gistfile1.js

/* Toggle Resize an element (if necessary) to fit its container. */
$.fn.toggleSizeToFit = function() {

	var width = this.width();
	var containerWidth = this.parent().width();
	var dimensions;

	// If bigger than container
	if (width > containerWidth) {
		dimensions = { width: width, height: this.height() };

		// Shrink to fit
		var ratio = containerWidth / dimensions.width;
		this.width(containerWidth);
		this.height(dimensions.height * ratio);

		// Save original dimensions
		this.data("sizeToFitDimensions", dimensions);

	} else {
		dimensions = this.data("sizeToFitDimensions");

		// If already shrunk
		if (dimensions) {

			// Restore original dimensions
			this.width(dimensions.width);
			this.height(dimensions.height);

			// Clear saved copy
			this.removeData("sizeToFitDimensions");
		} else {

			// Otherwise, ensure the element is centred.
			this.width("100%");

		}

	}
};

window.addEventListener("SVGLoad", function() {

	/* Resize SVG images (if necessary) to fit their container. */
	$(".concept-map svg").each(function() {
		$(this).toggleSizeToFit();
	});

}, false);