jQuery event when select option

<select id='list'>
<option value='1'>Option A</option>
<option value='2'>Option B</option>
<option value='3'>Option C</option>
</select>

<script>
$(document).ready(function(){
$('#list').change(function() {
    if ($(this).val() === '2') {
        // Do something for option "b"
    }
});
});
</script>

On click scroll to div

Jquery Smooth Scroll To DIV - Using ID value from Link

Ids are meant to be unique, and never use an id that starts with a number, use data-attributes instead to set the target like so :

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>

<div id="searchbycharacter">
    <a class="searchbychar" href="#" data-target="numeric" onclick="return false">0-9 |</a> 
    <a class="searchbychar" href="#" data-target="A" onclick="return false"> A |</a> 
    <a class="searchbychar" href="#" data-target="B" onclick="return false"> B |</a> 
    <a class="searchbychar" href="#" data-target="C" onclick="return false"> C |</a> 
    ... Untill Z
</div>


/*-----where data-target="this is your div id name" ------*/ 

/*-----start making your divisions below --------*/

<div id="A">
    <p>some content</p>
</div>

<div id="B">
    <p>some content</p>
</div>

<div id="C">
    <p>some content</p>
</div>

... Untill Z

As for the jquery :

$( '.searchbychar' ).on('click', function(event) {
    event.preventDefault();
    var target = "#" + $(this).data('target');
    $('html, body').animate({
        scrollTop: $(target).offset().top
    }, 2000);
});

Alert and redirect in php

<?php
{
$message= "this is an alert after this page will redirect to next page";
echo "<script type='text/javascript'>
window.alert('$message');
window.location.href='http://google.com';
</script>";
}
?>

How to close current browser window in html ?

<input type="button" value="Close" onclick="javascript:var win = window.open('','_self');win.close();return false;"/></form> Only this method is working in all browsers instead window.close() method though which you can close browser window or current tab.