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POHow to integrate "items per page" and "pagination"
 

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  1. POHow to integrate "items per page" and "pagination"
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    <p>I've written the following codes. The idea is to pass the selected value of "Reports per page" into javascript pagination functions to display the pages accordingly.</p> <p>Problem: value seemingly passed correctly but pages not displaying properly. E.g. value for "reports per page" = 2. But instead of displaying 2 reports per page, all/total reports were displayed and 2 reports were deducted when "NEXT" is clicked each time / moving from page 1 to 2, etc.</p> <p>Can anyone advise what is wrong with my codes? Thanks!</p> <pre><code> &lt;table&gt; &lt;tr&gt; &lt;td&gt;&lt;label id="lDisplayPerPg" for="lDisplayPerPg"&gt;Reports per page&lt;/label&gt; &lt;select name="listDisplayPerPg" id="listDisplayPerPg"&gt; &lt;option value="2" selected="selected"&gt;2&lt;/option&gt; &lt;option value="4"&gt;4&lt;/option&gt; &lt;option value="6"&gt;6&lt;/option&gt; &lt;option value="8"&gt;8&lt;/option&gt; &lt;/select&gt;&lt;/td&gt; &lt;/tr&gt; &lt;/table&gt; &lt;form method="post" action=""&gt; &lt;table id="tadminViewReport" border="0" width="960px" cellpadding="0" cellspacing="0"&gt; &lt;tr&gt; &lt;th width="15%"&gt;Username&lt;/th&gt; &lt;th width="15%"&gt;Report ID&lt;/th&gt; &lt;th width="40%"&gt;Report Title&lt;/th&gt; &lt;th width="20%"&gt;Date submitted&lt;/th&gt; &lt;th width="10%"&gt;Status&lt;/th&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt;username1&lt;/td&gt; &lt;td&gt;reportID1&lt;/td&gt; &lt;td class="reportDoc"&gt;Document 1&lt;/td&gt; &lt;td&gt;Date 1&lt;/td&gt; &lt;td&gt;&lt;a href="admin_report_details.html"&gt;Received&lt;/a&gt;&lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt;username2&lt;/td&gt; &lt;td&gt;reportID2&lt;/td&gt; &lt;td class="reportDoc"&gt;Document 2&lt;/td&gt; &lt;td&gt;Date 2&lt;/td&gt; &lt;td&gt;&lt;a href="admin_report_details.html"&gt;In Queue&lt;/a&gt;&lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt;username3&lt;/td&gt; &lt;td&gt;reportID3&lt;/td&gt; &lt;td class="reportDoc"&gt;Document 3&lt;/td&gt; &lt;td&gt;Date 3&lt;/td&gt; &lt;td&gt;&lt;a href="admin_report_details.html"&gt;Completed&lt;/a&gt;&lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt;username4&lt;/td&gt; &lt;td&gt;reportID4&lt;/td&gt; &lt;td class="reportDoc"&gt;Document 4&lt;/td&gt; &lt;td&gt;Date 4&lt;/td&gt; &lt;td&gt;&lt;a href="admin_report_details.html"&gt;In Queue&lt;/a&gt;&lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt;username5&lt;/td&gt; &lt;td&gt;reportID5&lt;/td&gt; &lt;td class="reportDoc"&gt;Document 5&lt;/td&gt; &lt;td&gt;Date 5&lt;/td&gt; &lt;td&gt;&lt;a href="admin_report_details.html"&gt;In Queue&lt;/a&gt;&lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt;username6&lt;/td&gt; &lt;td&gt;reportID6&lt;/td&gt; &lt;td class="reportDoc"&gt;Document 6&lt;/td&gt; &lt;td&gt;Date 6&lt;/td&gt; &lt;td&gt;&lt;a href="admin_report_details.html"&gt;Completed&lt;/a&gt;&lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt;username7&lt;/td&gt; &lt;td&gt;reportID7&lt;/td&gt; &lt;td class="reportDoc"&gt;Document 7&lt;/td&gt; &lt;td&gt;Date 7&lt;/td&gt; &lt;td&gt;&lt;a href="admin_report_details.html"&gt;Completed&lt;/a&gt;&lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt;username8&lt;/td&gt; &lt;td&gt;reportID8&lt;/td&gt; &lt;td class="reportDoc"&gt;Document 8&lt;/td&gt; &lt;td&gt;Date 8&lt;/td&gt; &lt;td&gt;&lt;a href="admin_report_details.html"&gt;Received&lt;/a&gt;&lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt;username9&lt;/td&gt; &lt;td&gt;reportID9&lt;/td&gt; &lt;td class="reportDoc"&gt;Document 9&lt;/td&gt; &lt;td&gt;Date 9&lt;/td&gt; &lt;td&gt;&lt;a href="admin_report_details.html"&gt;Received&lt;/a&gt;&lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt;username10&lt;/td&gt; &lt;td&gt;reportID10&lt;/td&gt; &lt;td class="reportDoc"&gt;Document 10&lt;/td&gt; &lt;td&gt;Date 10&lt;/td&gt; &lt;td&gt;&lt;a href="admin_report_details.html"&gt;Received&lt;/a&gt;&lt;/td&gt; &lt;/tr&gt; &lt;/table&gt; &lt;div id="pageNavPosition"&gt;&lt;/div&gt; &lt;br /&gt; &lt;/form&gt; &lt;script type="text/javascript"&gt;&lt;!-- reportsPerPage = listDisplayPerPg.options[listDisplayPerPg.selectedIndex].value; var pager = new Pager('tadminViewReport', reportsPerPage); pager.init(); pager.showPageNav('pager', 'pageNavPosition'); pager.showPage(1); //--&gt;&lt;/script&gt; function Pager(tableName, itemsPerPage) { //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(tableName).rows; // i starts from 1 to skip table header row for (var i = 1; i &lt; rows.length; i++) { if (i &lt; from || i &gt; 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); var pgNext = document.getElementById(this.pagerName + 'pgNext'); var pgPrev = document.getElementById(this.pagerName + 'pgPrev'); if (pgNext != null) { if (this.currentPage == this.pages) pgNext.style.display = 'none'; else pgNext.style.display = ''; } if (pgPrev != null) { if (this.currentPage == 1) pgPrev.style.display = 'none'; else pgPrev.style.display = ''; } } this.prev = function() { if (this.currentPage &gt; 1) this.showPage(this.currentPage - 1); } this.next = function() { if (this.currentPage &lt; this.pages) { this.showPage(this.currentPage + 1); } } this.init = function() { var rows = document.getElementById(tableName).rows; 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 = '&lt;span id="' + pagerName + 'pgPrev" onclick="' + pagerName + '.prev();" class="pg-normal"&gt; &amp;#171 Prev &lt;/span&gt; &amp;nbsp; '; for (var page = 1; page &lt;= this.pages; page++) pagerHtml += '&lt;span id="pg' + page + '" class="pg-normal" onclick="' + pagerName + '.showPage(' + page + ');"&gt;' + page + '&lt;/span&gt; &amp;nbsp; '; pagerHtml += '&lt;span id="' + pagerName + 'pgNext" onclick="'+ pagerName+'.next();" class="pg-normal"&gt; Next &amp;#187;&lt;/span&gt;'; element.innerHTML = pagerHtml; } } </code></pre>
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