HTML Image Maps

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HTML Image Maps


With HTML image maps, you can create clickable areas on an image.

Image Maps
The HTML <map> tag defines an image map. An image map is an image with
clickable areas. The areas are defined with one or more <area> tags.
Try to click on the computer, phone, or the cup of coffee in the image below:







Example
Here is the HTML source code for the image map above:

<img src="workplace.jpg" alt="Workplace" usemap="#workmap">
<map name="workmap">  <area shape="rect" coords="34,44,270,350"
alt="Computer" href="computer.htm">  <area shape="rect" coords="290,172,333,250"
alt="Phone" href="phone.htm">  <area shape="circle" coords="337,300,44"
alt="Coffee" href="coffee.htm"></map>
Try it Yourself »


How Does it Work?
The idea behind an image map is that you should be able to perform different
actions depending on where in the image you click.
To create an image map you need an image, and some HTML code that describes the clickable areas.







The Image
The image is inserted using the <img> tag.
The only difference from other images is that you must
add a usemap attribute:


<img src="workplace.jpg" alt="Workplace" usemap="#workmap">


The usemap value starts with a hash tag
# followed by the name of the image map, and is used to create a relationship
between the image and the image map.

Tip: You can use any image as an image map!


Create Image Map
Then, add a <map> element.
The <map> element is used to create an image map, and is linked to the image by using the
required name
attribute:


<map name="workmap">


The name attribute must have the same value as the
<img>'s usemap attribute .

The Areas
Then, add the clickable areas.
A clickable area is defined using an <area> element.
Shape
You must define the shape of the clickable area, and you can choose one of these
values:

rect - defines a rectangular region
circle - defines a circular region
poly - defines a polygonal region
default - defines the entire region

You must also define some coordinates to be able to place the clickable area onto
the image. 

Shape="rect"
The coordinates for shape="rect" come in pairs, one for the x-axis and one for the y-axis.
So, the coordinates 34,44 is located 34 pixels
from the left margin and 44 pixels from the top:






The coordinates 270,350 is located 270
pixels from the left margin and 350 pixels from the top:






Now we have enough data to create a clickable rectangular area:

Example

<area shape="rect" coords="34, 44, 270, 350" href="computer.htm">

Try it Yourself »

This is the area that becomes clickable and will send the user to the page "computer.htm":





Shape="circle"
To add a circle area, first locate the coordinates of the center of the circle:
337,300






Then specify the radius of the circle:
44 pixels





Now you have enough data to create a clickable circular area:

Example

<area shape="circle" coords="337, 300, 44" href="coffee.htm">

Try it Yourself »

This is the area that becomes clickable and will send the user to the page "coffee.htm":





Shape="poly"
The shape="poly" contains several coordinate
points, which creates a shape formed with straight lines (a polygon).
This can be used to create any shape.
Like maybe a croissant shape!
How can we make the croissant in the image below become a clickable link?

We have to find the x and y coordinates for all edges of the
croissant:

The coordinates come in pairs, one for the x-axis and one for the y-axis:

Example

<area shape="poly" coords="140,121,181,116,204,160,204,222,191,270,140,329,85,355,58,352,37,322,40,259,103,161,128,147" href="croissant.htm">

Try it Yourself »

This is the area that becomes clickable and will send the user to the page "croissant.htm":


Image Map and JavaScript
A clickable area can also
trigger a JavaScript function.
Add a click event to the <area> element
to execute a JavaScript function:

Example
Here, we use the onclick attribute to execute a JavaScript function when the
area is clicked:

<map name="workmap"> 
<area shape="circle" coords="337,300,44"
href="coffee.htm" onclick="myFunction()"></map><script>function
myFunction() {  alert("You clicked the coffee cup!");}
</script>
Try it Yourself »


Chapter Summary

Use the HTML <map> element to define an image map
Use the HTML <area> element to define the clickable areas in the image map
Use the HTML usemap attribute of the
<img> element to point to an image map


HTML Image Tags


Tag
Description


<img>
Defines an image


<map>
Defines an image map


<area>
Defines a clickable area inside an image map


<picture>
Defines a container for multiple image resources



For a complete list of all available HTML tags, visit our HTML Tag Reference.













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Reference: https://www.w3schools.com/html/html_images_imagemap.asp