jquery+php implements automatic prompts when users enter search content_PHP tutorial

Today I suddenly wanted to make a search page for this site, so that users can find their favorite content through search, and also avoid the trouble of manually finding resources in massive information. My goal is the effect of Baidu homepage Similarly, when the user enters the text to be searched, 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. Mainly I just want to be 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!

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, a search button, and a layer that displays search prompts on the page, as shown in the following code

<div id="search"> <br> <input type="text" name="k" class="k"> <input type="button" name="s" value="搜索"><br> </div> <br> <div id="search_auto"></div>

Use the browser to browse the page, and you will see the effect below

It looks very ordinary and has no style. Now let’s make some adjustments to the style

#search{font-size:14px;}<br> #search .k{padding:2px 1px; width:320px;} /*将搜索框宽度设置大点*/

Then 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

　#search_auto{border:1px solid #817FB2; position:absolute;} /*Set the border and 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 the problem

　$(#search_auto).css({width:$(#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

$(#search input[name="k"]).keyup(function(){<br> $.post(search_auto.php,{value:$(this).val()},function(data){　 //向服务器上的search_auto.php发送post数据，$.post是jQuery的方法<br> if(data==0) $(#search_auto).html().css(display,none);　 //判断服务器上返回的数据，如果等于０，则表示没有找到相关的内容，所以将提示框的内容清空并隐藏<br> else $(#search_auto).html(data).css(display,block);　 //如果服务器上返回的数据不等于０，则将返回的内容放到提示框内并显示提示框<br> });<br> });

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

<?php <br /> $v=$_POST[value];<br> $re=mysql_query("select * from test where title like %$v% order by addtime desc limit 10");　 //根据客户端发送来的数据，到数据库中查询10条相关的结果<br> if(mysql_num_rows($re) echo <ul>;<br> while($ro=mysql_fetch_array($re)) echo <li><a href="">.$ro[title].</a></li>;　 //将查询得到的相关结果的标题输出，这个地方需要注意，由于通过jQuery的ajax技术返回的文本是UTF-8编码，所以如果$ro[title] 中包含中文，一定要记得用PHP的iconv或其它函数将其转换成UTF-8编码，否则在页面中看到的会是一串乱码<br> echo <li class="cls"> <a href="javascript:;" onclick="$(this).parent().parent().parent().fadeOut(100)">关闭</a>& gt;</li>;　 //输入一个关闭按钮，让用户不想看到提示层时可以点击关闭，关闭按钮采用jQuery，解释一下，当前点击的按钮是$(this)，一直向上找到其第三个父元素，让它逐渐消失<br> echo </ul>;<br> ?>

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

#search_auto li{background:#FFF; text-align:left;} /*设置提示框内的li标签效果*/<br> #search_auto li.cls{text-align:right;} /*设置提示框内的关闭按钮效果*/<br> #search_auto li a{display:block; padding:5px 6px; cursor:pointer; color:#666;} /*设置提示框内li标签下的a标签效果*/<br> #search_auto li a:hover{background:#D8D8D8; text-decoration:none; color:#000;} /*当鼠标移入提示框内时的效果*/

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:








<div id="search"> <br> <input type="text" name="k" class="k"> <input type="button" name="s" value="搜索"><br> </div> <br> <div id="search_auto"></div>




<script><br /> $(function(){<br /> <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 /> });<br /> </script>

Server-side complete code:

<?php <br /> $v=$_POST[value];<br> $re=mysql_query("select * from test where title like %$v% order by addtime desc limit 10");<br> if(mysql_num_rows($re) echo <ul>;<br> while($ro=mysql_fetch_array($re)) echo <li><a href="">.$ro[title].</a></li>;<br> echo <li class="cls"> <a href="javascript:;" onclick="$(this).parent().parent().parent().fadeOut(100)">关闭</a>& gt;</li>;<br> echo </ul>;<br> ?>

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