This simple Wicket component allows you to easily render a Vue 3 app in Java. This component is implemented in about just 130 lines of code (including Java, HTML and js), so there is no risk in using it.
Suppose that you want a Vue app on an HTML page like below:
<script src="https://.../vue.js"></script>
<div id="app1"></div>
<script>
var app = Vue.createApp({
data() {
return {a: 4, b: "Hi"};
},
template: `<span @click='m1()'>{{a}} {{b}}<span>`,
methods {
m1() {
console.log(this.a);
}
},
});
app.mount('#app1')
</script>And you want to generate this from a Wicket page. To do that, you can use the WicketVueApp component provided by this project.
First, add the dependency:
<dependency>
<groupId>com.ttdev</groupId>
<artifactId>wicket-vue-app-core</artifactId>
<version>1.0.2</version>
</dependency>Your Wicket page should be like:
import com.ttdev.WicketVueApp;
public class GetStartedDemo extends WebPage {
public GetStartedDemo() {
HashMap<String, Object> state = new HashMap<>();
state.put("a", 4);
state.put("b", "Hi");
WicketVueApp vwa=new WicketVueApp("wva",
new Model(state),
"m1() {console.log(this.a);}");
add(vwa);
}
}The template is provided in the HTML markup:
<html>
<body>
<div wicket:id="wva">
<span @click='m1()'>{{a}} {{b}}<span>
</div>
</body>
</html>The WicketVueApp component will generate the desired HTML and js code inside the <div> automatically.
Now, run your Wicket webapp as usual and you will see the Vue app working on your Wicket page.
In the example above, suppose that you want to handle the click on the server side (Wicket), all you need to do is to call a js method named "cb" (standing for "call back") as shown below:
<html>
<body>
<div wicket:id="wva">
<span @click='cb()'>{{a}} {{b}}<span>
</div>
</body>
</html>This cb method will use Wicket's ajax mechanism to send the request to the Wicket side, where you can handle it by overriding the OnVueEvent method:
public class GetStartedDemo extends WebPage {
public GetStartedDemo() {
HashMap<String, Object> state = new HashMap<>();
state.put("a", 4);
state.put("b", "Hi");
WicketVueApp vwa=new WicketVueApp("wva",
new Model(state)) {
@Override
public void onVueEvent(AjaxRequestTarget target, Map<String, Object> data) {
state.put("b", state.get("b")+"!");
}
};
add(vwa);
}
}The cb method will automatically send the current state of the Vue app back to the WicketVueApp component on server, which will use the data to update itself own state, before calling its onVueEvent method. This way you will have access to the latest state of the Vue app in the browser.
In this method you can further modify the state, which will be sent back to the browser automatically to refresh the Vue app. Here, in this example, the "b" variable's value will have an exclamation mark added to it.
Note that the AjaxRequestTarget one of the parameters, you can add other ajax Wicket components to the target to have them refreshed.
To further fine-tune its behaviour, please take a look at the examples
- Calling different Java methods on different Vue events.
- Use Quasar components.
- Have multiple Vue Apps on a single web page. This
also shows how to tell WicketVueApp not to output the
<script>element for Vue js. - Refresh a Vue App when handling a normal Wicket Ajax event.
You can contact me at [email protected].