Các bước thực hiện như sau:
Bước 1: Chèn đoạn mã này vào giữa 2 thẻ head
<style type='text/css'>
#searchForm {
display:inline-block;
position:relative;
width:500px;
}
#searchForm input {
background:transparent;
font-size:14px;
line-height:27px;
text-indent:14px;
width:90%;
color:#212121;
border:1px solid #e0e0e0;
border-right:none;
border-radius:2px 0 0 2px;
outline:0;
}
#searchForm input:hover,
#searchForm button:hover {
border:1px solid #b9b9b9;
border-top:1px solid #a0a0a0;
-webkit-box-shadow:inset 0 1px 2px rgba(0,0,0,.1);
-moz-box-shadow:inset 0 1px 2px rgba(0,0,0,.1);
box-shadow:inset 0 1px 2px rgba(0,0,0,.1);
}
#searchForm button {
width:60px;
border:1px solid #e0e0e0;
border-radius:0 2px 2px 0;
background:rgb(230,230,230);
cursor:pointer;
position:absolute;
top:10px;
outline:0;
line-height:27px;
}
#searchForm button svg {
vertical-align:middle;
width:21px;
height:21px;
}
#searchForm .results {
position:absolute;
top:50px;
background:#fff;
border:1px solid #e0e0e0;
width:90%;
min-width:320px;
border-top:unset;
box-shadow:0 2px 4px rgba(0,0,0,0.2);
-webkit-box-shadow:0 2px 4px rgba(0,0,0,0.2);
}
#searchForm .results li {
line-height:list-style:none;
}
#searchForm .results li a {
display:block;
padding:0 15px;
color:#212121;
font-size:15px;
font-weight:500;
line-height:30px;
white-space:nowrap;
overflow:hidden;
text-overflow:ellipsis;
}
#searchForm .results li:hover {
background:rgb(230,230,230);
}
#searchForm .hidden {
display:none!important;
}
</style>
<script src='https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js'></script>
Bước 2: Mọi người tiếp tục chèn đoạn code này vào 2 thẻ body<form id="searchForm" action="/search">
<input autocomplete="off" name="q" placeholder="Search" value=""/>
<svg class="clear-text hidden"><use xlink:href="/responsive/sprite_v1_6.css.svg#ic_close_black_24dp" xmlns:xlink="http://www.w3.org/1999/xlink"></use></svg>
<button type="submit" value="Search"><svg><use xlink:href="/responsive/sprite_v1_6.css.svg#ic_search_black_24dp" xmlns:xlink="http://www.w3.org/1999/xlink"></use></svg></button>
<ul class="results hidden"></ul>
</form>
<script>//<![CDATA[
$(window).on('load', function() {
$('#searchForm input').on('keyup', function(e) {
var textinput = $(this).val()
if (textinput) {
$.ajax({
type: 'GET',
url: '/feeds/posts/summary',
data: {
'max-results': 10,
'alt': 'json',
'q': textinput
},
dataType: 'jsonp',
success: function(data) {
$('.results,.clear-text').removeClass('hidden')
$('.results').empty()
if (data.feed.entry) {
for (var i = 0; i < data.feed.entry.length; i++) {
for (var j = 0; j < data.feed.entry[i].link.length; j++) {
if (data.feed.entry[i].link[j].rel == 'alternate') {
var postUrl = data.feed.entry[i].link[j].href;
break;
}
}
var postTitle = data.feed.entry[i].title.$t;
$('.results').append('<li><a href=' + postUrl + ' title="' + postTitle + '">' + postTitle + '</li>');
}
} else {
$('.results').addClass('hidden')
}
}
})
} else {
$('.results,.clear-text').addClass('hidden')
}
})
$('.clear-text').click(function() {
$('#searchForm input').val('')
$('.results,.clear-text').addClass('hidden')
$('.results').empty()
})
})
//]]></script>