Code Slave: pagination with js

<html version="-//W3C//DTD HTML 4.01 Transitional//EN">
<head>
        <style type="text/css">
            .pg-normal { color: black; font-weight: normal; text-decoration: none; cursor: pointer; }
            .pg-selected {color: black; font-weight: bold; text-decoration: underline;cursor: pointer;}
        </style>
<script type="text/javascript" >
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 < 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 = 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 = '<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 »</span>';

        element.innerHTML = pagerHtml;
    }
}

</script>
</head>
<body>
        <form action="" method="get" enctype="application/x-www-form-urlencoded">
        <table id="results">
        <tr> <th>#</th> <th>field</th></tr>
            <tr><td>1</td><td><input type="text" name="field-name" value="rec1"></td></tr>
            <tr><td>2</td><td><input type="text" name="field-name" value="rec2"></td></tr>
            <tr><td>3</td><td><input type="text" name="field-name" value="rec3"></td></tr>
            <tr><td>4</td><td><input type="text" name="field-name" value="rec4"></td></tr>
            <tr><td>5</td><td><input type="text" name="field-name" value="rec5"></td></tr>
            <tr><td>6</td><td><input type="text" name="field-name" value="rec6"></td></tr>
            <tr><td>7</td><td><input type="text" name="field-name" value="rec7"></td></tr>
            <tr> <td>8</td><td><input type="text" name="field-name" value="rec8"></td></tr>
            <tr><td>9</td><td><input type="text" name="field-name" value="rec9"></td></tr>
            <tr><td>10</td><td><input type="text" name="field-name" value="rec10"></td></tr>
        </table>
        <div id="pageNavPosition"></div>
        <div><input type="submit" onclick="alert('Hey, this is just a sample!\n Welcome from cyberoot.blogspot.com'); return false;" /> <input type="reset" /></div>
    </form>
    <script type="text/javascript"></script>

    </body>
</html>

Code Slave

Tuesday, July 17, 2012

pagination with js

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