Stepper

The stepper control lets the user adjust a value by increasing and decreasing it in small steps. Steppers are used in situations where a user needs to adjust a value by a small amount.

Basic Usage

The following example will render a simple Stepper with a label.

<label>
    <input mbsc-stepper data-label="The label of the stepper" />
</label>

For being more informative a description and a color can also be passed to the switch.

<!-- Label and description for more info -->
<label>
    <input mbsc-stepper data-label="Childrens" data-description="Number of childrens." />
</label>

<!-- Different color steppers -->
<label>
    <input mbsc-stepper data-color="danger" data-label="Danger" />
</label>
<label>
    <input mbsc-stepper color="info" label="Info" />
</label>

Auto initialization

If the component is added later to the DOM, e.g. with an Ajax page load, a custom function named enhance needs to be called in order to initialize the dynamically added component. When the enhance function is called on a DOM element, all form elements will be initialized inside this element.

$.get('/myform', function (responseHtml) {
    var $page = $('#page');
    $page.html(responseHtml);
    mobiscroll.enhance($page[0]);
});

Passing options

All the options can be passed to the stepper via data- attributes with exceptions of the native input supported ones. The attributes that the native html input supports can be passed directly without the data- prefix. For example thevalue or the disabled attributes (and so on...).

In this example we pass the rtl and the disabled options:

<label>
    <input mbsc-stepper data-rtl="true" value="10" disabled data-label="This is Disabled" />
</label>

Change value programmatically

<label>
    <input id="my-stepper" value="5" mbsc-stepper data-label="Stepper value change" />
</label>

// get the input element, the stepper was initialized on
const inputElement = $('#my-stepper');
// get the instance of the stepper component
const stepperInstance = mobiscroll.getInst(inputElement);

const changeValueState = stepperInstance.value; // get the value as a number value
stepperInstance.value = 15; // will change the stepper value

Disabled state

The underlying input's disabled attribute will be taken into account at initialization time. For example:

<!-- This will create a disabled stepper -->
<label>
    <input disabled mbsc-stepper data-label="Initially disabled" />
</label>

<!-- The following will not be disabled -->
<label>
    <input mbsc-stepper data-label="Initially not disabled" />
</label>

Changing options dynamically

The options of the stepper can be changed dynamically using the setOptions method on the instance itself, or the global setOptions method.
Here is an example on how to change the disabled option on stepper:

<label>
    <input id="my-stepper" disabled mbsc-stepper data-label="My stepper" />
</label>

// get the input element, the stepper was initialized on
const inputElement = $('#my-stepper');
// get the instance of the stepper component
const stepperInstance = mobiscroll.getInst(inputElement);

// set the disabled setting to false
stepperInstance.setOptions({ disabled: false });

Options

Customizing the appearance

While the provided pre-built themes are enough in many use cases, most of the times on top of adapting to a specific platform, you'd also like to match a brand or color scheme. Mobiscroll provides various ways to achieve this:

• Create custom themes using the theme builder - the custom themes can be also built using out theme builder, on a graphical user interface, without any coding, or the need for Sass support in your project.
• Create custom themes using Sass - use this, if you need multiple themes with different color variatons, in case you have pages with different colors, or you'd like to users to customize the colors of your app.
• Override the Sass color variables - the straightforward way to change the colors in one place throughout the application.

Override the Sass Color Variables

A convenient way to customize the colors of the Mobiscroll components is to override the Sass color variables.

Let's say your branding uses a nice red accent color, and you'd like that color to appear on the Mobiscroll components as well, while still using platform specific themes (e.g. ios on iOS devices, material on Android devices, and mobiscroll on desktop). You can override the accent color for every theme:

$mbsc-ios-accent: #e61d2a;
$mbsc-material-accent: #e61d2a;
$mbsc-mobiscroll-accent: #e61d2a;

@import "~@mobiscroll/JQuery/dist/css/mobiscroll.jquery.scss"

You can also customize the colors on many levels:

1. Theme specific variables (ex. $mbsc-material-background, $mbsc-ios-dark-text) are applied to all components in a theme. Complete list of variables here.
2. Component specific global variables (ex. $mbsc-card-background-light, $mbsc-listview-text-dark) are applied to all themes for a specific component.
3. Component and theme specific variables (ex. $mbsc-ios-dark-form-background, $mbsc-material-input-text) are applied to a specific theme and a specific component.

Tree Shaking for styles

Tree shaking is a term commonly used in web development and particularly in JavaScript for unused code removal. Since websites are served (mostly) over the network, loading times depend on content size, so minification and unused content elimination plays a major role in making webapps fluid.

For the JavaScript part, popular frameworks already have the treeshaking built in, so the components that are not used will be left out from the built project.

Eliminating unused styles

In case of the styles, leaving out the unused rules is not as straight forward.
The overarching idea is that CSS selectors match elements in the DOM, and those elements in the DOM come from all sorts of places: your static templates, dynamic templates based on server-side state, and of course, JavaScript, which can manipulate the DOM in any way at all, including pull things from APIs and third parties.

Sass variables to the rescue

The Mobiscroll Library comes with a modular SASS bundle, that can be configured which component styles and which themes to leave in and out for the compiled css file.

Every component and theme has a SASS variable that can be turned on or off. If the variable is falsy the styles that it needs will not be added to the bundle.

// include the ios theme
$mbsc-ios-theme: true;

// include the components:
$mbsc-datepicker: true;
$mbsc-eventcalendar: true;
        
@import "@mobiscroll/jquery/dist/css/mobiscroll.modular.scss"

In the above example the styles needed for the eventcalendar and datepicker will be included and only for the ios theme. All other components (like select or grid-layout) and all other themes will be left out from the bundle.

Here's the complete list of the components and themes that can be used:

• $mbsc-datepicker
• $mbsc-eventcalendar
• $mbsc-forms
• $mbsc-grid-layout
• $mbsc-popup
• $mbsc-select

• $mbsc-ios-theme
• $mbsc-material-theme
• $mbsc-windows-theme