2016-03-03 76 views
6

我正在嘗試分頁顯示數據。目前的記錄總數是19,我想最初顯示3條記錄。分頁:未捕獲TypeError:無法設置null'propertyName'的屬性

這是我的分頁代碼:

// Instantiate pagination after data is available  
pager = new Pager('results', 3); 
pager.init(); 
pager.showPageNav('pager', 'pageNavPosition'); 
pager.showPage(1); 

// pagination object codes. 
function Pager(tableName, itemsPerPage) { 
    this.tableName = tableName; 
    this.itemsPerPage = itemsPerPage; 
    this.currentPage = 1; 
    this.pages = 0; 
    this.inited = false; 

    this.showRecords = function (from, to) { 
     var rows = total_records; 
     // i starts from 1 to skip table header row 
     for (var i = 1; i < rows.length; i++) { 
      if (i < from || i > to) rows[i].style.display = 'none'; 
      else rows[i].style.display = ''; 
     } 
    } 

    this.showPage = function (pageNumber) { 



     if (!this.inited) { 
      alert("not inited"); 
      return; 
     } 

     var oldPageAnchor = document.getElementById('pg' + this.currentPage); 
     oldPageAnchor.className = 'pg-normal'; 

     this.currentPage = pageNumber; 
     var newPageAnchor = document.getElementById('pg' + this.currentPage); 
     newPageAnchor.className = 'pg-selected'; 

     var from = (pageNumber - 1) * itemsPerPage + 1; 
     var to = from + itemsPerPage - 1; 
     this.showRecords(from, to); 
    } 

    this.prev = function() { 
     if (this.currentPage > 1) this.showPage(this.currentPage - 1); 
    } 

    this.next = function() { 
     if (this.currentPage < this.pages) { 
      this.showPage(this.currentPage + 1); 
     } 
    } 

    this.init = function() { 
     var rows = total_records; 
     var records = (rows.length - 1); 
     this.pages = Math.ceil(records/itemsPerPage); 
     this.inited = true; 
    } 

    this.showPageNav = function (pagerName, positionId) { 
     if (!this.inited) { 
      alert("not inited"); 
      return; 
     } 
     var element = document.getElementById(positionId); 
     var pagerHtml = '<span onclick="' + pagerName + '.prev();" class="pg-normal"> &#171 Prev </span> | '; 
     for (var page = 1; page <= this.pages; page++) 
      pagerHtml += '<span id="pg' + page + '" class="pg-normal" onclick="' + pagerName + '.showPage(' + page + ');">' + page + '</span> | '; 
     pagerHtml += '<span onclick="' + pagerName + '.next();" class="pg-normal"> Next &#187;</span>'; 
     element.innerHTML = pagerHtml; 
    } 
} 

這是我jsFiddle

請讓我知道如何解決在瀏覽器控制檯中出現的問題?

Uncaught TypeError: Cannot set property 'className' of null

+0

爲什麼這個標記爲'jquery'? – Alex

回答

4

這裏是您的解決方案,希望這有助於.. :)

// For each item in our JSON, add a table row and cells to the content string 
 

 
var total_records = 19; 
 

 
var data = [{ 
 
    id: 1, 
 
    name: 'cell1', 
 
    information: 'First Row' 
 
    }, { 
 
    id: 2, 
 
    name: 'cell2', 
 
    information: 'Second Row' 
 
    }, { 
 
    id: 1, 
 
    name: 'cell1', 
 
    information: 'First Row' 
 
    }, { 
 
    id: 2, 
 
    name: 'cell2', 
 
    information: 'Second Row' 
 
    }, { 
 
    id: 1, 
 
    name: 'cell1', 
 
    information: 'First Row' 
 
    }, { 
 
    id: 2, 
 
    name: 'cell2', 
 
    information: 'Second Row' 
 
    }, { 
 
    id: 1, 
 
    name: 'cell1', 
 
    information: 'First Row' 
 
    }, { 
 
    id: 2, 
 
    name: 'cell2', 
 
    information: 'Second Row' 
 
    }, { 
 
    id: 2, 
 
    name: 'cell2', 
 
    information: 'Second Row' 
 
    }, { 
 
    id: 1, 
 
    name: 'cell1', 
 
    information: 'First Row' 
 
    }, { 
 
    id: 2, 
 
    name: 'cell2', 
 
    information: 'Second Row' 
 
    }, { 
 
    id: 2, 
 
    name: 'cell2', 
 
    information: 'Second Row' 
 
    }, { 
 
    id: 1, 
 
    name: 'cell1', 
 
    information: 'First Row' 
 
    }, { 
 
    id: 2, 
 
    name: 'cell2', 
 
    information: 'Second Row' 
 
    }, { 
 
    id: 1, 
 
    name: 'cell1', 
 
    information: 'First Row' 
 
    }, { 
 
    id: 2, 
 
    name: 'cell2', 
 
    information: 'Second Row' 
 
    }, { 
 
    id: 1, 
 
    name: 'cell1', 
 
    information: 'First Row' 
 
    }, { 
 
    id: 2, 
 
    name: 'cell2', 
 
    information: 'Second Row' 
 
    }, { 
 
    id: 2, 
 
    name: 'cell2', 
 
    information: 'Second Row' 
 
    } 
 

 

 

 
]; 
 
var tableContent = ""; 
 
$.each(data, function() { 
 
    tableContent += '<tr>'; 
 
    tableContent += '<td><a href="#" class="linkshowuser" rel="' + this.name + '" title="Show Details">' + this.information + '</a></td>'; 
 
    tableContent += '<td><button onclick="viewLocationOnMap()">View on map</button></td>'; 
 
    tableContent += '<td>In Progress</button></td>'; 
 
    tableContent += '<td><a href="#" class="linkdeleteitem" rel="' + this._id + '">Delete</a></td>'; 
 
    tableContent += '</tr>'; 
 
}); 
 

 
// Inject the whole content string into our existing HTML table 
 
$('#results').append(tableContent); 
 

 
// Instantiate pagination after data is available 
 
pager = new Pager('results', 3); 
 
pager.init(); 
 
pager.showPageNav('pager', 'pageNavPosition'); 
 
pager.showPage(1); 
 

 
// pagination object codes. 
 
function Pager(tableName, itemsPerPage) { 
 
    this.tableName = tableName; 
 
    this.itemsPerPage = itemsPerPage; 
 
    this.currentPage = 1; 
 
    this.pages = 0; 
 
    this.inited = false; 
 

 

 

 
    this.showRecords = function(from, to) { 
 
    var rows = document.getElementById('results').rows; 
 
    // i starts from 1 to skip table header row 
 
    for (var i = 1; i < rows.length; i++) { 
 
     if (i < from || i > to) { 
 
     rows[i].style.display = 'none'; 
 
     } else { 
 
     rows[i].style.display = ''; 
 
     } 
 
    } 
 
    } 
 

 
    this.showPage = function(pageNumber) { 
 
    if (!this.inited) { 
 
     alert("not inited"); 
 
     return; 
 
    } 
 

 

 
    var oldPageAnchor = document.getElementById('pg' + this.currentPage); 
 
    oldPageAnchor.className = 'pg-normal'; 
 

 
    this.currentPage = pageNumber; 
 
    var newPageAnchor = document.getElementById('pg' + this.currentPage); 
 
    newPageAnchor.className = 'pg-selected'; 
 

 

 
    var from = (pageNumber - 1) * itemsPerPage + 1; 
 
    var to = from + itemsPerPage - 1; 
 
    this.showRecords(from, to); 
 

 

 

 

 
    } 
 

 
    this.prev = function() { 
 
    if (this.currentPage > 1) this.showPage(this.currentPage - 1); 
 
    } 
 

 
    this.next = function() { 
 
    if (this.currentPage < this.pages) { 
 
     this.showPage(this.currentPage + 1); 
 
    } 
 
    } 
 

 
    this.init = function() { 
 

 
    var rows = total_records; 
 
    var records = (rows - 1); 
 
    this.pages = Math.ceil(records/itemsPerPage); 
 
    this.inited = true; 
 
    } 
 

 
    this.showPageNav = function(pagerName, positionId) { 
 

 

 
    if (!this.inited) { 
 
     alert("not inited"); 
 
     return; 
 
    } 
 
    var element = document.getElementById(positionId); 
 
    var pagerHtml = '<span onclick="' + pagerName + '.prev();" class="pg-normal"> &#171 Prev </span> '; 
 
    for (var page = 1; page <= this.pages; page++) 
 
     pagerHtml += '<span id="pg' + page + '" class="pg-normal" onclick="' + pagerName + '.showPage(' + page + ');">' + page + '</span> '; 
 
    pagerHtml += '<span onclick="' + pagerName + '.next();" class="pg-normal"> Next &#187;</span>'; 
 
    element.innerHTML = pagerHtml; 
 
    } 
 
}
table { 
 
    border: 1px solid lightgray; 
 
} 
 
th { 
 
    border: 1px solid #2196F3; 
 
    padding: 5px; 
 
    background: #03A9F4; 
 
    color: #fff; 
 
} 
 
th, 
 
td { 
 
    border: 1px solid lightgray; 
 
    padding: 5px; 
 
} 
 
.pg-normal { 
 
    color: black; 
 
    font-weight: normal; 
 
    text-decoration: none; 
 
    cursor: pointer; 
 
} 
 
.pg-selected { 
 
    color: black; 
 
    font-weight: bold; 
 
    text-decoration: underline; 
 
    cursor: pointer; 
 
} 
 
div#pageNavPosition { 
 
    display: inline-block; 
 
    user-select: none; 
 
    -moz-user-select: none; 
 
    -webkit-user-select: none; 
 
    margin-top: 10px; 
 
} 
 
div#pageNavPosition span { 
 
    padding: 5px 9px; 
 
    background: #E0E0E0; 
 
    margin: 1px; 
 
    display: inline-block; 
 
    color: #eee; 
 
    border-radius: 5px; 
 
    text-transform: capitalize; 
 
} 
 
div#pageNavPosition span.pg-normal { 
 
    color: #404040; 
 
    font-weight: normal; 
 
    text-decoration: none; 
 
    cursor: pointer; 
 
} 
 
div#pageNavPosition span.pg-normal:hover { 
 
    color: white; 
 
    background: #9E9E9E; 
 
    text-decoration: underline; 
 
    cursor: pointer; 
 
} 
 
div#pageNavPosition span.pg-selected { 
 
    color: white; 
 
    font-weight: normal; 
 
    cursor: pointer; 
 
    background: #1C78C1; 
 
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js" <!-- Latest compiled and minified CSS --> 
 
    < link rel = "stylesheet" 
 
    href = "https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" 
 
    integrity = "sha384-1q8mTJOASx8j1Au+a5WDVnPi2lkFfwwEAa8hDDdjZlpLegxhjVME1fgjWPGmkzs7" 
 
    crossorigin = "anonymous" > 
 

 
    <!-- Optional theme --> 
 
    < link rel = "stylesheet" 
 
    href = "https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap-theme.min.css" 
 
    integrity = "sha384-fLW2N01lMqjakBkx3l/M9EahuwpSfeNvV63J5ezn3uZzapT0u7EYsXMjQV+0En5r" 
 
    crossorigin = "anonymous" > 
 

 
    <!-- Latest compiled and minified JavaScript --> 
 
    < script src = "https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js" 
 
    integrity = "sha384-0mSbJDEHialfmuBBQP6A4Qrprq5OVfW37PRR3j5ELqxss1yVqOtnepnHVP9aJ7xS" 
 
    crossorigin = "anonymous" > 
 
</script> 
 

 

 

 
<table id="results"> 
 
    <tr> 
 
    <th>ID</th> 
 
    <th>Information</th> 
 
    <th>Status</th> 
 
    <th>Actions</th> 
 
    </tr> 
 
</table> 
 
<div id="pageNavPosition"></div>

Fiddle Link https://jsfiddle.net/97238eyz/1/

3

看來document.getElementById('pg' + this.currentPage);沒有返回任何東西。

而下面的一段代碼似乎並不正確:

var oldPageAnchor = document.getElementById('pg' + this.currentPage); 
oldPageAnchor.className = 'pg-normal'; 

this.currentPage = pageNumber; 
var newPageAnchor = document.getElementById('pg' + this.currentPage); 
newPageAnchor.className = 'pg-selected'; 

因爲在第二getelementById您檢索同一項目的前

+0

雅我發現它給予undefned,請你讓我知道如何resoleve這個問題.. – Pawan

+0

我不能,如果我沒有看到HTML –

+0

非常感謝迴應,從這個小提琴我已採取了分頁代碼http://jsfiddle.net/48dxxm6o/6/ – Pawan

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