Wednesday, October 5, 2016

GWT RC2 with Polymer: Issue while calling click handler from Java.

Hi All,

I am using below code for creating my custom element, 

package com.test;

import jsinterop.annotations.JsConstructor;
import jsinterop.annotations.JsMethod;
import jsinterop.annotations.JsType;

import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.Button;

@JsType(namespace = "ctb")
public class CustomGWTButton{
@JsConstructor
public CustomGWTButton() {
}
@JsMethod
public Button getButton(){
//#1 java handler not working
return new Button("Test11", new ClickHandler() {
@Override
public void onClick(ClickEvent event) {
Window.alert("How are you?");
}
});
}
}


<link rel="import" href="bower_components/paper-button/paper-button.html"/>
<dom-module id="gwt-button">
<style>
</style>
<template>
<h1>Hello</h1>
<div id="buttonId"/>
</template>
<script>
Polymer({
is: "gwt-button",
attached: function(){
var obj = new ctb.CustomGWTButton();
var button = obj.getButton();
//#2 not working 
button.onclick = function(){
alert('Not Working Fine!!');
}
var line = document.createElement("p");
line.innerHTML = button;
document.getElementById("buttonId").appendChild(line);
//when I do like this, it is working
var ch = line.childNodes[0];
ch.onclick = function(){
alert('Working Fine!!');
}
}
});
</script>
</dom-module>

Below issues I am facing (RED COLOR handlers not working):
1. Click handler defined in java class not working (#1).
2. Then I tried to add onclick in javascript (#2) but it also didnt worked for me.
3. then I again added onclick Handler in javascrpt (#3), It worked for me. 

Can you please help me, How I can make work java handler #1 and #2 handler here.

Thanks,
Gaurav

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