jquery php implements search box automatic prompt_jquery

Today I suddenly want to build a search page for this site, so that users can find their favorite content through search, and avoid the trouble of manually finding resources in massive information. My goal is similar to the effect of Baidu homepage. When the user enters the text they want to search for, we provide ten relevant pieces of information below. If the user is looking for one of these ten pieces of information, it is simple. Just click to open the page in a new page. The main reason is to update the page. Make it more user-friendly and make it more convenient for users to use.

Let’s take a look at the renderings first. This will give you more motivation, otherwise you won’t know what I’m talking about and what effect I want to achieve!

jquery php implements automatic prompting of search box

The following mainly explains the principle:

In the search.html page, when the user enters "j" in the search box, use javascript to obtain the text content of the search box, search for relevant content in the database and return it, and then use javascript to display the results returned by the server in The prompt box below the search box is for users to make reference choices.

Specific implementation method:

First, create a search box, search button, and search prompt layer on the page, as shown below

Copy code The code is as follows:

Use the browser to browse the page and you will see the effect as shown below
jquery php implements automatic prompts when users enter search content
It looks very ordinary and has no style. Now let’s make some adjustments to the style

Copy code The code is as follows:

#search{font-size:14px;}
#search .k{padding:2px 1px; width:320px;} /*Set the search box width larger*/

Adjust the style of the layer that displays the search prompt. Since the search prompt layer is directly below the search box, we set its positioning method to absolute positioning

Positioning method*/
Then use JS to place the search prompt layer directly below the search box, and the width is the same as the search box. Here we use jQuery to solve it

Copy code The code is as follows:

$('#search_auto').css({'width':$('#search input[name="k"]').width() 4});

The position and width of the search prompt layer have been determined. Since the prompt box will not be displayed before the user enters the search text, we first need to set it to hidden and add display to the style of the prompt layer: none hides it.

Everything is OK. Now we only need to register the event for the onkeyup of the search box. We still use jQuery to handle it. In jQuery, it is keyup

Copy code The code is as follows:

$('#search input[name="k"]').keyup(function(){
$.post('search_auto.php',{'value':$(this).val()},function(data){ //Send post data to search_auto.php on the server, $.post is a jQuery method
if(data=='0') $('#search_auto').html('').css('display','none'); //Judge the data returned on the server. If it is equal to 0, it means there is none Found relevant content, so clear and hide the contents of the prompt box
else $('#search_auto').html(data).css('display','block'); //If the data returned on the server is not equal to 0, put the returned content into the prompt box and display the prompt Box
});
});

The above client has been completed and can send the user input to the server and respond to the server's return value.
So how does the server process the data sent by the client? Let’s use PHP as an example

Copy code The code is as follows:

$v=$_POST[value];
$re=mysql_query("select * from test where title like '%$v%' order by addtime desc limit 10"); //Query 10 related results in the database based on the data sent by the client
if(mysql_num_rows($re)<=0) exit('0'); //Judge the query result. If there is no relevant result, then return 0
directly echo '

';
while($ro=mysql_fetch_array($re)) echo '
• '.$ro[title].'
'; //Will The title output of the relevant results obtained by the query needs to be noted. Since the text returned through jQuery's ajax technology is UTF-8 encoded, if $ro[title] contains Chinese, you must remember to use PHP's iconv or other functions. Convert it to UTF-8 encoding, otherwise what you see on the page will be a string of garbled characters
echo '
• Close '; //Enter a close button so that users can click to close it when they don’t want to see the prompt layer. The close button uses jQuery. To explain, the button currently clicked is $(this), Go all the way up to its third parent element and make it disappear
  echo '

';
?>

Now the server can correctly execute the data we sent and return the corresponding results. Now enter a text in the search box to test it, but the premise is that there must be something related to this text in your database. content, otherwise you wouldn’t see the prompt box appear because there is no relevant prompt content, haha.

But there is still a slight flaw, that is, the content in the prompt box is not beautiful. Compared with the prompt box we saw in Baidu search, it is simply too ugly. Haha, don’t worry, we will use css to adjust the display. The effect of

Copy code The code is as follows:

#search_auto li{background:#FFF; text-align:left;} /*Set the li tag effect in the prompt box*/
#search_auto li.cls{text-align:right;} /*Set the close button effect in the prompt box*/
#search_auto li a{display:block; padding:5px 6px; cursor:pointer; color:#666;} /*Set the a label effect under the li label in the prompt box*/
#search_auto li a:hover{background:#D8D8D8; text-decoration:none; color:#000;} /*The effect when the mouse moves into the prompt box*/

Now it is truly fully completed. As for whether to set up a delay processing or other more complete functions, it is left to friends to use their own brains. You can also reply to your thoughts below, etc.
Complete client code:

Copy code The code is as follows:

<script><br> $(function(){<br> $('#search_auto').css({'width':$('#search input[name="k"]').width() 4});<br> $('#search input[name="k"]').keyup(function(){<br> $.post('search_auto.php',{'value':$(this).val()},function(data){<br> if(data=='0') $('#search_auto').html('').css('display','none');<br> else $('#search_auto').html(data).css('display','block');<br> });<br> });<br> });<br> </script>

Complete server-side code:

Copy code The code is as follows:

$v=$_POST[value];
$re=mysql_query("select * from test where title like '%$v%' order by addtime desc limit 10");
if(mysql_num_rows($re)<=0) exit('0');
echo '

';
while($ro=mysql_fetch_array($re)) echo '
• '.$ro[title].'
';
echo '
• Close ';
  echo '

';
?>

It is a very practical function, and it is very good at improving user experience and friendliness. Friends can combine this article with free play and add it to their own projects.