描述控制逻辑:

(function () {
    function startDatepicker(node){
        return $(node).find("input[name='start']");
    }
    function durationInput(node){
        return $(node).find("input[name='duration']");
    }
    function endDateLabel(node){
        return $(node).find("span.gantt-lb-datepicker-label");
    }
 
    var formatter = gantt.ext.formatters.durationFormatter({
        enter: "day",
        store: "day",
        format: "auto"
    });
 
    gantt.form_blocks["datepicker_duration"] = {
        render: function (sns) { //sns - the section's configuration object
            return "<div class='gantt-lb-datepicker'>"+
                "<label>Start:<input type='text' name='start'></label>"+
                "<label>Duration: <input type='text' name='duration'></label>"+
                "<span class='gantt-lb-datepicker-label'></span>"
                "</div>";
        },
        set_value: function (node, value, task, section) {
            //node - an html object related to the html defined above
            //value - a value defined by the map_to property
            //task - the task object
            //section- the section's configuration object
 
            startDatepicker(node).datepicker({
                dateFormat: "yy-mm-dd",
                onSelect: function (dateStr) {
                    var endValue = durationInput(node).datepicker('getDate');
                    var startValue = startDatepicker(node).datepicker('getDate');
 
                    if(startValue && endValue){
                        if(endValue.valueOf() <= startValue.valueOf()){
                            durationInput(node).datepicker("setDate",
                                gantt.calculateEndDate({
                                    start_date: startValue, duration: 1, task:task
                                })
                            );
                        }
                    }
                }
            });
 
            startDatepicker(node).datepicker("setDate", task.start_date);
 
            durationInput(node).val(formatter.format(task.duration));
            endDateLabel(node).text(
                "Ends: " + gantt.templates.task_date(task.end_date)
            );
        },
        get_value: function (node, task, section) {
 
            if(task.start_date && task.end_date) {
                var start = startDatepicker(node).datepicker('getDate');
                var end = task.end_date;
                var duration = formatter.parse(durationInput(node).val());
 
                if(duration && !isNaN(Number(duration))){
                    end = gantt.calculateEndDate({
                        start_date: start, duration: duration, task:task
                    });
                }
                task.start_date = start;
                task.duration = duration;
                task.end_date = end;
            }
 
            task.duration = gantt.calculateDuration(task);
            return {
                start_date: task.start_date,
                end_date: task.end_date,
                duration: task.duration
            }
        },
        focus: function (node) {
 
        }
    }
})();

将该控件作为类型为"datepicker_duration"的灯箱部分使用:

gantt.config.lightbox.sections = [
  { name: "description", height: 70, map_to: "text", type: "textarea", focus: true },
  { name: "time", height: 72, map_to: "auto", type: "datepicker_duration" }
];

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