Labels

Overview

Some elements have labels – text or image components, which are defined as instances of the anychart.core.ui.LabelsFactory class.

Labels are supported by the following elements of the Project chart:

Also, labels are supported by the main element of the Resource chartperiod.

To access labels, call the labels() method of a particular element type or of all elements (of course, only the elements that support labels are affected):

// access labels of tasks
var labels = chart.getTimeline().tasks().labels();
// access labels of elements
var labels = chart.getTimeline().elements().labels();

By default, labels are enabled on Project charts and disabled on Resource charts. To enable or disable labels, pass true / false either directly to labels() or to the enabled() method of labels:

// disable labels of tasks
var chart.getTimeline().tasks().labels(false);
// disable labels of tasks
chart.getTimeline().tasks().labels().enabled(false);

To configure labels, use other methods of anychart.core.ui.LabelsFactory – for example, fontColor(), fontWeight(), fontSize(), etc. The format() method, combined with text formatters, allows setting the text format – read the sections below to learn more.

Note: To learn more about formatting dates, see Date and Time Formats: format().

Tokens

To format the text of labels, combine the format() method with tokens.

Please keep in mind that in addition to default tokens you can always use a custom token corresponding to a custom field in your data.

Also, if you need to enable HTML in tokens, pass true to useHtml().

Project Tokens

For the Project chart, the following tokens are available:

  • {%id}
  • {%name}
  • {%actualStart}
  • {%actualEnd}
  • {%baselineStart}
  • {%baselineEnd}
  • {%progress}
  • {%linearIndex}

In the sample below, labels of different elements have the same font weight but different text format, which is configured with the help of tokens, including a custom one:

// access the timeline
var timeline = chart.getTimeline();

// configure labels of tasks
timeline.tasks().labels().useHtml(true);
timeline.tasks().labels().format(
  "– <span style='color:#64b5f6'>{%progress}</span>"
);

// configure labels of parent tasks
timeline.groupingTasks().labels().useHtml(true);
timeline.groupingTasks().labels().format(
    "– <span style='color:#dd2c00'>{%progress}</span>"
);

// configure labels of milestones
timeline.milestones().labels().useHtml(true);
timeline.milestones().labels().format(
    "<span style='color:#ffa000'> " +
    "{%actualStart}{dateTimeFormat:dd MMM}</span> {%custom_field}"
);

Playground

Resource Tokens

The Resource chart supports these tokens:

  • {%id}
  • {%name}
  • {%start}
  • {%end}
  • {%linearIndex}

In the following sample, tokens, including a custom one, are used to format the text of period labels. Also, the text font is adjusted.

// configure labels of periods
var periodLabels = chart.getTimeline().periods().labels();
periodLabels.enabled(true);
periodLabels.useHtml(true);
periodLabels.fontColor("#104d89");
periodLabels.fontWeight(600);
periodLabels.format(
  "<span style='color:#991f00'>{%custom_field}</span> " +
  "start: {%start}{dateTimeFormat:dd MMM}"
);

Playground

Formatting Functions

You can configure the text of labels by combining the format() method with formatting functions.

In these functions, a number of default context fields is available. Also, you can use getData() to refer to a custom field in your data and methods of the tree data model to perform operations on data.

If you need to enable HTML in formatting functions, pass true to useHtml().

Project Fields

For the Project chart, the following fields are available in formatting functions:

  • id
  • name
  • actualStart
  • actualEnd
  • baselineStart
  • baselineEnd
  • progress
  • linearIndex

In the sample below, labels of different elements have the same font weight but different text format, which is configured with the help of formatting functions.

The label of the milestone refers to another task – its id is linked in a custom data field. The getData() method is used to get the id, and the search() and get() methods of the Tree Data Model are used to find the task and get its name.

// access the timeline
var timeline = chart.getTimeline();

// configure labels of tasks
timeline.tasks().labels().useHtml(true);
timeline.tasks().labels().format(function() {
  if (this.progress == 1) {
    return "<span style='color:#64b5f6'>COMPLETE</span>";
  } else {
    return "<span style='color:#64b5f6'>" +
           this.progress * 100 + "</span>%";
  }
});

// configure labels of parent tasks
timeline.groupingTasks().labels().useHtml(true);
timeline.groupingTasks().labels().format(function() {
  var duration = (this.actualEnd - this.actualStart) / 1000 / 3600 / 24;
  return "<span style='color:#dd2c00'>" + 
         duration + "</span>d";
});

// configure labels of milestones
timeline.milestones().labels().useHtml(true);
timeline.milestones().labels().format(function() {
  var relatedTaskId = this.getData("custom_field");
  var relatedTaskItem = treeData.search("id", relatedTaskId);
  var relatedTaskName = relatedTaskItem.get("name");
  return "<span style='color:#ffa000'>Review:</span> " +
         relatedTaskName;
});

Playground

Resource Fields

Here are the fields supported by the Resource chart:

  • id
  • name
  • start
  • end
  • linearIndex

In this sample, a formatting function is used to display the duration of each period as well as the value of a custom field:

// configure labels of periods
var periodLabels = chart.getTimeline().periods().labels();
periodLabels.enabled(true);
periodLabels.useHtml(true);
periodLabels.fontColor("#104d89");
periodLabels.fontWeight(600);
periodLabels.format(function() {
  var duration = (this.end - this.start) / 1000 / 3600 / 24;
  if (duration > 30) {
    return "<span style='color:#991f00'>" + this.getData("custom_field") +
           " " + duration + " days</span>"
  } else {  
    return this.getData("custom_field") + " " + duration + " days";
  }
});

Playground