deliteful/ProgressIndicator

The deliteful/ProgressIndicator widget indicates that a task is ongoing. It displays a round spinning graphical representation. For a task whose end is determined, you can provide a number from 0 to 100 to indicate the level of progression.

Overview of the Progress Indicator by theme (bootstrap, iOS, Holodark)

ProgressIndicator Bootstrap ProgressIndicator iOS ProgressIndicator Holodark

Element Instantiation
Element Configuration
Element Styling
Enterprise Use
See also

Element Instantiation

See delite/Widget for full details on how instantiation lifecycle is working.

Declarative Instantiation

<html>
  <d-progress-indicator id="pi" active="true"></d-progress-indicator>
</html>

ProgressIndicator must be active to become visible and start its animation.

  require([
    "delite/register",
    "deliteful/ProgressIndicator"
  ], function (register) {
     register.parse();
     // perform some tasks...
     // then deactivate the progress indicator
     var pi = document.getElementById("pi");
     pi.active = false;
});

Programmatic Instantiation

  require([
    "delite/register",
    "deliteful/ProgressIndicator"
  ], function (register, ProgressIndicator) {

     var pi = new ProgressIndicator({active: true});
     pi.placeAt(document.body);

     register.parse();
     //do some other tasks (load data...)

     pi.active = false;
     pi.destroy(); //this instance won't be reused, so destroy it.
});

Element Configuration

The following properties can be set on the widget to configure it:

active: Set to false to hide the widget and stop any ongoing animation. Set to true to show the widget: animation automatically starts unless you set a number to the "value".
value: A value from 0 to 100 that indicates a percentage of progression of an ongoing task. Defaults to NaN.
speed: The relative speed of the spinning animation. Accepted values are "slow", "normal" and "fast". Other values are converted to "normal".

Determinate vs indeterminate

ProgressIndicator is indeterminate as long as ProgressIndicator.value = NaN, which is the default value. deliteful/ProgressIndicator is indeterminate in the sense that it doesn't indicate the level of completion of the ongoing task, it will spin until it is deactivated.

Animation speed

The speed attribute lets you change the relative speed of the animation. Accepted values are "slow", "normal" and "fast". Other values are converted to "normal". Note that the actual/real speed of the animation depends of the device/os/browser capabilities.

Element Styling

Supported themes

This widget provides default styling for the following delite themes:

bootstrap
ios
holodark

CSS Classes

Style is defined by the CSS classes from the themes of the widget. CSS classes are bound to the structure of the widget declared in its template deliteful/ProgressIndicator/ProgressIndicator.html

class name	applies to
d-progress-indicator	the ProgressIndicator widget node
d-progress-indicator text	the child node which contains the text to display when a value is set
d-progress-indicator-lines	the child node which declare the 12 lines of the ProgressIndicator

Customizing the colors

Here is an example that shows how to set the lines and the text in red:

<html>
  <d-progress-indicator id="pi"></d-progress-indicator>
</html>

#pi .d-progress-indicator-lines {
  stroke: red;
}
#pi.d-progress-indicator text {
  fill: red;
}

Customizing the size

Default widget size is 40x40px on all themes. You may use width and height standard CSS properties to specify the size. We recommend that you keep width and height equal (or close) in order to get nicer results.

Example of ProgressIndicator which fills its container

<d-progress-indicator style="width: 100%; height: 100%"></d-progress-indicator>

Note the the text size automatically stretch/expand itself, so you do not have to set/change the font size.

Enterprise Use

Accessibility

type	status	comment
Keyboard	N/A	No user interaction
Visual Formatting	ok	Support high contrast on Firefox and Internet Explorer desktop browsers.
Screen Reader	no	There is no ARIA role for progress indicator, for long running tasks that require sounds feedback, consider using `deliteful/ProgressBar`

Browser Support

This widget supports all supported browsers without any degraded behavior.