CODEWITHSUNDEEP
javascriptjqueryhtmldjango
user8931234
user8931234

Reputation:

How to show content by scrolling down?

I have written some html code for my webpage in which multiple images are shown. the problem is, all the images are loaded at the starting itself. I want to change that to show extra images by scrolling down. How to do that with jQuery?

The code is:

    {% extends "base.html" %}
{% load staticfiles %}

{% block content %}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="container">
      <h2>Pictures of Coffee</h2>
      <div class="row">
        <div class="col-lg-4 col-xs-6 thumbnail"><img src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/04LDEYRW59.jpg" alt=""></div>
        <div class="col-lg-4 col-xs-6 thumbnail"><img  src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/90V03Q5Y60.jpg" alt=""></div>
        <div class="col-lg-4 col-xs-6 thumbnail"><img  src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/O83SF2RB6D.jpg" alt=""></div>
        <div class="col-lg-4 col-xs-6 thumbnail"><img  src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/5JVPSVP7EI.jpg" alt=""></div>
        <div class="col-lg-4 col-xs-6 thumbnail"><img  src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/C5Y10KIIHA.jpg" alt=""></div>
        <div class="col-lg-4 col-xs-6 thumbnail"><img  src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/YSSFRY5B25.jpg" alt=""></div>
        <div class="col-lg-4 col-xs-6 thumbnail"><img src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/04LDEYRW59.jpg" alt=""></div>
        <div class="col-lg-4 col-xs-6 thumbnail"><img  src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/90V03Q5Y60.jpg" alt=""></div>
        <div class="col-lg-4 col-xs-6 thumbnail"><img  src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/O83SF2RB6D.jpg" alt=""></div>
        <div class="col-lg-4 col-xs-6 thumbnail"><img  src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/5JVPSVP7EI.jpg" alt=""></div>
        <div class="col-lg-4 col-xs-6 thumbnail"><img  src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/C5Y10KIIHA.jpg" alt=""></div>
        <div class="col-lg-4 col-xs-6 thumbnail"><img  src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/YSSFRY5B25.jpg" alt=""></div>
        <div class="col-lg-4 col-xs-6 thumbnail"><img src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/04LDEYRW59.jpg" alt=""></div>
        <div class="col-lg-4 col-xs-6 thumbnail"><img  src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/90V03Q5Y60.jpg" alt=""></div>
        <div class="col-lg-4 col-xs-6 thumbnail"><img  src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/O83SF2RB6D.jpg" alt=""></div>
        <div class="col-lg-4 col-xs-6 thumbnail"><img  src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/5JVPSVP7EI.jpg" alt=""></div>
        <div class="col-lg-4 col-xs-6 thumbnail"><img  src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/C5Y10KIIHA.jpg" alt=""></div>
        <div class="col-lg-4 col-xs-6 thumbnail"><img  src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/YSSFRY5B25.jpg" alt=""></div>
        <div class="col-lg-4 col-xs-6 thumbnail"><img src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/04LDEYRW59.jpg" alt=""></div>
        <div class="col-lg-4 col-xs-6 thumbnail"><img  src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/90V03Q5Y60.jpg" alt=""></div>
        <div class="col-lg-4 col-xs-6 thumbnail"><img  src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/O83SF2RB6D.jpg" alt=""></div>
        <div class="col-lg-4 col-xs-6 thumbnail"><img  src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/5JVPSVP7EI.jpg" alt=""></div>
        <div class="col-lg-4 col-xs-6 thumbnail"><img  src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/C5Y10KIIHA.jpg" alt=""></div>
        <div class="col-lg-4 col-xs-6 thumbnail"><img  src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/YSSFRY5B25.jpg" alt=""></div>
        <div class="col-lg-4 col-xs-6 thumbnail"><img src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/04LDEYRW59.jpg" alt=""></div>
        <div class="col-lg-4 col-xs-6 thumbnail"><img  src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/90V03Q5Y60.jpg" alt=""></div>
        <div class="col-lg-4 col-xs-6 thumbnail"><img  src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/O83SF2RB6D.jpg" alt=""></div>
        <div class="col-lg-4 col-xs-6 thumbnail"><img  src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/5JVPSVP7EI.jpg" alt=""></div>
        <div class="col-lg-4 col-xs-6 thumbnail"><img  src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/C5Y10KIIHA.jpg" alt=""></div>
        <div class="col-lg-4 col-xs-6 thumbnail"><img  src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/YSSFRY5B25.jpg" alt=""></div>
      </div>

    </div>
{% endblock %}

I just want to add javascript so that when the page is scrolled down, the images will be loaded. I tried the code from codepen website, but it is working. How to solve this?

Upvotes: 3

Views: 129

Answers (3)

lausent
lausent

Reputation: 325

First of all bootstrap divide a row in 12 columns so for example:

<div class="container">
        <div class="row">
             <div class="col-xs-4 col-lg-4 thumbnail"><img src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/04LDEYRW59.jpg" alt=""></div>
             <div class="col-xs-4 col-lg-4 thumbnail"><img  src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/90V03Q5Y60.jpg" alt=""></div>
             <div class="col-xs-4 col-lg-4 thumbnail"><img  src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/O83SF2RB6D.jpg" alt=""></div>
        </div>
</div>

use another row with columns like above (in the container). To make the scroll effects you need three components: Animate ccs https://daneden.github.io/animate.css/ viewportchecker https://github.com/dirkgroenen/jQuery-viewport-checker jquery http://code.jquery.com/jquery.js
Follow this example add this in the tag head of the html template. Where you find href or src you must overwrite with the path where you store the three files above OR you can directly use external file, for example http://code.jquery.com/jquery.js

<link rel="stylesheet" type="text/css" href="animate.css" />
<script src="viewportchecker.js"></script>
<script src="http://code.jquery.com/jquery.js"></script>
<style>
    .hidden{opacity:0;}
    .visible{opacity:1;}
</style>

in the body tag add this, replace the container with your code BUT remember that the script add the effect to ".post" class so maybe you will want change the name of your code class or you can also change the class in the script:

<div class="container">
            <div class="post"> <!-- Post content goes here --> </div>
            <div class="post"> <!-- Post content goes here --> </div>
            <div class="post"> <!-- Post content goes here --> </div>
            <div class="post"> <!-- Post content goes here --> </div>
            <div class="post"> <!-- Post content goes here --> </div>
            <div class="post"> <!-- Post content goes here --> </div>
</div>

Upvotes: 0

Edison Trutwein
Edison Trutwein

Reputation: 775

This would help :)

Run the code snippet and check.

As you keep scrolling the page, the remaining images on the screen would get displayed if the window scroll position is greater than the last image scroll position.

function showImages(){
    
  var imgStartIndex = 0;
  var nextSetOfImages = 10;
  var incrementImageLimit = 10;
  var collectionOfImages = $(".thumbnail img");
  var noOfImages = collectionOfImages.length;

  return function(){
  
    for (var i = imgStartIndex; i < nextSetOfImages; i++){
      $(collectionOfImages[i]).fadeIn().addClass("shown");
    } 

    imgStartIndex = imgStartIndex + incrementImageLimit;
    nextSetOfImages = imgStartIndex + nextSetOfImages;
    nextSetOfImages = (nextSetOfImages >= noOfImages) ? noOfImages : nextSetOfImages;

  };
    
}

var disImg = showImages();

$(document).ready(function(){
  disImg();
  
  $(document).scroll(function(){
    
    var scollPostion = $(window).scrollTop();
    var imgShownLast = $(".thumbnail img.shown").last();
    var imgShowFist = $(".thumbnail img.shown").first();
    var imgLastScrollPos = $(imgShownLast).offset().top;
    var imgFirstScrollPos = $(imgShowFist).offset().top;
    scollPostion = scollPostion + imgFirstScrollPos + 200; 
    if(scollPostion > imgLastScrollPos){ 
      disImg();
    }
    
  });
  
});
.thumbnail img{
  width:100px;
  height:100px;
  display:none;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<div class="container">
      <h2>Pictures of Coffee</h2>
      <div class="row">
        <div class="col-lg-4 col-xs-6 thumbnail"><img src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/04LDEYRW59.jpg" alt=""></div>
        <div class="col-lg-4 col-xs-6 thumbnail"><img  src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/90V03Q5Y60.jpg" alt=""></div>
        <div class="col-lg-4 col-xs-6 thumbnail"><img  src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/O83SF2RB6D.jpg" alt=""></div>
        <div class="col-lg-4 col-xs-6 thumbnail"><img  src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/5JVPSVP7EI.jpg" alt=""></div>
        <div class="col-lg-4 col-xs-6 thumbnail"><img  src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/C5Y10KIIHA.jpg" alt=""></div>
        <div class="col-lg-4 col-xs-6 thumbnail"><img  src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/YSSFRY5B25.jpg" alt=""></div>
        <div class="col-lg-4 col-xs-6 thumbnail"><img src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/04LDEYRW59.jpg" alt=""></div>
        <div class="col-lg-4 col-xs-6 thumbnail"><img  src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/90V03Q5Y60.jpg" alt=""></div>
        <div class="col-lg-4 col-xs-6 thumbnail"><img  src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/O83SF2RB6D.jpg" alt=""></div>
        <div class="col-lg-4 col-xs-6 thumbnail"><img  src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/5JVPSVP7EI.jpg" alt=""></div>
        <div class="col-lg-4 col-xs-6 thumbnail"><img  src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/C5Y10KIIHA.jpg" alt=""></div>
        <div class="col-lg-4 col-xs-6 thumbnail"><img  src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/YSSFRY5B25.jpg" alt=""></div>
        <div class="col-lg-4 col-xs-6 thumbnail"><img src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/04LDEYRW59.jpg" alt=""></div>
        <div class="col-lg-4 col-xs-6 thumbnail"><img  src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/90V03Q5Y60.jpg" alt=""></div>
        <div class="col-lg-4 col-xs-6 thumbnail"><img  src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/O83SF2RB6D.jpg" alt=""></div>
        <div class="col-lg-4 col-xs-6 thumbnail"><img  src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/5JVPSVP7EI.jpg" alt=""></div>
        <div class="col-lg-4 col-xs-6 thumbnail"><img  src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/C5Y10KIIHA.jpg" alt=""></div>
        <div class="col-lg-4 col-xs-6 thumbnail"><img  src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/YSSFRY5B25.jpg" alt=""></div>
        <div class="col-lg-4 col-xs-6 thumbnail"><img src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/04LDEYRW59.jpg" alt=""></div>
        <div class="col-lg-4 col-xs-6 thumbnail"><img  src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/90V03Q5Y60.jpg" alt=""></div>
        <div class="col-lg-4 col-xs-6 thumbnail"><img  src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/O83SF2RB6D.jpg" alt=""></div>
        <div class="col-lg-4 col-xs-6 thumbnail"><img  src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/5JVPSVP7EI.jpg" alt=""></div>
        <div class="col-lg-4 col-xs-6 thumbnail"><img  src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/C5Y10KIIHA.jpg" alt=""></div>
        <div class="col-lg-4 col-xs-6 thumbnail"><img  src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/YSSFRY5B25.jpg" alt=""></div>
        <div class="col-lg-4 col-xs-6 thumbnail"><img src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/04LDEYRW59.jpg" alt=""></div>
        <div class="col-lg-4 col-xs-6 thumbnail"><img  src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/90V03Q5Y60.jpg" alt=""></div>
        <div class="col-lg-4 col-xs-6 thumbnail"><img  src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/O83SF2RB6D.jpg" alt=""></div>
        <div class="col-lg-4 col-xs-6 thumbnail"><img  src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/5JVPSVP7EI.jpg" alt=""></div>
        <div class="col-lg-4 col-xs-6 thumbnail"><img  src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/C5Y10KIIHA.jpg" alt=""></div>
        <div class="col-lg-4 col-xs-6 thumbnail"><img  src="https://d2lm6fxwu08ot6.cloudfront.net/img-thumbs/960w/YSSFRY5B25.jpg" alt=""></div>
      </div>

    </div>

Upvotes: 2

Sunny
Sunny

Reputation: 615

event for scroll is:

$(window).on('scroll', function() {

 //write your logics to load your images as per requirements

})

Upvotes: 0

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