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Ajax combined with Douban search results for paging complete code

韦小宝
韦小宝Original
2017-12-30 20:12:112200browse

This article mainly introduces in detail the complete code of ajax combined with Douban search results for paging. It has a certain reference value for learning ajax. Friends who are interested in ajax can refer to

Using Douban API, Get paginated results. Equivalent to the results obtained from the backend database. The difference is that there is no way to know the number of pages in advance. Although the total page count can be obtained by requesting the API, since Ajax is asynchronous, it does not make sense to give the total page count at the beginning of pagination. I used a fixed total page count of 65 (exactly the total number of pages returned by searching for javascript books). Therefore, other books are not 65 pages. There will be more or less pages. This is not a bug.

Features

1. There is no need to touch the backend in the whole process, the front-end can be independent (I have been looking for a complete example for a long time).
　2. Use bootstrap's pagination to create page numbers and panel to create a panel for placing results.

The code is as follows


##

<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8">
    <title></title>
    <link rel="stylesheet" href="css/bootstrap.css" /><!-- 换成自己的目录 -->
    <meta name="viewport" content="width=device-width,initial-scale=1,user-scalable=no" />
  </head>
  <style>
   .pagination> li > a {
    cursor: pointer;
   }
   .pagination > li > span {
    margin-left: 0;
    color: #ccc;
    background-color: transparent;
    cursor: default;
   }
   .pagination > li > span:hover {
   color: #ccc;  
   background-color: transparent;
   cursor: default; 
   }
   .m20 {
    margin: 20px 0;
   }

  </style>
  <body>

   <p class="container-fluid">

    <p class="col-md-12">
     <p class="panel panel-default">
      <p class="panel-heading">
       <form class="input-group">
        <input type="text" value="javascript" class="form-control" id="bookName" placeholder="请输入书名" required="required"/>
        <span class="input-group-btn">
         <button class="btn" id="search">搜索</button>
        </span>
       </form>
      </p>
      <p class="panel-body">
       <table class="table table-bordered">
        <thead>
         <th>书名</th>
         <th>作者</th>
         <th>出版日期</th>
         <th>平均分</th>
         <th>价格</th>
        </thead>
        <tbody id="tbody">

        </tbody>
       </table>
      </p>
     </p>

    <p class="row">
     <p class="col-md-6">
      <p id="test"></p>
     </p>

     <p class="col-md-4">
      <p class="input-group m20"><!-- 保持与#test中的.pagination对齐 -->
       <input type="text" class="form-control" id="page"/>
       <span class="input-group-btn">
        <button class="btn btn-default" id="jumpToPage">GO</button>
       </span>
      </p>
     </p>
    </p>

    <p id="result" class="alert alert-info"></p>
    </p>
   </p>


 <script type="text/javascript" src="js/jquery-1.11.2.min.js" ></script> <!-- 换成自己的目录 -->
 <script type="text/javascript" src="js/bootstrap.js" ></script> <!-- 换成自己的目录 -->
 <script type="text/javascript">
  var partPageModule = ( function ( $ ) {
   var 
    initPager = null,// 初始换分页函数
    setPagerHTML = null,// 生成分的页HTML代码
    pageClick = null,//　每一页按钮的点击事件
    ajax = null, // ajax请求后台数据
    renderButton = null,
    $content = $( &#39;&#39; ) // 动态生成的页码
   ;


   /* 功能：完成初始化
    * @totalPages 总页数，从后端获取
    * @currentPage 当前所在的页数
    */
   initPager = function ( totalPages, currentPage ) {
    $content = setPagerHTML({
     currentPage: currentPage,
     totalPages: totalPages,
     pageClick: PageClick
    })
    $( &#39;#test&#39; ).empty().append( $content );// 得到分页后添加到#test
    $( &#39;#jumpToPage&#39; ).click( function ( e ) {// 绑定GO按钮的点击事件
     e.preventDefault();
     PageClick( totalPages, $(&#39;#page&#39;).val() * 1);
    })
    $( &#39;#page&#39; ).keyup( function ( e ) {// Enter键绑定搜索事件
     if ( e.keyCode === 13 ) {
      $( &#39;#jumpToPage&#39;).trigger( &#39;click&#39; );
     }
    })
    $( &#39;#result&#39; ).html( &#39;你点击的是第&#39; + currentPage + &#39;页&#39;)
   };

   /* 功能：页码点击事件。重新生成所有页码，并且使用ajax获取数据
    */
   PageClick = function ( totalPages, currentPage ) {
    initPager( totalPages, currentPage );
    ajax( currentPage );// 使用jsonp请求豆瓣
   }

   ajax = function ( currentPage ) {
    var 
     $input = $( &#39;#bookName&#39; ),
     bookName = &#39;&#39;,
     $tbody = $( &#39;#tbody&#39; )
//    totalPages
    ;

    bookName = $input.val();

    if ( !bookName ) { // 如果没有输入，就不要发送请求了
     $input.focus();
     return;
    } else {
     $.ajax({
      type: &#39;get&#39;,
      url: &#39;https://api.douban.com/v2/book/search&#39;,// 豆瓣图书api
      dataType: &#39;jsonp&#39;,
      data: {
       q: bookName,
       start: ( parseInt( currentPage )-1 )*20 || 0
      },
      success: function ( data ) {
       var 
        html = &#39;&#39;,
        books = data.books
       ;

//      totalPages = Math.ceil( data.total / data.count );

       books.forEach( function ( value, index ) {
        html += &#39;<tr>&#39;
           + &#39;<td><a href="&#39; + value.alt + &#39;">&#39; + value.title + &#39;</a></td>&#39;
           + &#39;<td>&#39; + value.author + &#39;</td>&#39;
           + &#39;<td>&#39; + value.pubdate + &#39;</td>&#39;
           + &#39;<td>&#39; + value.rating.average + &#39;</td>&#39;
           + &#39;<td>&#39; + value.price + &#39;</td>&#39;
           + &#39;</tr>&#39;; 
       })

       $tbody.html( html );
      }
     })
    }

//   return totalPages;
   }

   setPagerHTML = function ( options ) {
    var 
     currentPage = options.currentPage,
     totalPages = options.totalPages,
     pageClick = options.pageClick,
     $content = $(&#39;<ul class="pagination"></ul>&#39;),
     startPage = 1,
     nextPage = currentPage + 1,//不需要考虑超出问题，后面有条件
     prevPage = currentPage - 1
    ;

    /* 逻辑处理，根据点击的不同的页生成不同的ul */
    if ( currentPage == startPage ) {//当前页是起始页
     $content.append( &#39;<li><span>首页</span></li>&#39; ); // 首页不可用
     $content.append( &#39;<li><span>上一页</span></li>&#39; ); // 上一页不可用
    } else { // 不是起始页
     $content.append( renderButton( totalPages, 1, pageClick, &#39;首页&#39;) ); // 生成首页并绑定事件
     $content.append( renderButton( totalPages, prevPage, pageClick, &#39;上一页&#39;) ); // 生成上一页并绑定事件
    }

    if ( totalPages <=5 && currentPage <= 5 ) {// 总页数小于5，当前页小于5，全部生成页码
     for ( var i = 1; i <= totalPages; i++ ) {
      if( i === currentPage ) {
       $content.append( &#39;<li class="active><span>&#39; + i + &#39;</span></li>&#39; );// 当前页不可点击
      } else {
       $content.append( renderButton( totalPages, i, pageClick, i) );// 其他页可以点击
      }
     }
    } else if ( totalPages > 5 && totalPages - currentPage <= 2 ) {// 总页数大于5，当前页接近总页数，前面显示...,后面显示到结尾的页码
     $content.append( &#39;<li><span>...</span></li>&#39; );
     for( var i = totalPages - 4; i <= totalPages; i++ ) {
      if ( i === currentPage ) {
       $content.append( &#39;<li class="active"><span>&#39; + i + &#39;</span></li>&#39; );
      } else {
       $content.append( renderButton( totalPages, i, pageClick, i) );
      }
     }
    } else if ( totalPages > 5 && currentPage > 3) {// 总页数大于5，当前页在中间，前后生成...，生成中间页码
     $content.append( &#39;<li><span>...</span></li>&#39; );
     for ( var i = currentPage - 2; i < currentPage + 2; i++ ) {
      if ( i === currentPage ) {
       $content.append( &#39;<li class="active"><span>&#39; + i + &#39;</span></li>&#39; );
      } else {
       $content.append( renderButton( totalPages, i ,pageClick, i) );
      }
     }
     $content.append( &#39;<li><span>...</span></li>&#39; );
    } else if ( totalPages > 5 && currentPage <= 3 ) {// 总页数大于5，当前页接近第一页，显示前面页码，后面显示...
     for ( var i = 1; i <= 5; i++ ) {
      if ( i === currentPage ) {
       $content.append( &#39;<li class="active"><span>&#39; + i + &#39;</span></li>&#39; );
      } else {
       $content.append( renderButton( totalPages, i ,pageClick, i) );
      }
     }
     $content.append( &#39;<li><span>...</span></li>&#39; );
    }

    if ( currentPage == totalPages ) {//当前页是末页
     $content.append( &#39;<li><span>下一页</span></li>&#39; ); // 下一页不可用
     $content.append( &#39;<li><span>末页</span></li>&#39; ); // 末页不可用
    } else { // 不是起始页
     $content.append( renderButton( totalPages, nextPage, pageClick, &#39;下一页&#39;) ); // 生成首页并绑定事件
     $content.append( renderButton( totalPages, totalPages, pageClick, &#39;末页&#39;) ); // 生成上一页并绑定事件
    }

    return $content;
   }

   renderButton = function ( totalPages, goPageIndex, eventHander, text ) {
    var $gotoPage = $( &#39;<li><a title="第&#39; + goPageIndex + &#39;页">&#39; + text + &#39;</a></li>&#39; );
    $gotoPage.click( function () {
     eventHander( totalPages, goPageIndex );
    })

    return $gotoPage;
   }


   return {
    init: initPager,
    ajax: ajax
   }　
  }(jQuery))

  $( function () {


   $( &#39;#search&#39; ).click( function ( e ) {
    e.preventDefault();
    var totalPage = partPageModule.ajax(1);// 由于ajax是异步的，
    totalPage = totalPage || 65;// 所以这个总页数是不准确的。一般这个数据是后端返回的。这里的65是javascript搜索的页数，不同的书籍搜索结果不一样，由于ajax异步执行，所以这里会默认为65。这里不是bug。
    partPageModule.init( totalPage, 1 );
   })

   $( &#39;#bookName&#39; ).keyup( function ( e ) {
    if ( e.keyCode === 13 ) {
     $( &#39;#search&#39; ).trigger( &#39;click&#39; );
    }
   })

   $( &#39;#search&#39; ).trigger( &#39;click&#39; );
  })
 </script>
  </body>
</html>
<!-- https://api.douban.com/v2/book/search -->
<!--
 参数    意义        备注
 q    查询关键字      q和tag必传其一
 tag   查询的tag      q和tag必传其一
 start  取结果的offset   默认为0
 count  取结果的条数     默认为20，最大为100
-->


The above is all the content of this chapter, I hope it will be helpful to everyone Helps!


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