/**
* Convert a CSS unit width to pixels (e.g. 2em)
* @param {string} sWidth width to be converted
* @param {node} nParent parent to get the with for (required for relative widths) - optional
* @returns {int} iWidth width in pixels
* @memberof DataTable#oApi
*/
function _fnConvertToWidth ( sWidth, nParent )
{
if ( !sWidth || sWidth === null || sWidth === '' )
{
return 0;
}
if ( !nParent )
{
nParent = document.body;
}
var iWidth;
var nTmp = document.createElement( "div" );
nTmp.style.width = _fnStringToCss( sWidth );
nParent.appendChild( nTmp );
iWidth = nTmp.offsetWidth;
nParent.removeChild( nTmp );
return ( iWidth );
}
/**
* Calculate the width of columns for the table
* @param {object} oSettings dataTables settings object
* @memberof DataTable#oApi
*/
function _fnCalculateColumnWidths ( oSettings )
{
var iTableWidth = oSettings.nTable.offsetWidth;
var iUserInputs = 0;
var iTmpWidth;
var iVisibleColumns = 0;
var iColums = oSettings.aoColumns.length;
var i, iIndex, iCorrector, iWidth;
var oHeaders = $('th', oSettings.nTHead);
var widthAttr = oSettings.nTable.getAttribute('width');
var nWrapper = oSettings.nTable.parentNode;
/* Convert any user input sizes into pixel sizes */
for ( i=0 ; i<iColums ; i++ )
{
if ( oSettings.aoColumns[i].bVisible )
{
iVisibleColumns++;
if ( oSettings.aoColumns[i].sWidth !== null )
{
iTmpWidth = _fnConvertToWidth( oSettings.aoColumns[i].sWidthOrig,
nWrapper );
if ( iTmpWidth !== null )
{
oSettings.aoColumns[i].sWidth = _fnStringToCss( iTmpWidth );
}
iUserInputs++;
}
}
}
/* If the number of columns in the DOM equals the number that we have to process in
* DataTables, then we can use the offsets that are created by the web-browser. No custom
* sizes can be set in order for this to happen, nor scrolling used
*/
if ( iColums == oHeaders.length && iUserInputs === 0 && iVisibleColumns == iColums &&
oSettings.oScroll.sX === "" && oSettings.oScroll.sY === "" )
{
for ( i=0 ; i<oSettings.aoColumns.length ; i++ )
{
iTmpWidth = $(oHeaders[i]).width();
if ( iTmpWidth !== null )
{
oSettings.aoColumns[i].sWidth = _fnStringToCss( iTmpWidth );
}
}
}
else
{
/* Otherwise we are going to have to do some calculations to get the width of each column.
* Construct a 1 row table with the widest node in the data, and any user defined widths,
* then insert it into the DOM and allow the browser to do all the hard work of
* calculating table widths.
*/
var
nCalcTmp = oSettings.nTable.cloneNode( false ),
nTheadClone = oSettings.nTHead.cloneNode(true),
nBody = document.createElement( 'tbody' ),
nTr = document.createElement( 'tr' ),
nDivSizing;
nCalcTmp.removeAttribute( "id" );
nCalcTmp.appendChild( nTheadClone );
if ( oSettings.nTFoot !== null )
{
nCalcTmp.appendChild( oSettings.nTFoot.cloneNode(true) );
_fnApplyToChildren( function(n) {
n.style.width = "";
}, nCalcTmp.getElementsByTagName('tr') );
}
nCalcTmp.appendChild( nBody );
nBody.appendChild( nTr );
/* Remove any sizing that was previously applied by the styles */
var jqColSizing = $('thead th', nCalcTmp);
if ( jqColSizing.length === 0 )
{
jqColSizing = $('tbody tr:eq(0)>td', nCalcTmp);
}
/* Apply custom sizing to the cloned header */
var nThs = _fnGetUniqueThs( oSettings, nTheadClone );
iCorrector = 0;
for ( i=0 ; i<iColums ; i++ )
{
var oColumn = oSettings.aoColumns[i];
if ( oColumn.bVisible && oColumn.sWidthOrig !== null && oColumn.sWidthOrig !== "" )
{
nThs[i-iCorrector].style.width = _fnStringToCss( oColumn.sWidthOrig );
}
else if ( oColumn.bVisible )
{
nThs[i-iCorrector].style.width = "";
}
else
{
iCorrector++;
}
}
/* Find the biggest td for each column and put it into the table */
for ( i=0 ; i<iColums ; i++ )
{
if ( oSettings.aoColumns[i].bVisible )
{
var nTd = _fnGetWidestNode( oSettings, i );
if ( nTd !== null )
{
nTd = nTd.cloneNode(true);
if ( oSettings.aoColumns[i].sContentPadding !== "" )
{
nTd.innerHTML += oSettings.aoColumns[i].sContentPadding;
}
nTr.appendChild( nTd );
}
}
}
/* Build the table and 'display' it */
nWrapper.appendChild( nCalcTmp );
/* When scrolling (X or Y) we want to set the width of the table as appropriate. However,
* when not scrolling leave the table width as it is. This results in slightly different,
* but I think correct behaviour
*/
if ( oSettings.oScroll.sX !== "" && oSettings.oScroll.sXInner !== "" )
{
nCalcTmp.style.width = _fnStringToCss(oSettings.oScroll.sXInner);
}
else if ( oSettings.oScroll.sX !== "" )
{
nCalcTmp.style.width = "";
if ( $(nCalcTmp).width() < nWrapper.offsetWidth )
{
nCalcTmp.style.width = _fnStringToCss( nWrapper.offsetWidth );
}
}
else if ( oSettings.oScroll.sY !== "" )
{
nCalcTmp.style.width = _fnStringToCss( nWrapper.offsetWidth );
}
else if ( widthAttr )
{
nCalcTmp.style.width = _fnStringToCss( widthAttr );
}
nCalcTmp.style.visibility = "hidden";
/* Scrolling considerations */
_fnScrollingWidthAdjust( oSettings, nCalcTmp );
/* Read the width's calculated by the browser and store them for use by the caller. We
* first of all try to use the elements in the body, but it is possible that there are
* no elements there, under which circumstances we use the header elements
*/
var oNodes = $("tbody tr:eq(0)", nCalcTmp).children();
if ( oNodes.length === 0 )
{
oNodes = _fnGetUniqueThs( oSettings, $('thead', nCalcTmp)[0] );
}
/* Browsers need a bit of a hand when a width is assigned to any columns when
* x-scrolling as they tend to collapse the table to the min-width, even if
* we sent the column widths. So we need to keep track of what the table width
* should be by summing the user given values, and the automatic values
*/
if ( oSettings.oScroll.sX !== "" )
{
var iTotal = 0;
iCorrector = 0;
for ( i=0 ; i<oSettings.aoColumns.length ; i++ )
{
if ( oSettings.aoColumns[i].bVisible )
{
if ( oSettings.aoColumns[i].sWidthOrig === null )
{
iTotal += $(oNodes[iCorrector]).outerWidth();
}
else
{
iTotal += parseInt(oSettings.aoColumns[i].sWidth.replace('px',''), 10) +
($(oNodes[iCorrector]).outerWidth() - $(oNodes[iCorrector]).width());
}
iCorrector++;
}
}
nCalcTmp.style.width = _fnStringToCss( iTotal );
oSettings.nTable.style.width = _fnStringToCss( iTotal );
}
iCorrector = 0;
for ( i=0 ; i<oSettings.aoColumns.length ; i++ )
{
if ( oSettings.aoColumns[i].bVisible )
{
iWidth = $(oNodes[iCorrector]).width();
if ( iWidth !== null && iWidth > 0 )
{
oSettings.aoColumns[i].sWidth = _fnStringToCss( iWidth );
}
iCorrector++;
}
}
var cssWidth = $(nCalcTmp).css('width');
oSettings.nTable.style.width = (cssWidth.indexOf('%') !== -1) ?
cssWidth : _fnStringToCss( $(nCalcTmp).outerWidth() );
nCalcTmp.parentNode.removeChild( nCalcTmp );
}
if ( widthAttr )
{
oSettings.nTable.style.width = _fnStringToCss( widthAttr );
}
}
/**
* Adjust a table's width to take account of scrolling
* @param {object} oSettings dataTables settings object
* @param {node} n table node
* @memberof DataTable#oApi
*/
function _fnScrollingWidthAdjust ( oSettings, n )
{
if ( oSettings.oScroll.sX === "" && oSettings.oScroll.sY !== "" )
{
/* When y-scrolling only, we want to remove the width of the scroll bar so the table
* + scroll bar will fit into the area avaialble.
*/
var iOrigWidth = $(n).width();
n.style.width = _fnStringToCss( $(n).outerWidth()-oSettings.oScroll.iBarWidth );
}
else if ( oSettings.oScroll.sX !== "" )
{
/* When x-scrolling both ways, fix the table at it's current size, without adjusting */
n.style.width = _fnStringToCss( $(n).outerWidth() );
}
}
/**
* Get the widest node
* @param {object} oSettings dataTables settings object
* @param {int} iCol column of interest
* @returns {node} widest table node
* @memberof DataTable#oApi
*/
function _fnGetWidestNode( oSettings, iCol )
{
var iMaxIndex = _fnGetMaxLenString( oSettings, iCol );
if ( iMaxIndex < 0 )
{
return null;
}
if ( oSettings.aoData[iMaxIndex].nTr === null )
{
var n = document.createElement('td');
n.innerHTML = _fnGetCellData( oSettings, iMaxIndex, iCol, '' );
return n;
}
return _fnGetTdNodes(oSettings, iMaxIndex)[iCol];
}
/**
* Get the maximum strlen for each data column
* @param {object} oSettings dataTables settings object
* @param {int} iCol column of interest
* @returns {string} max string length for each column
* @memberof DataTable#oApi
*/
function _fnGetMaxLenString( oSettings, iCol )
{
var iMax = -1;
var iMaxIndex = -1;
for ( var i=0 ; i<oSettings.aoData.length ; i++ )
{
var s = _fnGetCellData( oSettings, i, iCol, 'display' )+"";
s = s.replace( /<.*?>/g, "" );
if ( s.length > iMax )
{
iMax = s.length;
iMaxIndex = i;
}
}
return iMaxIndex;
}
/**
* Append a CSS unit (only if required) to a string
* @param {array} aArray1 first array
* @param {array} aArray2 second array
* @returns {int} 0 if match, 1 if length is different, 2 if no match
* @memberof DataTable#oApi
*/
function _fnStringToCss( s )
{
if ( s === null )
{
return "0px";
}
if ( typeof s == 'number' )
{
if ( s < 0 )
{
return "0px";
}
return s+"px";
}
/* Check if the last character is not 0-9 */
var c = s.charCodeAt( s.length-1 );
if (c < 0x30 || c > 0x39)
{
return s;
}
return s+"px";
}
/**
* Get the width of a scroll bar in this browser being used
* @returns {int} width in pixels
* @memberof DataTable#oApi
*/
function _fnScrollBarWidth ()
{
var inner = document.createElement('p');
var style = inner.style;
style.width = "100%";
style.height = "200px";
style.padding = "0px";
var outer = document.createElement('div');
style = outer.style;
style.position = "absolute";
style.top = "0px";
style.left = "0px";
style.visibility = "hidden";
style.width = "200px";
style.height = "150px";
style.padding = "0px";
style.overflow = "hidden";
outer.appendChild(inner);
document.body.appendChild(outer);
var w1 = inner.offsetWidth;
outer.style.overflow = 'scroll';
var w2 = inner.offsetWidth;
if ( w1 == w2 )
{
w2 = outer.clientWidth;
}
document.body.removeChild(outer);
return (w1 - w2);
}
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