Page Scroll jQuery Plugin

Finegrained control over page scrolling.

version 0.1.4

Demo

See working code and illustration of options.

Features

Setting the scroll speed OR the total duration. Or set the speed with a maximum duration. Personally I find a constant speed a better experience for short scrolls, but scrolling a long page would take too long. With a max duration set, scrolling is always constant - up to a given length.

Scroll on click or any other event. For instance, you can scroll the page on page load.

Callback functions beforeScroll and didScroll. Both functions get the scroll options object passed that can be changed "on the fly". The beforeScroll function also acts as a delegate: pass 'false' to stop scrolling.

Use pushState to update the url.

Both callback functions can be called after an optional delay. For instance to scroll up to tab pane buttons, wait a little, and switch to a different tab.

Of course the plugin supports expected features: target, offset, easing, and support for named anchors as well as ids.

Usage

Quick and easy - add page scrolling to all links on the page:

    $("a").pageScroll();

Or to target anchor links only:

    $("a[href*='#']").pageScroll();
	

Or pass options:

    $("a").pageScroll({
        duration: 3000
    });
	
	

Conditionally stop scrolling:

    $('a').pageScroll({
        mayScroll: function(opts) {
            var stop = confirm("Stop scrolling?");
            if (stop) {
                return false;
            } else {
                return true;
            }
        }
    });

Change the scroll object:

    $('a').pageScroll({
        willScroll: function(opts) {
            alert("will scroll; duration=" + opts.duration);
            // speed up
            opts.duration = 100;
        },
        didScroll: function(opts) {
            alert("did scroll; duration=" + opts.duration);
        },
    });

Scroll on page load:

	if (location.hash) {
		if ($(location.hash).length) {
			// hide body before forcing to top
			$('body').hide();
			// secretly go to top
			window.scrollTo(0, 0);
		}
	}
	
	$(window).pageScroll({
		id: location.hash,
		event: 'load hashchange',
		speed: 700,
		maxDuration: 2000,
		mayScroll: function(opts) {
			if ($('body').is(':hidden')) {
				$('body').show();
			}
		}
	});

Use $.pageScroll({...}) to programmatically scroll to a target. The same options can be used.

Options

• speed: pixels per second; calculates the duration
• maxDuration: (only used with speed) maximum scroll duration in milliseconds
• offset: pixels
• duration: explicitly set scroll duration in milliseconds; 0 means immediate (no scrolling easing); overrides speed
• easing: easing name, like 'swing' (default) (use jquery.easing for more easing possibilities)
• scroller: jQuery selector to scroll; default 'html, body'
• target: jQuery element to scroll to; default not set
• id: target id to scroll to; may be a url hash like '#bottom'; default not set
• updateUrl: should the url be updated with the anchor id to make it bookmarkable; default true
• event: event that triggers scrolling; may be a space-separated list of event names, like 'load hashchange'; default 'click'
• mayScroll: function called before scrolling; the function is called with the "scroll options" object as parameter; return false to stop scrolling
• willScroll: function called just before scrolling will happen; the function is called with the "scroll options" object as parameter and can be changed on the fly
• willScrollDelay: milliseconds to wait before scrolling actually happens
• didScroll: function called when scrolling is complete; the function is called with the "scroll options" object as parameter
• didScrollDelay: milliseconds to wait before calling didScroll; default 0
• pushState: true if anchor changes are reflected in the url using history.pushState; default true

Reset default values by passing null.

License

The MIT License

Copyright (c) 2012-2013 Arthur Clemens, [email protected]

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

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

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.