Function _fnBuildHead

external/.datatables.js:2967–3018

* Create the HTML header for the table * @param {object} oSettings dataTables settings object * @memberof DataTable#oApi

(settings, side)

	 *  @memberof DataTable#oApi
	 */
	function _fnBuildHead(settings, side) {
		var classes = settings.oClasses
		var columns = settings.aoColumns
		var i, ien, row
		var target = side === "header" ? settings.nTHead : settings.nTFoot
		var titleProp = side === "header" ? "sTitle" : side

		// Footer might be defined
		if (!target) {
			return
		}

		// If no cells yet and we have content for them, then create
		if (side === "header" || _pluck(settings.aoColumns, titleProp).join("")) {
			row = $("tr", target)

			// Add a row if needed
			if (!row.length) {
				row = $("<tr/>").appendTo(target)
			}

			// Add the number of cells needed to make up to the number of columns
			if (row.length === 1) {
				var cells = $("td, th", row)

				for (i = cells.length, ien = columns.length; i < ien; i++) {
					$("<th/>")
						.html(columns[i][titleProp] || "")
						.appendTo(row)
				}
			}
		}

		var detected = _fnDetectHeader(settings, target, true)

		if (side === "header") {
			settings.aoHeader = detected
		} else {
			settings.aoFooter = detected
		}

		// ARIA role for the rows
		$(target).children("tr").attr("role", "row")

		// Every cell needs to be passed through the renderer
		$(target)
			.children("tr")
			.children("th, td")
			.each(function () {
				_fnRenderer(settings, side)(settings, $(this), classes)
			})
	}

	/**
	 * Build a layout structure for a header or footer