Function _fnColumnsSumWidth

external/.datatables.js:2370–2403

* Get the width for a given set of columns * * @param {*} settings DataTables settings object * @param {*} targets Columns - comma separated string or array of numbers * @param {*} original Use the original width (true) or calculated (false) * @param {*} incVisible Include visible columns

(settings, targets, original, incVisible)

	 * @returns Combined CSS value
	 */
	function _fnColumnsSumWidth(settings, targets, original, incVisible) {
		if (!Array.isArray(targets)) {
			targets = _fnColumnsFromHeader(targets)
		}

		var sum = 0
		var unit
		var columns = settings.aoColumns

		for (var i = 0, ien = targets.length; i < ien; i++) {
			var column = columns[targets[i]]
			var definedWidth = original ? column.sWidthOrig : column.sWidth

			if (!incVisible && column.bVisible === false) {
				continue
			}

			if (definedWidth === null || definedWidth === undefined) {
				return null // can't determine a defined width - browser defined
			} else if (typeof definedWidth === "number") {
				unit = "px"
				sum += definedWidth
			} else {
				var matched = definedWidth.match(/([\d\.]+)([^\d]*)/)

				if (matched) {
					sum += matched[1] * 1
					unit = matched.length === 3 ? matched[2] : "px"
				}
			}
		}

		return sum + unit
	}

	function _fnColumnsFromHeader(cell) {
		var attr = $(cell).closest("[data-dt-column]").attr("data-dt-column")