Added a validate file option and included documentation.

ignite-html-validate.js

@@ -173,6 +173,8 @@ IgniteTemplate.prototype.validate = function (callback) {
             value = this.element.checked;
         } else if (type == "number") {
             value = Number(this.element.value);
+        } else if (type == "file") {
+            value = this.element.files;
         } else if (this.element.hasAttribute("contenteditable") && this.element.getAttribute("contenteditable").toLowerCase().trim() == "true") {
             value = this.element.textContent;
         } else {
@@ -327,6 +329,19 @@ IgniteTemplate.prototype.validateMatches = function (compare, msg) {
     });
 }
 
+/**
+ * Validates an input to make sure it contains at least one file file.
+ * @param {string|Function|IgniteProperty} msg The message to display when a file has not been selected.
+ * @returns {IgniteTemplate} This ignite template.
+ */
+IgniteTemplate.prototype.validateFile = function(msg) {
+    return this.validate((value, error) => {
+        if (!value || value.length == 0) {
+            return error(msg ? msg : 'Must select a file to upload.');
+        }
+    });
+}
+
 /**
  * Validates this element and all the children within the element.
  * @returns {Boolean} Whether or not this element and all children in this element are valid.