Created
September 24, 2016 15:48
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Detect element is in the viewport and then change browser url
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| <!doctype html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>Scrolling URL Hash</title> | |
| <meta name="description" content="Webpage for xxxx"> | |
| <style> | |
| body { | |
| height: 2000px; | |
| } | |
| a > div { | |
| min-height: 500px; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <a href="#anchor1" id="anchor1" class="anchor"><div>ANCHOR 1</div></a> | |
| <a href="#anchor2" id="anchor2" class="anchor"><div>ANCHOR 2</div></a> | |
| <a href="#anchor3" id="anchor3" class="anchor"><div>ANCHOR 3</div></a> | |
| <a href="#anchor4" id="anchor4" class="anchor"><div>ANCHOR 4</div></a> | |
| <a href="#anchor5" id="anchor5" class="anchor"><div>ANCHOR 5</div></a> | |
| <a href="#anchor6" id="anchor6" class="anchor"><div>ANCHOR 6</div></a> | |
| <script src="http://code.jquery.com/jquery-2.1.4.min.js"></script> | |
| <script> | |
| // Source: http://stackoverflow.com/questions/30734552/change-url-while-scrolling | |
| // stackoverflow.com/questions/123999/how-to-tell-if-a-dom-element-is-visible-in-the-current-viewport | |
| function isElementInViewport (el) { | |
| //special bonus for those using jQuery | |
| if (typeof jQuery === "function" && el instanceof jQuery) { | |
| el = el[0]; | |
| } | |
| var rect = el.getBoundingClientRect(); | |
| return ( | |
| rect.top >= 0 && | |
| rect.left >= 0 && | |
| rect.bottom <= (window.innerHeight || document.documentElement.clientHeight) && /*or $(window).height() */ | |
| rect.right <= (window.innerWidth || document.documentElement.clientWidth) /*or $(window).width() */ | |
| ); | |
| } | |
| // click-to-scroll behavior | |
| $(".anchor").click(function (e) { | |
| e.preventDefault(); | |
| var section = this.href; | |
| var sectionClean = section.substring(section.indexOf("#")); | |
| $("html, body").animate({ | |
| scrollTop: $(sectionClean).offset().top | |
| }, 1000, function () { | |
| window.location.hash = sectionClean; | |
| }); | |
| }); | |
| // listen for the scroll event | |
| $(document).on("scroll", function() { | |
| console.log("onscroll event fired..."); | |
| // check if the anchor elements are visible | |
| $(".anchor").each(function (idx, el) { | |
| if ( isElementInViewport(el) ) { | |
| // update the URL hash | |
| if (window.history.pushState) { | |
| var urlHash = "#" + $(el).attr("id"); | |
| window.history.pushState(null, null, urlHash); | |
| } | |
| } | |
| }); | |
| }); | |
| </script> | |
| </body> |
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Thank you so much!