jquery.smartSticky

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jquery.smartSticky

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Free, easy to use, javascript library for toggling between original and fixed position, because of limited support of sticky position even in newer browsers.

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# Jquery.smartSticky
Free, easy to use, javascript library for toggling between original and fixed position, because of limited support of sticky position even in newer browsers.

Current stable version: **2.7.1**

### Features
Jquery.smartSticky supports:
* Highly customizable visibility and placement of the element
* Toggling between top and bottom position
* Displaying of fixed element only inside of container area
* Implementation of own callbacks and positions
* Support of fixed header in tables

### Installation and dependencies
SmartSticky is built on and works properly with [jQuery](http://jquery.com/).

#### 1. Include JS/CSS
Include the following code in the `<head>` tag of your HTML:

```html

<script type="text/javascript" src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>

<link rel="stylesheet" href="/dist/css/jquery.smartSticky.min.css">
<script type="text/javascript" src="/dist/js/jquery.smartSticky.min.js"></script>
```

#### 2. Usage

```javascript
$('#myElem').smartSticky([options])
```

- **options** (optional)
  - Type: `Object`
  - Default options to be changed, see the list of available options below.
  
  
#### 3. Initialization

You can use the following code with default options.

`null` properties are computed automatically by library.

```javascript
$(function() {
    $('#myElem').smartSticky({
        show: {
            immediately: false,
            delay: 50,  /* ignored when immediately set to true */
            original: {
                under: true,
                above: false
            },
            fixed: 'top',
            scrolling: {
                up: true,
                down: true
            }
        },
        container: null,
        css: {
            fixed: {
                width: null,
                left: null
            }
        }
    });
});
```

### Options

#### show.delay
- Type: `Number`
- Default: `50`

ScrollTop value that postpones showing of the fixed element and accelerates its hiding on return. Use `0` to deactivate.

#### show.immediately
- Type: `Boolean`
- Default: `false`

Determines if the element becomes fixed immediately when its original position is reached. If set to `'true'` option `'show.delay'` is ignored.

#### show.original.above
- Type: `Boolean`
- Default: `false`

Determines if the element can be shown above its original position.

#### show.original.under
- Type: `Boolean`
- Default: `true`

Determines if the element can be shown under its original position.

#### show.fixed
- Type: `String`
- Default: `'top'`

Determines placement of the fixed element.

Possible predefined values are `'top'`, `'bottom'` and `'toggle'`.

`'toggle'` places fixed element top while scrolling down and bottom while scrolling up. If used, options `show.scrolling.up` and `show.scrolling.down` should be set to `true`, eventually, callback `show.scrolling` should return `true` for properly behaviour.

If you want to define your own placement position callback, extend default positions object like with the following code:

```javascript
$.fn.smartSticky.positions['myAwesomePosition1'] = function (positionManager) {
    if (positionManager.getScrollingManager().scrollingDown()) {
        return { top: 10 };
    }

return { bottom: 10 };
};

$.fn.smartSticky.positions['myAwesomePosition2'] = function () {
    if ($(window).outerWidth() < 900) {
         return { bottom: 0 };
    }

return 'toggle';
};

// change options
show: {
    fixed: 'myAwesomePosition1'
}

```
This callback can be used in two different ways: 
- return `Object` with extra `'top'` or `'bottom'`.
- return `String` with name of other defined position to apply.

#### show.fixed (settingsManager, scrollingManager)
- Returns: `String`

One of the accepted values of `show.fixed` option property.

```javascript
show: {
    fixed: function () {
        if ($(window).width() < 768) {
         /* on mobile phones */
             return 'bottom';
        }

return 'toggle';
    }
}
```

#### show.scrolling.up
- Type: `Boolean`
- Default: `true`

Determines if the fixed element can be shown while scrolling up.

If `show.fixed` is set to `'toggle'`, this option should be set to `true` for properly behaviour.

#### show.scrolling.down
- Type: `Boolean`
- Default: `true`

Determines if the fixed element can be shown while scrolling down.

If `show.fixed` is set to `'toggle'`, this option should be set to `true` for properly behaviour.

#### show.scrolling (settingsManager, scrollingManager)
- Returns: `Boolean`

Determines visibility of the fixed element while scrolling.

Use `true` to show and `false` to hide.

If `show.fixed` is set to `'toggle'`, this callback should return `true` for properly behaviour.

```javascript
show: {
    scrolling: function (settingsManager, scrollingManager) {
        if ($(window).width() < 768) {
        /* on mobile phones */
            return !scrollingManager.scrollingDown();
        }

return scrollingManager.scrollingDown();
    }
}
```

#### container
- Type: `HTMLelement`, `HTMLCollection`, `JQuery` or `String`
- Default: `null`

The fixed element can be displayed only inside of container area.

By default, the element's original parent is used.

Use `String` to find element by selector.

If more elements are included in `JQuery` collection or if they are found by `String` selector, first element is used.

If no element is included in `JQuery` collection or found by `String` selector, default container is used.

#### container (settingsManager)
- Returns: `HTMLelement`, `HTMLCollection`, `JQuery` or `String`

```javascript
container: function (settingsManager) {
    /*
        <div class="row">
            <div class="col-3">
                 <div class="sticky-smart"></div>
            </div>
            <div class="col-9">
                 ....
            </div>
        </div>
    */

return settingsManager.getElement().closest('.row');
}
```

#### css.fixed.left
- Type: `Number` or `String`
- Default: `null`

By default, the element's offset left in original position is used.

Sets css left property of the fixed element.

#### css.fixed.width
- Type: `Number` or `String`
- Default: `null`

By default, the element's outer width in original position is used.

Sets css width property of the fixed element.

#### css.fixed.left (settingsManager) and css.fixed.width (settingsManager)
- Return `Number` or `String`

Set css left and width property of the fixed element.

If you want to change top or bottom property of the fixed element, define your own placement position callback as described above.

```javascript
css: {
    fixed: {
        left: function (settingsManager) {
            if ($(window).width() < 768) {
               /* on mobile phones */
                return 0;
            }

return settingsManager.getElement().offset().left;
        },
    width: function (settingsManager) {
            if ($(window).width() < 768) {
                /* on mobile phones */
                return '100%';
            }

return settingsManager.getElement().outerWidth();
        }
    }
}
```

### Options callbacks arguments

smartSticky library works with the following managers which are provided in callbacks as arguments. You can access their methods (getters and boolean queries) to find out useful information.

**Attention:** Using of other manager's methods then listed below (etc. private setters), or modifying its private underline properties can cause unexpectable behaviour.

#### settingsManager
- Type: `Object`
- Methods: `getElement()`, `getContainer()` and `getOptions()`

#### scrollingManager
- Type: `Object`
- Methods: `scrollingDown()` and `getCurrentScrollTop()`

#### positionManager
- Type: `Object`
- Methods: `getSettingsManager()`, `getScrollingManager()`, `getFixedPosition()` and `getYCoordManager()`

### Defaults
If you want to change default settings, use the following code:
```javascript
$.extend( true, $.fn.smartSticky.defaults, {
    show: {
        delay: 0
    }
} );
```

### Methods

Use only after **initialization**.

```javascript
$('.myElems').smartSticky('methodName', argument1, argument2, ...);

/* or */

$('.myElems').each(function () {
    $(this).smartSticky('instance').methodName(argument1, argument2, ...);
});

```

#### setOptions (options)
Updates dynamically options.

```javascript
$('#myElem').smartSticky('setOptions', {
    show: {
        scrolling: {
            up: true
        }
    }
});
```

#### enable ()
Enables component.

#### disable ()
Disables component.

#### hide ()
Hides fixed element until it is about to be shown again.

### Events

Use the following code to set callback on event. Set them before smartSticky initialization.

```javascript
$('#myElem').on('smartSticky.eventName', function (e, settingsManager) {
	
}).smartSticky();
```

#### activate
Fires when element's fixed position is going to be set.

```javascript
$('#myElem').on('smartSticky.activate', function (e, settingsManager) {
	$(this).css('border', '1px solid black');
}).smartSticky();
```

#### deactivate
Fires when element's original position is going to be set.

#### activated
Fires immediately after element had been activated.

#### deactivated
Fires immediately after element had been deactivated.

#### init
Fires after smart sticky had been fully initialized.

### License
jquery.smartSticky may be freely distributed under the MIT license.

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