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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>JS Events</title>
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<body>
<h1>JS Events</h1>
<img src="images/js events.png" alt="js events image" />
<img src="images/js events 2.png" alt="js events image" />
<p>
The change in the state of an object is known as an Event. In html, there
are various events which represents that some activity is performed by the
user or by the browser. When javascript code is included in HTML, js react
over these events and allow the execution. This process of reacting over
the events is called Event Handling. Thus, js handles the HTML events via
Event Handlers.
</p>
<p>
For example, when a user clicks over the browser, add js code, which will
execute the task to be performed on the event.
</p>
<p>Some of the HTML events and their event handlers are:</p>
<h1>Mouse events:</h1>
<table class="table table-bordered table-striped">
<tbody>
<tr>
<th>Event Performed</th>
<th>Event Handler</th>
<th>Description</th>
</tr>
<tr>
<td>click</td>
<td>onclick</td>
<td>When mouse click on an element</td>
</tr>
<tr>
<td>mouseover</td>
<td>onmouseover</td>
<td>When the cursor of the mouse comes over the element</td>
</tr>
<tr>
<td>mouseout</td>
<td>onmouseout</td>
<td>When the cursor of the mouse leaves an element</td>
</tr>
<tr>
<td>mousedown</td>
<td>onmousedown</td>
<td>When the mouse button is pressed over the element</td>
</tr>
<tr>
<td>mouseup</td>
<td>onmouseup</td>
<td>When the mouse button is released over the element</td>
</tr>
<tr>
<td>mousemove</td>
<td>onmousemove</td>
<td>When the mouse movement takes place.</td>
</tr>
</tbody>
</table>
<h1>Keyboard events:</h1>
<table class="table table-bordered table-striped">
<tbody>
<tr>
<th>Event Performed</th>
<th>Event Handler</th>
<th>Description</th>
</tr>
<tr>
<td>Keydown & Keyup</td>
<td>onkeydown & onkeyup</td>
<td>When the user press and then release the key</td>
</tr>
</tbody>
</table>
<h1>Form events:</h1>
<table class="table table-bordered table-striped">
<tbody>
<tr>
<th>Event Performed</th>
<th>Event Handler</th>
<th>Description</th>
</tr>
<tr>
<td>focus</td>
<td>onfocus</td>
<td>When the user focuses on an element</td>
</tr>
<tr>
<td>submit</td>
<td>onsubmit</td>
<td>When the user submits the form</td>
</tr>
<tr>
<td>blur</td>
<td>onblur</td>
<td>When the focus is away from a form element</td>
</tr>
<tr>
<td>change</td>
<td>onchange</td>
<td>When the user modifies or changes the value of a form element</td>
</tr>
</tbody>
</table>
<pre
class="language-markup"
tabindex="0"
><code class="language-markup"><span class="token doctype"><span class="token punctuation"><!</span><span class="token doctype-tag">DOCTYPE</span> <span class="token name">html</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>html</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>head</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>title</span><span class="token punctuation">></span></span>JavaScript<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>title</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>script</span><span class="token punctuation">></span></span><span class="token script"><span class="token language-javascript">
<span class="token keyword">function</span> <span class="token function">hello</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token function">alert</span><span class="token punctuation">(</span><span class="token string">"Hello Everybody"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>script</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>head</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>body</span> <span class="token special-attr"><span class="token attr-name">onresize</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span><span class="token value javascript language-javascript"><span class="token function">hello</span><span class="token punctuation">(</span><span class="token punctuation">)</span></span><span class="token punctuation">"</span></span></span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>button</span> <span class="token special-attr"><span class="token attr-name">onclick</span> <span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span><span class="token value javascript language-javascript"><span class="token function">hello</span><span class="token punctuation">(</span><span class="token punctuation">)</span></span><span class="token punctuation">"</span></span></span><span class="token punctuation">></span></span>Click Me<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>button</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>p</span> <span class="token special-attr"><span class="token attr-name">ondblclick</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span><span class="token value javascript language-javascript"><span class="token function">hello</span><span class="token punctuation">(</span><span class="token punctuation">)</span></span><span class="token punctuation">"</span></span></span><span class="token punctuation">></span></span>Double Click on Me<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>p</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>p</span> <span class="token special-attr"><span class="token attr-name">onmouseenter</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span><span class="token value javascript language-javascript"><span class="token function">hello</span><span class="token punctuation">(</span><span class="token punctuation">)</span></span><span class="token punctuation">"</span></span></span><span class="token punctuation">></span></span>On Mouse Enter<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>p</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>p</span> <span class="token special-attr"><span class="token attr-name">onmouseout</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span><span class="token value javascript language-javascript"><span class="token function">hello</span><span class="token punctuation">(</span><span class="token punctuation">)</span></span><span class="token punctuation">"</span></span></span><span class="token punctuation">></span></span>On Mouse Out<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>p</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>body</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>html</span><span class="token punctuation">></span></span></code></pre>
</body>
</html>