Dragging on html table cells

Question

Fiddle

$(document).live('mouseup', function () {
    flag = false;
});

var colIndex;
var lastRow;

$(document).on('mousedown', '.csstablelisttd', function (e) {
    //This line gets the index of the first clicked row.
    lastRow = $(this).closest("tr")[0].rowIndex;

    var rowIndex = $(this).closest("tr").index();
    colIndex = $(e.target).closest('td').index();
    $(".csstdhighlight").removeClass("csstdhighlight");
    if (colIndex == 0 || colIndex == 1) //)0 FOR FULL TIME CELL AND 1 FOR TIME SLOT CELL. 
    return;
    if ($('#contentPlaceHolderMain_tableAppointment tr').eq(rowIndex).find('td').eq(colIndex).hasClass('csstdred') == false) {
        $('#contentPlaceHolderMain_tableAppointment tr').eq(rowIndex).find('td').eq(colIndex).addClass('csstdhighlight');

        flag = true;
        return false;
    }
});

i am Dragging on table cells. While dragging(move downward direction) i have to move table scroll also. and also i want to select cells reverse (upward direction). what should i do.

I have make an selection on tr class.

Answer 1

Updated jsFiddle: http://jsfiddle.net/qvxBb/2/

Disable normal selection like this:

.myselect {
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    -khtml-user-select: none;
    -moz-user-select: moz-none;
    -ms-user-select: none;
    user-select: none;
}

And handle the row-selection with javascript like this:

// wether or not we are selecting
var selecting = false;
// the element we want to make selectable
var selectable = '.myselect tr:not(:nth-child(1)) td:nth-child(3)';

$(selectable).mousedown(function () {
    selecting = true;
}).mouseenter(function () {
    if (selecting) {
        $(this).addClass('csstdhighlight');
        fillGaps();
    }
});
$(window).mouseup(function () {
    selecting = false;
}).click(function () {
    $(selectable).removeClass('csstdhighlight');
});

// If you select too fast, js doesn't fire mousenter on all cells. 
// So we fill the missing ones by hand
function fillGaps() {
    min = $('td.csstdhighlight:first').parent().index();
    max = $('td.csstdhighlight:last').parent().index();
    $('.myselect tr:lt('+max+'):gt('+min+') td:nth-child(3)').addClass('csstdhighlight');
}

I just added a class in the HTML. All the HTML and CSS in unchanged besides what I've shown here.

Updated jsFiddle: http://jsfiddle.net/qvxBb/2/

Answer 2

There are several problems with your table, but I will correct the one you asked for.
To make your table scroll when your mouse get outside the container, add this code inside your mousedown event handler :

$('body').on('mousemove', function(e){
    div = $('#divScroll');      
    if(e.pageY > div.height() && (e.pageY - div.height()) > div.scrollTop()) {
        div.scrollTop(e.pageY - div.height());
    }
});

and this, inside your mouseup event handler :

$('body').off('mousemove');

See the updated Fiddle

But now, another issue appear. This is because of the rest of your code. The lines are not selected because the mouse leave the column.

Answer 3

Try removing the return false; inside

$('#contentPlaceHolderMain_tableAppointment tr').eq(rowIndex).find('td').eq(colIndex).addClass('csstdhighlight');
    flag = true;
    return false; //Remove this line
} 

Because return false; stops browser default behavior (scrolling automatically).

DEMO