_validate.js

// --------- validate.js -----------
var validate = {

	// called whenever a new pie chart is created
	initialCheck: function(pie) {
		var cssPrefix = pie.cssPrefix;
		var element = pie.element;
		var options = pie.options;

		// confirm d3 is available [check minimum version]
		if (!window.d3 || !window.d3.hasOwnProperty("version")) {
			console.error("d3pie error: d3 is not available");
			return false;
		}

		// confirm element is either a DOM element or a valid string for a DOM element
		if (!(element instanceof HTMLElement || element instanceof SVGElement)) {
			console.error("d3pie error: the first d3pie() param must be a valid DOM element (not jQuery) or a ID string.");
			return false;
		}

		// confirm the CSS prefix is valid. It has to start with a-Z and contain nothing but a-Z0-9_-
		if (!(/[a-zA-Z][a-zA-Z0-9_-]*$/.test(cssPrefix))) {
			console.error("d3pie error: invalid options.misc.cssPrefix");
			return false;
		}

		// confirm some data has been supplied
		if (!helpers.isArray(options.data.content)) {
			console.error("d3pie error: invalid config structure: missing data.content property.");
			return false;
		}
		if (options.data.content.length === 0) {
			console.error("d3pie error: no data supplied.");
			return false;
		}

		// clear out any invalid data. Each data row needs a valid positive number and a label
		var data = [];
		for (var i=0; i<options.data.content.length; i++) {
			if (typeof options.data.content[i].value !== "number" || isNaN(options.data.content[i].value)) {
				console.log("not valid: ", options.data.content[i]);
				continue;
			}
			if (options.data.content[i].value <= 0) {
				console.log("not valid - should have positive value: ", options.data.content[i]);
				continue;
			}
			data.push(options.data.content[i]);
		}
		pie.options.data.content = data;

		// labels.outer.hideWhenLessThanPercentage - 1-100
		// labels.inner.hideWhenLessThanPercentage - 1-100

		return true;
	}
};