How to make text appear on scroll in html

Question

Hello, I want a certain text to appear when I scroll past it or when I scroll until the point where the text is. The effect when appearing should be somewhat like the first effect on the top of the website http://namanyayg.com/.

I want the effect in minimal code with pure CSS and JS i.e no jQuery.

I was thinking that maybe I would use something like a display:none property for a span and then when you scroll past it the display becomes block but I dont know how to trigger the effect using javascript. Any help would be appreciated.

Answer 1

First wrap whatever your text or content that you want to show on scroll, in one div so that you can show hide the div depending upon the scroll. Write two classes for your target div.

Your CSS:

/*Use this class when you want your content to be hidden*/
.BeforeScroll
{
  height: 100px; /*Whatever you want*/
  width: 100%; /*Whatever you want*/
  .
  .
  display: none;
}


/*Use this class when you want your content to be shown after some scroll*/
.AfterScroll
{
  height: 100px; /*Whatever you want*/
  width: 100%; /*Whatever you want*/
  .
  .
  display: block;
}

Your HTML:

<!--Set class BeforeScoll to your target div-->

<div id = "divToShowHide" class = "BeforeScroll">Content you want to show hide on scroll</div>

Your Script:

<!--include these script in head section or wherever you want-->

<script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.10.1/jquery-ui.min.js" type="text/javascript"></script> 

<script type = "text/javascript">
$(document).ready(function(){
  //Take your div into one js variable
  var div = $("#divToShowHide");
  //Take the current position (vertical position from top) of your div in the variable
  var pos = div.position();
  //Now when scroll event trigger do following
  $(window).scroll(function () {
   var windowpos = $(window).scrollTop();
   //Now if you scroll more than 100 pixels vertically change the class to AfterScroll
   // I am taking 100px scroll, you can take whatever you need
   if (windowpos >= (pos.top - 100)) {
     div.addClass("AfterScroll");
   }
   //If scroll is less than 100px, remove the class AfterScroll so that your content will be hidden again 
   else {
     s.removeClass("AfterScroll");
   }
   //Note: If you want the content should be shown always once you scroll and do not want to hide it again when go to top agian, no need to write the else part
 });
});
</script>

Hope it will solve your problem.