HTML DOM Using the DOM

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HTML DOM
DOM HOME
DOM Intro
DOM Nodes
DOM Node Tree
DOM Methods
DOM Node Access
DOM Node Info
DOM How To
DOM Events
DOM Reference
DOM Summary
DOM Examples
DOM Examples
DOM Objects
DOM Window
DOM Navigator
DOM Screen
DOM History
DOM Location
DOM Document
DOM Anchor
DOM Area
DOM Base
DOM Body
DOM Button
DOM Event
DOM Form
DOM Frame
DOM Frameset
DOM IFrame
DOM Image
DOM Input Button
DOM Input Checkbox
DOM Input File
DOM Input Hidden
DOM Input Password
DOM Input Radio
DOM Input Reset
DOM Input Submit
DOM Input Text
DOM Link
DOM Meta
DOM Object
DOM Option
DOM Select
DOM Style
DOM Table
DOM TableCell
DOM TableRow
DOM Textarea

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# HTML DOM - How to Change HTML Elements

HTML elements are changed using JavaScript, the HTML DOM and events.

## Changing an HTML Element

The HTML DOM and JavaScript can be used to change the inner content and attributes of HTML elements dynamically.

## Example 1 - Change the Background Color

The following example changes the background color of the <body> element:

    <html>
    <body>
    <script type="text/javascript">
    document.body.bgColor="yellow";
    </script>
    </body>
    </html>

Try it yourself

## Changing the Text HTML Element - innerHTML

The easiest way to get or modify the content of an element is by using the innerHTML property.

## Example 2 - Change the Text of an Element

The following example changes the text of the <p> element:

    <html>
    <body>
    <p id="p1">Hello World!</p>
    <script type="text/javascript">
    document.getElementById("p1").innerHTML="New text!";
    </script>
    </body>
    </html>

Try it yourself

## Changing an HTML Element Using Events

An event handler allows you to execute code when an event occurs.

Events are generated by the browser when the user clicks an element, when the page loads, when a form is submitted, etc.

You can read more about events in the next chapter.

## Example 3 - Change the Background Color Using the onclick Event

The following example changes the background color of the <body> element when the button is clicked:

    <html>
    <body>

    <input type="button" onclick="document.body.bgColor='yellow';"
    value="Click me to change background color">

    </body>
    </html>

Try it yourself

## Example 4 - Create a Function to Change the Text of an Element

The following example uses a function to change the text of the <p> element when the button is clicked:

    <html>
    <head>
    <script type="text/javascript">
    function ChangeText()
    {
    document.getElementById("p1").innerHTML="New text!";
    }
    </script>
    </head>

    <body>
    <p id="p1">Hello world!</p>
    <input type="button" onclick="ChangeText()"
    value="Click me to change text above">
    </body>
    </html>

Try it yourself

## Using the Style Object

The Style object represents of each HTML element represents its individual style.

The Style object can be accessed from the document or from the elements to which that style is applied.

## Example 5 - Change the Background Color

The following example uses a function to change the style of the <body> element when the button is clicked:

    <html>
    <head>
    <script type="text/javascript">
    function ChangeBackground()
    {
    document.body.style.backgroundColor="yellow";
    }
    </script>
    </head>

    <body>
    <p id="p1">Hello world!</p>
    <input type="button" onclick="ChangeBackground()"
    value="Click me to change background color">
    </body>
    </html>

Try it yourself

## Example 6 - Change the Text font and color of an Element

The following example uses a function to change the style of the <p> element when the button is clicked:

    <html>
    <head>
    <script type="text/javascript">
    function ChangeText()
    {
    document.getElementById("p1").style.color="blue";
    document.getElementById("p1").style.fontFamily="Arial";
    }
    </script>
    </head>

    <body>
    <p id="p1">Hello world!</p>
    <input type="button" onclick="ChangeText()"
    value="Click me to change text above">
    </body>
    </html>

Try it yourself

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