从外部div滚动div

Question

Check out the small html structure sample below for context. Check out this fiddle for and example of the problem.

Short explanation for fiddle users:

1. Scroll left - vertical scroll bar not visible
2. Scroll right - vertical visible
3. I want the vertical scroll bar always visible
4. Requirement - The header must remain fixed (visible while scrolling)

Long explanation:

I have a table with a fixed header and a scrollable body. The complexities of that requires two tables. That's all good. In my cause I also have resizable columns. table-layout: fixed for that to work. This is were problems arise.

To make the scrolling body work I've got a div that wraps the .rows table for scrolling. This works great until the grid, specifically the .rows table, overflows in the x direction. In this case the the vertical scroll bar is only visible if the grid is scrolled all the way to the right. Because the scroll bar is on the .row-wrapper div. And that overflow is being hidden by the .grid div. I'd like the scrollbar to be on the .grid-canvas div so that it is visible even when scrolled to the left side.

<div class=grid>
    <div class=grid-canvas>
        <table class=header></table>
        <div class=row-wrapper>
            <table class=rows></table>
        </div>
    </div>
</div>

side note: If you set the table display to block then the wrapping div isn't needed unless you want to support IE8 which I do. Maybe there's a way around that but that another question for another time.

Answer 1

Well after hours of hacking with no luck I decided to disect some of the existing libraries to see how they were accomplishing this. Unfortunately I was sorely disappointed. All of them were using javascript.

The up side to this is that the it only requires a small bit of code not that that means it will perform well. To make this perform as well as possible I'm updating the header when required in the x direction. Since this will typically be a small area in my case it should be good enough.

Hundredth times a charm!

fiddle

Here's the basic:

HTML

<div class=grid>
    <div class=grid-canvas>
        <div class=header-wrapper>
            <table class=header></table>
        </div>
        <div class=row-wrapper>
          <table class=rows></table>
        </div>
    </div>
</div>

Javascript

$headerDiv = $('.header-wrapper');
$rowDiv = $('.row-wrapper');
$rowDiv.scroll(function(e) {
    $headerDiv.css({
        left: -$rowDiv[0].scrollLeft + 'px'
    });
});​

CSS

.grid {
  height: 500px;
  width: 350px;
}

.grid-canvas {
  position: relative;
  width: 100%;
  height: 100%;
  overflow: hidden;
}

.header-wrapper {
  position: absolute;
  top: 0;
  width: auto;
  background-color: white;
  z-index: 1;
}

.row-wrapper {
  position: absolute;
  top: 0;
  height: 100%;
  width: 100%;
  box-sizing: border-box;
  -moz-box-sizing: border-box;
  overflow: auto;
  padding-top: 18px;
  background-color: lightgreen;
}

th, td {
  width: 80px;
  min-width: 80px;
  max-width: 80px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

​

Answer 2

What about this one, If you want to use javascript/jQuery ?

$(function(){
    $("table").stickyTableHeaders();
});

/*! Copyright (c) 2011 by Jonas Mosbech - https://github.com/jmosbech/StickyTableHeaders
    MIT license info: https://github.com/jmosbech/StickyTableHeaders/blob/master/license.txt */

;(function ($, window, undefined) {
    'use strict';

    var pluginName = 'stickyTableHeaders';
    var defaults = {
            fixedOffset: 0
        };

    function Plugin (el, options) {
        // To avoid scope issues, use 'base' instead of 'this'
        // to reference this class from internal events and functions.
        var base = this;

        // Access to jQuery and DOM versions of element
        base.$el = $(el);
        base.el = el;

        // Cache DOM refs for performance reasons
        base.$window = $(window);
        base.$clonedHeader = null;
        base.$originalHeader = null;

        // Keep track of state
        base.isCloneVisible = false;
        base.leftOffset = null;
        base.topOffset = null;

        base.init = function () {
            base.options = $.extend({}, defaults, options);

            base.$el.each(function () {
                var $this = $(this);

                // remove padding on <table> to fix issue #7
                $this.css('padding', 0);

                $this.wrap('<div class="divTableWithFloatingHeader"></div>');

                base.$originalHeader = $('thead:first', this);
                base.$clonedHeader = base.$originalHeader.clone();

                base.$clonedHeader.addClass('tableFloatingHeader');
                base.$clonedHeader.css({
                    'position': 'fixed',
                    'top': 0,
                    'z-index': 1, // #18: opacity bug
                    'display': 'none'
                });

                base.$originalHeader.addClass('tableFloatingHeaderOriginal');

                base.$originalHeader.after(base.$clonedHeader);

                // enabling support for jquery.tablesorter plugin
                // forward clicks on clone to original
                $('th', base.$clonedHeader).click(function (e) {
                    var index = $('th', base.$clonedHeader).index(this);
                    $('th', base.$originalHeader).eq(index).click();
                });
                $this.bind('sortEnd', base.updateWidth);
            });

            base.updateWidth();
            base.toggleHeaders();

            base.$window.scroll(base.toggleHeaders);
            base.$window.resize(base.toggleHeaders);
            base.$window.resize(base.updateWidth);
        };

        base.toggleHeaders = function () {
            base.$el.each(function () {
                var $this = $(this);

                var newTopOffset = isNaN(base.options.fixedOffset) ?
                    base.options.fixedOffset.height() : base.options.fixedOffset;

                var offset = $this.offset();
                var scrollTop = base.$window.scrollTop() + newTopOffset;
                var scrollLeft = base.$window.scrollLeft();

                if ((scrollTop > offset.top) && (scrollTop < offset.top + $this.height())) {
                    var newLeft = offset.left - scrollLeft;
                    if (base.isCloneVisible && (newLeft === base.leftOffset) && (newTopOffset === base.topOffset)) {
                        return;
                    }

                    base.$clonedHeader.css({
                        'top': newTopOffset,
                        'margin-top': 0,
                        'left': newLeft,
                        'display': 'block'
                    });
                    base.$originalHeader.css('visibility', 'hidden');
                    base.isCloneVisible = true;
                    base.leftOffset = newLeft;
                    base.topOffset = newTopOffset;
                }
                else if (base.isCloneVisible) {
                    base.$clonedHeader.css('display', 'none');
                    base.$originalHeader.css('visibility', 'visible');
                    base.isCloneVisible = false;
                }
            });
        };

        base.updateWidth = function () {
            // Copy cell widths and classes from original header
            $('th', base.$clonedHeader).each(function (index) {
                var $this = $(this);
                var $origCell = $('th', base.$originalHeader).eq(index);
                this.className = $origCell.attr('class') || '';
                $this.css('width', $origCell.width());
            });

            // Copy row width from whole table
            base.$clonedHeader.css('width', base.$originalHeader.width());
        };

        // Run initializer
        base.init();
    }

    // A really lightweight plugin wrapper around the constructor,
    // preventing against multiple instantiations
    $.fn[pluginName] = function ( options ) {
        return this.each(function () {
            if (!$.data(this, 'plugin_' + pluginName)) {
                $.data(this, 'plugin_' + pluginName, new Plugin( this, options ));
            }
        });
    };

})(jQuery, window);

live demo

Sorry, i forgot from where i got it. but special thanks to him/her. And also the author ie Jonas Mosbech. Hope, it will helps you. Thanks. !!

Answer 3

i edited your css and guess this is what you want:

table {
  table-layout: fixed;
}

th, td {
  width: 80px;
  min-width: 80px;
  max-width: 80px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.grid {
  height: 500px;
  width: 350px;

  overflow-x: auto;
  overflow-y: scroll;
}

.grid-canvas {
  position: relative;
  width: 100%;
  height: 100%;
}

.header {
  position: absolute;
  top: 0;
  background-color: white;
  z-index: 10;
}

.row-wrapper {
  position: absolute;
  top: 0;
  width: auto;
  height: auto;
  /* assumed height of the header */
  padding-top: 18px;
  box-sizing: border-box;
  -moz-box-sizing: border-box;
  background-color: lightgreen;
}