Added binding convert option.

apps/tests/app/binding_tests.ts

@@ -0,0 +1,61 @@
+import pageModule = require("ui/page");
+//import stackLayoutModule = require("ui/layouts/stack-layout");
+//import textFieldModule = require("ui/text-field");
+import observableModule = require("data/observable");
+import bindableModule = require("ui/core/bindable");
+//import enums = require("ui/enums");
+import trace = require("trace");
+trace.setCategories(trace.categories.Test);
+trace.enable();
+
+export function pageLoaded(args: observableModule.EventData) {
+    var page: pageModule.Page = <pageModule.Page>args.object;
+    var model = new observableModule.Observable();
+    //var model = page.bindingContext;
+    model.set("paramProperty", "%%%");
+    var toUpperConverter: bindableModule.ValueConverter = {
+        toModel: function (value, param1) {
+            return param1 + value.toLowerCase();
+        },
+        toView: function (value, param1) {
+            return value.toUpperCase();
+        }
+    };
+    model.set("toUpper", toUpperConverter);
+    model.set("testProperty", "Alabala");
+
+    page.bindingContext = model;
+}
+
+//export function createPage() {
+//    var stackLayout = new stackLayoutModule.StackLayout();
+//    var firstTextField = new textFieldModule.TextField();
+//    firstTextField.updateTextTrigger = enums.UpdateTextTrigger.textChanged;
+//    var secondTextField = new textFieldModule.TextField();
+//    secondTextField.updateTextTrigger = enums.UpdateTextTrigger.textChanged;
+
+//    var model = new observableModule.Observable();
+
+//    var bindOptions: bindableModule.BindingOptions = {
+//        sourceProperty: "testProperty",
+//        targetProperty: "text",
+//        twoWay: true,
+//        expression: "testProperty | toUpper('$$$')"
+//    };
+
+//    firstTextField.bind(bindOptions, model);
+//    secondTextField.bind({
+//        sourceProperty: "testProperty",
+//        targetProperty: "text",
+//        twoWay: true
+//    }, model);
+
+//    stackLayout.addChild(firstTextField);
+//    stackLayout.addChild(secondTextField);
+
+//    var page = new pageModule.Page();
+//    page.on("loaded", pageLoaded);
+//    page.content = stackLayout;
+//    page.bindingContext = model;
+//    return page;
+//}

apps/tests/app/binding_tests.xml

@@ -0,0 +1,7 @@
+<Page xmlns="http://www.nativescript.org/tns.xsd" loaded="pageLoaded">
+    <StackLayout padding="7">
+        <TextField text="{{ testProperty, testProperty | toUpper(paramProperty) }}" />
+        <!--<TextField text="{{ testProperty | toUpper }}" />-->
+        <TextField text="{{ testProperty }}" />
+    </StackLayout>
+</Page>