Create a Simple LightBox in JavaScript

In this example, we create a LightBox using JavaScript and CSS. So when we click on the image the following LightBox will be shown:


Step 1

First we take some images (when we click on the images the LightBox will be shown). We will place this image in a <div> tag like this:

        <div id="fade" class="back">

            <img id="img1" src="Koala.jpg" height="150px" width="200px" onclick="document.getElementById('light').style.display='block';Show();document.getElementById('fade').style.display='block';

document.getElementById('fade').style.opacity='0.2';ShowImage1();" />

            <img id="img2" src="Desert.jpg" height="150px" width="200px" onclick="document.getElementById('fade').style.display='block';

document.getElementById('light').style.display='block';document.getElementById('fade').style.opacity='0.2';ShowImage2();Show();document.getElementById('light').style.display='block';" />

            <img id="img3" src="Lighthouse.jpg" height="150px" width="200px" onclick="document.getElementById('fade').style.display='block';

document.getElementById('fade').style.opacity='0.2';document.getElementById('light').style.opacity='1';ShowImage3();Show();document.getElementById('light').style.display='block';" />

            <img id="img4" src="Penguins.jpg" height="150px" width="200px" onclick="document.getElementById('fade').style.display='block';

document.getElementById('fade').style.opacity='0.2';document.getElementById('light').style.opacity='1';ShowImage4();Show();document.getElementById('light').style.display='block';" />

            <img id="img5" src="Chrysanthemum.jpg" height="150px" width="200px" onclick="document.getElementById('fade').style.display='block';

document.getElementById('fade').style.opacity='0.2';document.getElementById('light').style.opacity='1';ShowImage5();Show();document.getElementById('light').style.display='block';" />


Now we will set the CSS of that div:

        <style type="text/css">



                position: absolute;

                top: 0%;

                left: 0%;

                width: 100%;

                height: 100%;

                background-color: black;

                z-index: 1001;

                -moz-opacity: 0.8;

                filter: alpha(opacity=80);



The output will be:


Step 2

Now we will write the code for the LightBox or Overlay Screen, for that we will use another <div> in which we will use a close button and an image:

        <div id="light" class="overlay">



                    <td height="10%" width="10%" align="right">

                        <img src="Close.jpg" height="10%" width="5%" onclick="document.getElementById('fade').style.display='block';

document.getElementById('fade').style.opacity='1';document.getElementById('light').style.display='none';" />





                        <img id="imgMain" src="Koala.jpg" height="45%" width="100%" />





Now we will set the CSS of that Div:

        <style type="text/css">



                display: none;

                position: absolute;

                -webkit-border-radius: 20px;

                border: 5px solid red;

                background-color: white;

                z-index: 1002;

                overflow: auto;



The output will be:


Step 3

After that we will write the code for the click event of the images so when we click on that the LightBox will be shown:

<img id="img1" src="Koala.jpg" height="150px" width="200px" onclick="document.getElementById('light').style.display='block'; document.getElementById('fade').style.display='block';
document.getElementById('fade').style.opacity='0.2'; Show();ShowImage1();" />

Here we call two JavaScript Functions:

        <script language="javascript">

            var x = 10;

            var l = 10;

            var t = 10;

            function ShowImage1() {

                document.getElementById('imgMain').src = "Koala.jpg";


            function Show() {


                document.getElementById('light').style.width = "0px";

                document.getElementById('light').style.height = "0px";

                setTimeout("Show1()", 500);


            function Show1() {

                if ((x < 400) && (l < 500)) {

                    if (t < 150) {

                        document.getElementById('light') = t + "px";


                    else {

                        document.getElementById('light') = "120px";



                    document.getElementById('light').style.left = l + "px";

                    document.getElementById('light').style.width = x + "px";

                    document.getElementById('light').style.height = x + "px";


                    x = x + 10;

                    l = l + 10;

                    t = t + 10;

                    setTimeout("Show1()", 10);


                else {

                    x = 0

                    l = 0;

                    t = 0;




In this code we will set the image source of the LighBox image and using the Show Function, the LightBox will be shown in a different style.

Step 4

Now we will write code for the Close button:

<img src="Close.jpg" height="10%" width="5%" onclick="document.getElementById('fade').style.display='block';

document.getElementById('fade').style.opacity='1';document.getElementById('light').style.display='none';" />

Here we will set the opacity of the fade and light div so the fade <div> will be visible.


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