Solved

Run Script only if a div is in the viewport

Posted on 2016-11-05
6
39 Views
Last Modified: 2016-11-07
I need to run a script only if it is in the viewport.  The following runs it to early cause the divs I need to see are still below the fold so the animation plays before you can see it.  How do I fire a script only if the div is in the viewport?
 $ =  jQuery
            $(window).on('scroll', function(){

                  if($('.imgs').hasClass('animated-in')){

                    $('#paichart1').pieChart({
                        barColor: '#ED1C23',
                        trackColor: '#DFE0E0',
                        lineCap: 'butt',
                        lineWidth: 20,
                        onStep: function (from, to, percent) {
                            $(this.element).find('.pie-value').text(Math.round(percent) + '%');
                        }
                    });

                    $('#paichart2').pieChart({
                        barColor: '#ED1C23',
                        trackColor: '#DFE0E0',
                        lineCap: 'butt',
                        lineWidth: 20,
                        onStep: function (from, to, percent) {
                            $(this.element).find('.pie-value').text(Math.round(percent) + '%');
                        }
                    });
                    
                    $('.imgs').removeClass('animated-in animated hidde_data');
                }
            })
            

Open in new window

0
Comment
Question by:rgranlund
  • 2
  • 2
  • 2
6 Comments
 
LVL 82

Expert Comment

by:leakim971
ID: 41875728
Using this plugin : https://github.com/customd/jquery-visible

 if($("#yourDivID").visible()) {

Open in new window


(function($){

    /**
     * Copyright 2012, Digital Fusion
     * Licensed under the MIT license.
     * http://teamdf.com/jquery-plugins/license/
     *
     * @author Sam Sehnert
     * @desc A small plugin that checks whether elements are within
     *       the user visible viewport of a web browser.
     *       only accounts for vertical position, not horizontal.
     */
    var $w = $(window);
    $.fn.visible = function(partial,hidden,direction){

        if (this.length < 1)
            return;

        var $t        = this.length > 1 ? this.eq(0) : this,
            t         = $t.get(0),
            vpWidth   = $w.width(),
            vpHeight  = $w.height(),
            direction = (direction) ? direction : 'both',
            clientSize = hidden === true ? t.offsetWidth * t.offsetHeight : true;

        if (typeof t.getBoundingClientRect === 'function'){

            // Use this native browser method, if available.
            var rec = t.getBoundingClientRect(),
                tViz = rec.top    >= 0 && rec.top    <  vpHeight,
                bViz = rec.bottom >  0 && rec.bottom <= vpHeight,
                lViz = rec.left   >= 0 && rec.left   <  vpWidth,
                rViz = rec.right  >  0 && rec.right  <= vpWidth,
                vVisible   = partial ? tViz || bViz : tViz && bViz,
                hVisible   = partial ? lViz || rViz : lViz && rViz;

            if(direction === 'both')
                return clientSize && vVisible && hVisible;
            else if(direction === 'vertical')
                return clientSize && vVisible;
            else if(direction === 'horizontal')
                return clientSize && hVisible;
        } else {

            var viewTop         = $w.scrollTop(),
                viewBottom      = viewTop + vpHeight,
                viewLeft        = $w.scrollLeft(),
                viewRight       = viewLeft + vpWidth,
                offset          = $t.offset(),
                _top            = offset.top,
                _bottom         = _top + $t.height(),
                _left           = offset.left,
                _right          = _left + $t.width(),
                compareTop      = partial === true ? _bottom : _top,
                compareBottom   = partial === true ? _top : _bottom,
                compareLeft     = partial === true ? _right : _left,
                compareRight    = partial === true ? _left : _right;

            if(direction === 'both')
                return !!clientSize && ((compareBottom <= viewBottom) && (compareTop >= viewTop)) && ((compareRight <= viewRight) && (compareLeft >= viewLeft));
            else if(direction === 'vertical')
                return !!clientSize && ((compareBottom <= viewBottom) && (compareTop >= viewTop));
            else if(direction === 'horizontal')
                return !!clientSize && ((compareRight <= viewRight) && (compareLeft >= viewLeft));
        }
    };

})(jQuery);

Open in new window

0
 
LVL 7

Author Comment

by:rgranlund
ID: 41875732
Is that script the plugin?  If so Can I place it directly on the page or do I need to include it?
0
 
LVL 82

Expert Comment

by:leakim971
ID: 41875789
Best is to download it and include it so in your page
0
3 Use Cases for Connected Systems

Our Dev teams are like yours. They’re continually cranking out code for new features/bugs fixes, testing, deploying, testing some more, responding to production monitoring events and more. It’s complex. So, we thought you’d like to see what’s working for us.

 
LVL 52

Accepted Solution

by:
Julian Hansen earned 500 total points
ID: 41875898
A simple implementation - activates animation once after target element scrolls into view
<script>
var done = false;
$(function() {
	$(window).scroll(function() {
		if (done) return;
		t = $('.target');
		offset = t.offset();
		st = $(window).scrollTop();
		wh = $(window).height();
		if (st > offset.top - wh + t.height()) {
			doAnimate();
			done = true;
		}
	});
});
</script>

Open in new window

Working sample here
0
 
LVL 7

Author Closing Comment

by:rgranlund
ID: 41877639
Thanks
0
 
LVL 52

Expert Comment

by:Julian Hansen
ID: 41878224
You are welcome
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Requirements JQuery 1.6+ HTML CSS Introduction This article was inspired by an EE question (http://www.experts-exchange.com/Programming/Languages/Scripting/JavaScript/Q_28372511.html) on how to make a page show some balloons animate up a page…
Introduction If you're like most people, you have occasionally made a typographical error when you're entering information into an online form.  And to your consternation, the browser remembers the error, and offers to autocomplete your future entr…
The viewer will learn how to dynamically set the form action using jQuery.
The viewer will learn the basics of jQuery including how to code hide show and toggles. Reference your jQuery libraries: (CODE) Include your new external js/jQuery file: (CODE) Write your first lines of code to setup your site for jQuery…

861 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

26 Experts available now in Live!

Get 1:1 Help Now