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jQuery RTL Scroll Type Detector

Horizontal scrollbar with RTL(right to left) language support has different implementations in different browsers.

scrollLeft in RTL element is <del>not defined by any spec or standards</del>. So different browsers have different implementations. As far as I know, there are three implements: Chrome(Blink), Firefox/Safari, IE.

Chrome's RTL scrollbar is the same as LTR(left to right) element. Except for the initial position of the scrollbar controller is at the most right position.

Firefox has a clear definition in its MDN document. The most right position stands for 0. And when the user scrolls to the left. The value decreases. The value is possible to be negative in this implement.

IE thought the element is flip horizontal. So the most right position is 0. And if it scrolls to the left. Value increases.

A table is below to show these types more clear.

This plugin is designed to detect which type is the browser is using. Assign the result to jQuery's support object named rtlScrollType. You will need the scrollWidth of the element to transform between these three types of value.

3 Types of scrollLeft (scrollWidth = 100)

<table> <thead> <tr> <th>Browser</th> <th>Type</th> <th>Most Left</th> <th>Most Right</th> <th>Initial</th> </tr> </thead> <tbody> <tr> <td>Chrome/Opera(Blink)/Edge(Blink)/IE6</td> <td>default</td> <td>0</td> <td>100</td> <td>100</td> </tr> <tr> <td><a href="https://drafts.csswg.org/cssom-view/#dom-window-scroll">Standard</a>/Firefox/Safari/Opera(Presto)</td> <td>negative</td> <td>-100</td> <td>0</td> <td>0</td> </tr> <tr> <td>IE8 and later</td> <td>reverse</td> <td>100</td> <td>0</td> <td>0</td> </tr> <tbody> </table>

Usage

See demo.

Web Standard

It's defined in CSSOM View Module. The negative type is the chosen one. Chrome has a plan to change its behavior. More information is at #6.

License

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The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

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