Javascript for prefilling a formstack form for inputs, textareas, radio buttons, checkboxes, dropdowns... just missing date and time, cause those are multiple selects for one "field"

gistfile1.js

var submission_data = JSON.parse("<%=j(@submission_data[:data].to_json) %>")
var i, field_data, field;
for(i = 0; i < submission_data.length; i++){
	field_data = submission_data[i];

	// this takes care of inputs, cehckboxes, radios, and textareas
	field = $j("[name*=field" + field_data.field + "]" );

	if (field.length == 1 && field.length != 0){
		if (field[0].nodeName == "INPUT"){
			// regular input
			field.val(field_data.value);				
		} else if (field[0].nodeName == "TEXTAREA"){
			// text area
			field.html(field_data.value);
		} else {
			// select
			options = field.find("option");
			$j.each(options, function(index, element){
				var self = $j(element);
				if (field_data.value.indexOf(self.html()) > -1){
					self.attr("selected", true);
				}
			});
		}

	} else {
		if ($j(field[0]).attr("type") == "checkbox"){
			// checkbox
			// options separated by new line character
			$j.each(field, function(index, element){
				var self = $j(element);
				if (field_data.value.indexOf(self.attr("value")) > -1){
					self.prop("checked", true);
				}
			});
		} else if ($j(field[0]).attr("type") == "radio") {
			//radio
			// option is seleceted by the text of the option
			$j.each(field, function(index, element){
				var self = $j(element);
				if(field_data.value.indexOf(self.attr("value")) > -1){
					self.prop("checked", true);
				}
			});
		} else if (field.length == 4 && field[1].nodeName == "SELECT"){
			// date
			options = field.find("option");

			var d = new Date(field_data.value);

			// day
			var day = d.getDate();

			// month
			var month = d.getMonth();

			// year
			var year = d.getFullYear();

			$j.each(field, function(index, element){
				var self = $j(element);
				var options = self.find("option");
				if (self.attr("name").indexOf("M") > -1){
					self.find("option:eq(" + (month + 1) + ")").attr("selected", true);
				} else if (self.attr("name").indexOf("D") > -1){
					$j.each(options, function(index, e){
						var self = $j(e);
						if (String(day) === self.attr("value")){
							self.attr("selected", true);
						}
					});									
				} else if (self.attr("name").indexOf("Y") > -1){
					$j.each(options, function(index, e){
						var self = $j(e);
						if (String(year) == self.attr("value")){
							self.attr("selected", true);
						}
					});									
				}
			});
		} else {
			console.log(field);
			console.log(field.length)
		}
	}

}