Implement local file upload with form.

This fixes the issue that after selecting a file it cannot
be uploaded directly again without selecting another
file in between.

my_modules/c1pjs-client/lib/serial.js

@@ -127,15 +127,19 @@ C1PSerialPort.prototype.setBinding = function(c, t, s, e)
     case "uploadSerial":
         this.bindings[s] = e;
         var serial = this;
-        e.addEventListener('change', function () {
-            var file = e.files[0];
+        e.onsubmit = function (event) {
+            var file = event.currentTarget[1].files[0];
+
             var reader = new FileReader();
             reader.onload = function () {
                 // serial.println("uploading " + file.name + "...");
                 serial.loadFile(file.name, reader.result, 0);
             };
             reader.readAsText(file);
-        });
+
+            // Prevent reloading of web page after form submission
+            return false;
+        };
         return true;
     default:
         break;

my_modules/c1pjs-client/templates/components.xsl

@@ -286,7 +286,12 @@
 					<div><xsl:value-of select="."/></div>
 				</xsl:when>
 				<xsl:when test="@type = 'file'">
-					<input class="{$APPCLASS}-{@class}" type="file" data-value="{$type},{$binding}"/>
+					<form class="{$APPCLASS}-{@class}" data-value="{$type},{$binding}">
+						<fieldset>
+							<input type="file"/>
+							<input type="submit" value="Load Local File" />
+						</fieldset>
+					</form>
 				</xsl:when>
 				<xsl:when test="@type = 'separator'">
 					<hr/>