I am using the DHTMLX Gantt chart, Here I need to get the starting plotted date and ending plotted date from the Gantt. For example here start date is 31 Mar 2019 and the end Date is 7 Apr 2019 in the chart, I want this date without taking it from the JSON. Actually, I want to add some more days to the start date and end date that’s why I need it. Here is the code below.
HTML
<!DOCTYPE html>
<html>
<head>
<link rel='stylesheet' type='text/css' href='http://cdn.dhtmlx.com/gantt/edge/dhtmlxgantt.css'>
<script src='http://cdn.dhtmlx.com/gantt/edge/dhtmlxgantt.js'></script>
<style>
.gantt_custom_button {
background-color: rgb(206, 206, 206);
position: absolute;
right: -10px;
top: 5px;
width: 20px;
height: 26px;
border-radius: 0;
}
</style>
</head>
<div id='gantt_here' style='width:100%; height:500px;'></div>
<body>
<script>
var task1 = {
'data': [{
'id': 1,
'text': 'Project #1',
'start_date': '01-04-2019',
'duration': 2,
'order': 10,
'progress': 0.4,
'open': true
},
{
'id': 2,
'text': 'Task #1',
'start_date': '02-04-2019',
'duration': 1,
'order': 10,
'progress': 0.6,
'parent': 1
},
{
'id': 3,
'text': 'Task #2',
'start_date': '03-04-2019',
'duration': 2,
'order': 20,
'progress': 0.6,
'parent': 1
},
{
'id': 4,
'text': 'Task #3',
'start_date': '05-04-2019',
'duration': 1,
'order': 10,
'progress': 0.6,
'parent': 1
}
],
'links': [{
'id': 1,
'source': 1,
'target': 2,
'type': '1'
},
{
'id': 2,
'source': 2,
'target': 3,
'type': '0'
},
{
'id': 3,
'source': 3,
'target': 4,
'type': '0'
},
{
'id': 4,
'source': 2,
'target': 5,
'type': '2'
}
]
};
//console.log(task1.data)
task1.data.forEach(function (val, index) {
console.log(val.start_date);
//gantt.config.start_date = gantt.date.add(new Date(val.start_date), -2, 'month');
// gantt.config.end_date = gantt.date.add(new Date(val.start_date), 2, 'month');
})
// gantt.config.start_date = gantt.date.add(new Date(2019, 02, 31), -1, 'month');
// gantt.config.end_date = gantt.date.add(new Date(2019, 03, 8), 1, 'month');;
gantt.config['scales'] = [{
unit: 'day',
step: 1,
format: '%d %M'
},
{ unit: "year", step: 1, format: "%Y" },
{ unit: "month", step: 1, format: "%M" }
];
gantt.config.scale_height = 100;
gantt.init('gantt_here');
gantt.parse(task1);
</script>
</html>
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Answer
There is an API called getState() for that if you want the starting date and ending date from the Gantt chart.
gantt.getState().min_date will give you the date that tasks are displayed in the chart from and gantt.getState().max_date will give you the date that tasks are displayed in the chart till. If you want a date before or after the starting date or ending date, you can add/subtract the number of days according to your need by this gantt.date.add(new Date(gantt.getState().max_date), -1, 'day'). Here is the working example:
<!DOCTYPE html>
<html>
<head>
<link rel='stylesheet' type='text/css' href='http://cdn.dhtmlx.com/gantt/edge/dhtmlxgantt.css'>
<script src='http://cdn.dhtmlx.com/gantt/edge/dhtmlxgantt.js'></script>
<style>
.gantt_custom_button {
background-color: rgb(206, 206, 206);
position: absolute;
right: -10px;
top: 5px;
width: 20px;
height: 26px;
border-radius: 0;
}
</style>
</head>
<div id='gantt_here' style='width:100%; height:500px;'></div>
<body>
<script>
var task1 = {
'data': [{
'id': 1,
'text': 'Project #1',
'start_date': '01-04-2019',
'duration': 2,
'order': 10,
'progress': 0.4,
'open': true
},
{
'id': 2,
'text': 'Task #1',
'start_date': '02-04-2019',
'duration': 1,
'order': 10,
'progress': 0.6,
'parent': 1
},
{
'id': 3,
'text': 'Task #2',
'start_date': '03-04-2019',
'duration': 2,
'order': 20,
'progress': 0.6,
'parent': 1
},
{
'id': 4,
'text': 'Task #3',
'start_date': '05-04-2019',
'duration': 1,
'order': 10,
'progress': 0.6,
'parent': 1
}
],
'links': [{
'id': 1,
'source': 1,
'target': 2,
'type': '1'
},
{
'id': 2,
'source': 2,
'target': 3,
'type': '0'
},
{
'id': 3,
'source': 3,
'target': 4,
'type': '0'
},
{
'id': 4,
'source': 2,
'target': 5,
'type': '2'
}
]
};
//console.log(task1.data)
task1.data.forEach(function (val, index) {
// console.log(val.start_date);
//gantt.config.start_date = gantt.date.add(new Date(val.start_date), -2, 'month');
// gantt.config.end_date = gantt.date.add(new Date(val.start_date), 2, 'month');
})
// gantt.config.start_date = gantt.date.add(new Date(2019, 02, 31), -1, 'month');
// gantt.config.end_date = gantt.date.add(new Date(2019, 03, 8), 1, 'month');;
gantt.config['scales'] = [{
unit: 'day',
step: 1,
format: '%d %M'
},
{ unit: "year", step: 1, format: "%Y" },
{ unit: "month", step: 1, format: "%M" }
];
gantt.config.scale_height = 100;
gantt.init('gantt_here');
gantt.parse(task1);
console.log(gantt.getState().min_date);
console.log(gantt.getState().max_date);
console.log("Your custom date");
console.log(gantt.date.add(new Date(gantt.getState().min_date), 1, 'day'));
console.log(gantt.date.add(new Date(gantt.getState().max_date), -1, 'day'));
</script>
</html>