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This topic contains 1 reply, has 2 voices, and was last updated by  Dimitar 12 years, 5 months ago.

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  • Author
    Scroll control Posts
  • October 28, 2012 at 7:28 am Scroll control #10124

    jmaynard
    Participant

    I would like to force a scroll so that a particular row is at the top of the display – ensurerowvisible only puts the selected row into the viewable area.
    How can I ensure any given row is scrolled to the top of the grid display?
    thanks

    October 29, 2012 at 6:21 am Scroll control #10131

    Dimitar
    Participant

    Hello jmaynard,

    Here is a way of putting a particular row on top by using the scrolloffset method:

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <title id='Description'>This example shows how to populate the Grid with large data
            set.</title>
        <link rel="stylesheet" href="../../jqwidgets/styles/jqx.base.css" type="text/css" />
        <script type="text/javascript" src="../../scripts/jquery-1.8.2.min.js"></script>
        <script type="text/javascript" src="../../jqwidgets/jqxcore.js"></script>
        <script type="text/javascript" src="../../jqwidgets/jqxdata.js"></script>
        <script type="text/javascript" src="../../jqwidgets/jqxbuttons.js"></script>
        <script type="text/javascript" src="../../jqwidgets/jqxscrollbar.js"></script>
        <script type="text/javascript" src="../../jqwidgets/jqxmenu.js"></script>
        <script type="text/javascript" src="../../jqwidgets/jqxgrid.js"></script>
        <script type="text/javascript" src="../../jqwidgets/jqxgrid.selection.js"></script>
        <script type="text/javascript" src="../../scripts/gettheme.js"></script>
        <script type="text/javascript">
            $(document).ready(function () {
                var theme = getTheme();
                // prepare the data
                var data = new Array();
                var firstNames =
                [
                    "Andrew", "Nancy", "Shelley", "Regina", "Yoshi", "Antoni", "Mayumi", "Ian", "Peter", "Lars", "Petra", "Martin", "Sven", "Elio", "Beate", "Cheryl", "Michael", "Guylene"
                ];
                var lastNames =
                [
                    "Fuller", "Davolio", "Burke", "Murphy", "Nagase", "Saavedra", "Ohno", "Devling", "Wilson", "Peterson", "Winkler", "Bein", "Petersen", "Rossi", "Vileid", "Saylor", "Bjorn", "Nodier"
                ];
                var productNames =
                [
                    "Black Tea", "Green Tea", "Caffe Espresso", "Doubleshot Espresso", "Caffe Latte", "White Chocolate Mocha", "Cramel Latte", "Caffe Americano", "Cappuccino", "Espresso Truffle", "Espresso con Panna", "Peppermint Mocha Twist"
                ];
                var priceValues =
                [
                    "2.25", "1.5", "3.0", "3.3", "4.5", "3.6", "3.8", "2.5", "5.0", "1.75", "3.25", "4.0"
                ];
                for (var i = 0; i < 30000; i++) {
                    var row = {};
                    var productindex = Math.floor(Math.random() * productNames.length);
                    var price = parseFloat(priceValues[productindex]);
                    var quantity = 1 + Math.round(Math.random() * 10);
                    row["id"] = i;
                    row["firstname"] = firstNames[Math.floor(Math.random() * firstNames.length)];
                    row["lastname"] = lastNames[Math.floor(Math.random() * lastNames.length)];
                    row["productname"] = productNames[productindex];
                    row["price"] = price;
                    row["quantity"] = quantity;
                    row["total"] = price * quantity;
                    data[i] = row;
                }
                var source =
                {
                    localdata: data,
                    datatype: "array"
                };
                $("#jqxgrid").jqxGrid(
                {
                    width: 670,
                    source: source,
                    theme: theme,
                    columns: [
                      { text: 'Id', datafield: 'id', width: 50 },
                      { text: 'First Name', datafield: 'firstname', width: 100 },
                      { text: 'Last Name', datafield: 'lastname', width: 100 },
                      { text: 'Product', datafield: 'productname', width: 180 },
                      { text: 'Quantity', datafield: 'quantity', width: 80, cellsalign: 'right' },
                      { text: 'Unit Price', datafield: 'price', width: 80, cellsalign: 'right', cellsformat: 'c2' },
                      { text: 'Total', datafield: 'total', cellsalign: 'right', cellsformat: 'c2' }
                    ]
                });
                $("#scroll").click(function () {
                    var Height = $('#jqxgrid').jqxGrid('rowsheight');
                    $("#jqxgrid").jqxGrid('scrolloffset', Height * 50, 0);
                });
            });
        </script>
    </head>
    <body class='default'>
        <div id='jqxWidget' style="font-size: 13px; font-family: Verdana; float: left;">
            <div id="jqxgrid">
            </div>
        </div>
        <button id="scroll">
            Scroll to row 50</button>
    </body>
    </html>

    Best Regards,
    Dimitar

    jQWidgets team
    http://www.jqwidgets.com/

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