HTML Iframes & HTML JavaScript

An HTML iframe is used to display a web page within a web page.

HTML Iframe Syntax

• The HTML <iframe> tag specifies an inline frame.
• An inline frame is used to embed another document within the current HTML document.

Syntax

<iframe src="https://cn.edurev.in/rl" title="description"></iframe>

Tip: It is a good practice to always include a title attribute for the <iframe>. This is used by screen readers to read out what the content of the iframe is.

Iframe - Set Height and Width

• Use the height and width attributes to specify the size of the iframe.
• The height and width are specified in pixels by default:

Example

<iframe src="https://cn.edurev.in/emo_iframe.htm" height="200" width="300" title="Iframe Example"></iframe>

Or you can add the style attribute and use the CSS height and width properties:

Example

<iframe src="https://cn.edurev.in/emo_iframe.htm" style="height:200px;width:300px;" title="Iframe Example"></iframe>

Iframe - Remove the Border

• By default, an iframe has a border around it.
• To remove the border, add the style attribute and use the CSS border property:

Example

<iframe src="https://cn.edurev.in/emo_iframe.htm" style="border:none;" title="Iframe Example"></iframe>

With CSS, you can also change the size, style and color of the iframe's border:

Example

<iframe src="https://cn.edurev.in/emo_iframe.htm" style="border:2px solid red;" title="Iframe Example"></iframe>

Iframe - Target for a Link

An iframe can be used as the target frame for a link.

The target attribute of the link must refer to the name attribute of the iframe:

Example

<iframe src="https://cn.edurev.in/emo_iframe.htm" name="iframe_a" title="Iframe Example"></iframe>

<p><a href="https://www.w3schools.com" target="iframe_a">W3Schools.com</a></p>

HTML JavaScript

JavaScript makes HTML pages more dynamic and interactive.
Example

The HTML <script> Tag

• The HTML <script> tag is used to define a client-side script (JavaScript).
• The <script> element either contains script statements, or it points to an external script file through the src attribute.
• Common uses for JavaScript are image manipulation, form validation, and dynamic changes of content.
• To select an HTML element, JavaScript most often uses the document.getElementById() method.
• This JavaScript example writes "Hello JavaScript!" into an HTML element with id="demo":

Example

<script>

document.getElementById("demo").innerHTML = "Hello JavaScript!";

</script>

A Taste of JavaScript

Here are some examples of what JavaScript can do:

Example

JavaScript can change content:

document.getElementById("demo").innerHTML = "Hello JavaScript!";

Example

JavaScript can change styles:

document.getElementById("demo").style.fontSize = "25px";

document.getElementById("demo").style.color = "red";

document.getElementById("demo").style.backgroundColor = "yellow";

Example

JavaScript can change attributes:

document.getElementById("image").src = "picture.gif";

The HTML <noscript> Tag

The HTML <noscript> tag defines an alternate content to be displayed to users that have disabled scripts in their browser or have a browser that doesn't support scripts:

Example

<script>

document.getElementById("demo").innerHTML = "Hello JavaScript!";

</script>

<noscript>Sorry, your browser does not support JavaScript!</noscript>