PHP+Mysql+jQuery实现发布微博程序 jQuery篇

该应用实现了即时统计输入字数，并且通过ajax与后台交互，将输入内容插入到话题列表中。我将整个流程分为两部分，本文讲解第一部分jquery实现前端交互操作。

首先查看示例：DEMO

XHTML

代码如下:

说说你正在做什么...

<BR><p> <BR><input type="image" src="images/btn.gif" class="sub_btn" alt="发布" /> <BR><span id="msg"></span> <BR></p> <BR></form> <BR><div class="clear"></div> <BR><div id="saywrap"> <BR><div class="saylist"> <BR><a href="#"><img src="images/user.gif" alt="" /></a> <BR><div class="saytxt"> <BR><p><h3><a href="#">Demo</a></h3>发布的内容...</p> <BR><div class="date"></div> <BR></div> <BR><div class="clear"></div> <BR></div> <BR></div> <BR></div> <BR>XHTML是一个表单，里面有输入框textarea，发布按钮，还有一个统计输入字数的span#counter，和信息提示span#msg,在没有输入的情况下就提交则会提示用户要求输入内容。 <BR>CSS <BR><div class="codetitle"><span><a style="CURSOR: pointer" data="37218" class="copybut" id="copybut37218" onclick="doCopy('code37218')"><U></U></a> <a href="https://www.jb51.cc/tag/daima/" target="_blank" class="keywords">代码</a>如下:</div><div class="codebody" id="code37218"> <BR>h3{height:32px; line-height:32px; font-size:18px} <BR>h3 span{float:right; font-size:32px; font-family:Georgia,serif; color:#ccc; overflow:hidden} <BR>.input{width:594px; height:58px; margin:5px 0 10px 0; padding:4px 2px; <BR>border:1px solid #aaa; font-size:12px; line-height:18px; overflow:hidden} <BR>.sub_btn{float:right; width:94px; height:28px;} <BR>#msg{color:#f30} <BR>.clear{clear:both} <BR>.saylist{margin:8px auto; padding:4px 0; border-b<a href="https://www.jb51.cc/tag/ott/" target="_blank" class="keywords">ott</a>om:1px d<a href="https://www.jb51.cc/tag/ott/" target="_blank" class="keywords">ott</a>ed #d3d3d3} <BR>.saylist img{float:left; width:50px; margin:4px} <BR>.saytxt{float:right; width:530px; overflow:hidden} <BR>.saytxt p{line-height:18px} <BR>.saytxt p h3{margin-right:6px} <BR>.date{color:#999} <BR></div> <BR>jQuery <BR>先引入jquery库和global.js<a href="https://www.jb51.cc/tag/wenjian/" target="_blank" class="keywords">文件</a>： <BR><div class="codetitle"><span><a style="CURSOR: pointer" data="15192" class="copybut" id="copybut15192" onclick="doCopy('code15192')"><U></U></a> <a href="https://www.jb51.cc/tag/daima/" target="_blank" class="keywords">代码</a>如下:</div><div class="codebody" id="code15192"> <BR><script type="text/javascript" src="../Script/jquery.js"></script> <BR><script type="text/javascript" src="./Script/global.js"></script> <BR></div> <BR>global.js<a href="https://www.jb51.cc/tag/wenjian/" target="_blank" class="keywords">文件</a>： <BR>global.js<a href="https://www.jb51.cc/tag/yaozuo/" target="_blank" class="keywords">要做</a>的事有： <BR>1、<a href="https://www.jb51.cc/tag/yonghu/" target="_blank" class="keywords">用户</a>输入、鼠标离开输入框时，<a href="https://www.jb51.cc/tag/tongji/" target="_blank" class="keywords">统计</a>输入的字符数，并根据输入字数的不同而<a href="https://www.jb51.cc/tag/shuchu/" target="_blank" class="keywords">输出</a>不同的样式（字体颜色）<a href="https://www.jb51.cc/tag/xianshi/" target="_blank" class="keywords">显示</a>在<a href="https://www.jb51.cc/tag/yemian/" target="_blank" class="keywords">页面</a>上。 <BR>2、处理提交数据：当点击“发布”按钮时，<a href="https://www.jb51.cc/tag/xianshi/" target="_blank" class="keywords">显示</a>等待<a href="https://www.jb51.cc/tag/tupian/" target="_blank" class="keywords">图片</a>，通过ajax想<a href="https://www.jb51.cc/tag/houtai/" target="_blank" class="keywords">后台</a>提交输入的数据，等待<a href="https://www.jb51.cc/tag/houtai/" target="_blank" class="keywords">后台</a>处理，并将处理结果<a href="https://www.jb51.cc/tag/shuchu/" target="_blank" class="keywords">输出</a>给前端<a href="https://www.jb51.cc/tag/yemian/" target="_blank" class="keywords">页面</a>。 <BR>具体<a href="https://www.jb51.cc/tag/daima/" target="_blank" class="keywords">代码</a>如下： <BR><div class="codetitle"><span><a style="CURSOR: pointer" data="54713" class="copybut" id="copybut54713" onclick="doCopy('code54713')"><U></U></a> <a href="https://www.jb51.cc/tag/daima/" target="_blank" class="keywords">代码</a>如下:</div><div class="codebody" id="code54713"> <BR>function recount(){ <BR>var maxlen=140; <BR>var current = maxlen-$('#saytxt').val().length; <BR>$('.counter').html(current); <BR>if(current<1 || current>maxlen){ <BR>$('.counter').css('color','#D40D12'); <BR>$('input.sub_btn').attr('<a href="https://www.jb51.cc/tag/dis/" target="_blank" class="keywords">dis</a>abled','<a href="https://www.jb51.cc/tag/dis/" target="_blank" class="keywords">dis</a>abled'); <BR>} <BR>else <BR>$('input.sub_btn').removeAttr('<a href="https://www.jb51.cc/tag/dis/" target="_blank" class="keywords">dis</a>abled'); <BR>if(current<10) <BR>$('.counter').css('color','#D40D12'); <BR>else if(current<20) <BR>$('.counter').css('color','#5C0002'); <BR>else <BR>$('.counter').css('color','#cccccc'); <BR>} <BR></div> <BR><a href="https://www.jb51.cc/tag/hanshu/" target="_blank" class="keywords">函数</a>recount()完成了输入字符的<a href="https://www.jb51.cc/tag/tongji/" target="_blank" class="keywords">统计</a>，并根据输入的字符数，<a href="https://www.jb51.cc/tag/xianshi/" target="_blank" class="keywords">显示</a>不同的字体颜色。 <BR><div class="codetitle"><span><a style="CURSOR: pointer" data="36150" class="copybut" id="copybut36150" onclick="doCopy('code36150')"><U></U></a> <a href="https://www.jb51.cc/tag/daima/" target="_blank" class="keywords">代码</a>如下:</div><div class="codebody" id="code36150"> <BR>$(function(){ <BR>$('#saytxt').bind("blur focus keydown keypress keyup",function(){ <BR>recount(); <BR>}); <BR>$("#myform").submit(function(){ <BR>var saytxt = $("#saytxt").val(); <BR>if(saytxt==""){ <BR>$("#msg").show().html("你总得说点什么吧.").fadeOut(2000);; <BR>return false; <BR>} <BR>$('.counter').html('<img style="padding:8px" src="images/load.gif" alt="正在处理..." />'); <BR>$.ajax({ <BR>type: "POST",<BR>url: "submit.<a href="https://www.jb51.cc/tag/PHP/" target="_blank" class="keywords">PHP</a>",<BR>data:"saytxt="+saytxt,<BR>dataType: "html",<BR>success: function(msg){ <BR>if(parseInt(msg)!=0){ <BR>$('#saywrap').prepend(msg); <BR>$('#saytxt').val(''); <BR>recount(); <BR>}else{ <BR>$("#msg").show().html("<a href="https://www.jb51.cc/tag/xitongcuowu/" target="_blank" class="keywords">系统错误</a>.").fadeOut(2000); <BR>return false <BR>} <BR>} <BR>}); <BR>return false; <BR>}); <BR>}); <BR></div> <BR>提交数据给<a href="https://www.jb51.cc/tag/houtai/" target="_blank" class="keywords">后台</a>后，由submit.<a href="https://www.jb51.cc/tag/PHP/" target="_blank" class="keywords">PHP</a>进行处理，关于<a href="https://www.jb51.cc/tag/houtai/" target="_blank" class="keywords">后台</a>的处理程序，我在<a href="https://www.jb51.cc/tag/xiayipian/" target="_blank" class="keywords">下一篇</a><a href="https://www.jb51.cc/tag/wenzhang/" target="_blank" class="keywords">文章</a>会重点讲解，敬请关注。 </P><div class="topcard-tags"><a href="https://m.jb51.cc/tag/fabuweibo/" class="tag_link" target="_blank">发布微博</a></div> </div> </div> </div> <!-- row end--> <div class="clearfix"></div> <!-- row --> <div class="col-sm-12 col-md-12 col-lg-12"> <div class="card"> <div class="title"><h1>相关文章</h1></div><div class="list_con"> <div class="title"> <a href="https://m.jb51.cc/php/4739043.html" title="vue+thinkphp5实现微信扫码支付(NATIVE支付)">vue+thinkphp5实现微信扫码支付(NATIVE支付)</a> </div> <div class="summary">统一支付是JSAPI/NATIVE/APP各种支付场景下生成支付订单，返...</div> </div><div class="list_con"> <img src="https://m.jb51.cc/res/2024/07-30/10/32d06eca1830b39e35547ff639b7b95b.png" width="100" height="64" style="float:right;margin-left:20px;" /> <div class="title"> <a href="https://m.jb51.cc/php/4739042.html" title="uniapp+thinkphp5实现微信扫码支付(APP支付)">uniapp+thinkphp5实现微信扫码支付(APP支付)</a> </div> <div class="summary">统一支付是JSAPI/NATIVE/APP各种支付场景下生成支付订单，返...</div> </div><div class="list_con"> <img src="https://m.jb51.cc/res/2024/07-30/10/3d907355e295604aef536bba5b45dd7d.png" width="100" height="64" style="float:right;margin-left:20px;" /> <div class="title"> <a href="https://m.jb51.cc/php/4739041.html" title="uniapp+thinkphp5实现微信登录">uniapp+thinkphp5实现微信登录</a> </div> <div class="summary">前言 之前做了微信登录，所以总结一下微信授权登录并获取用户...</div> </div><div class="list_con"> <img src="https://m.jb51.cc/res/2024/07-30/10/fc29e4e4eba385bc042444571f518ef6.png" width="100" height="64" style="float:right;margin-left:20px;" /> <div class="title"> <a href="https://m.jb51.cc/php/4739040.html" title="【PHP】关于fastadmin框架中使用with进行连表查询时setEagerlyType字段的理解">【PHP】关于fastadmin框架中使用with进行连表查询时setEagerlyType字段的理解</a> </div> <div class="summary">FastAdmin是我第一个接触的后台管理系统框架。FastAdmin是一...</div> </div><div class="list_con"> <img src="https://m.jb51.cc/res/2024/07-30/10/e6971fb86d3ee30a4466e87826da43d8.png" width="100" height="64" style="float:right;margin-left:20px;" /> <div class="title"> <a href="https://m.jb51.cc/php/4739039.html" title="【workerman】uniapp+thinkPHP5使用GatewayWorker实现实时通讯">【workerman】uniapp+thinkPHP5使用GatewayWorker实现实时通讯</a> </div> <div class="summary">之前公司需要一个内部的通讯软件，就叫我做一个。通讯软件嘛...</div> </div><div class="list_con"> <div class="title"> <a href="https://m.jb51.cc/php/4739038.html" title="uniapp+thinkphp5实现微信支付(JSAPI支付)">uniapp+thinkphp5实现微信支付(JSAPI支付)</a> </div> <div class="summary">统一支付是JSAPI/NATIVE/APP各种支付场景下生成支付订单，返...</div> </div></div> </div> <!-- row end--> </div> </div> <footer id="footer"> <div class="container"> <div class="copyright"> Copyright © 2018 编程之家. 当前版本 V7.0.16<br> <span class="ml5">编程之家 版权所有 <a href="https://beian.miit.gov.cn/" target="_blank" rel="nofollow">闽ICP备13020303号-8</a> </div> </div> </footer> <script> (function () { var bp = document.createElement('script'); 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