I just wonder when I write this.root = this.app.root.findByName(‘Root’) in UI script line 6, and want to use joinButton.button.on to active this.root.script.enabled = true, but it will show error which this.root is undefined. but later, I write this.root = this.app.root.findByName('Root') under
Ui.prototype.update = function (dt) {
and work!!! Why can’t I write this.root = this.app.root.findByName(‘Root’) in line 6? Please help me.
if I have this problem, I place all content inside the initilize, but I would prefer use Input instead of button
Ui.protoype.initialize=function(){
this.joinButton=this.app.root.findByName("Join");
//if use button element
this.joinButton.button.on("click",this.click,this);
//if use Input=true in element
this.joinButton.element.on("click",this.click,this);
}
Ui.protoype.click=function(){
console.log("hihi joinButtonIscliked");
};
You do not need to search for root entity - it is already provided to you via this.app.root.
You are trying to find “Root” entity inside a root entity, which won’t work.
Also, you should move your code from inside the update() method to initialize(). Subscribing to events in update() method will cause a new subscription each frame. Please refer to the manual on using scripts:
It is because of the way you are using this keyword inside a function. this always points to the current scope, so in that case points to function(event) {} scope, which is a global window, which has no app property in it. You need to reference it from outside, like:
var app = this.app;
button.on('click', function(event) {
app.root...
});
thank your reply. I add var app = this.app , and also refer app.root. but there is no script element under app.root. if console.log(app.root.script), it will show undefined.
Yes, my mistake, the app.root is pointing to the very first entity, which holds “Root” entity. So your initial search was correct: this.app.root.findByName("Root").
but strange is: when I use this.root=this.app.root.findByName(“Root”), there will be error if this.root.script.enabled=true; there is script element under Root, but there is not enabled method. I am curious if I want to use this.root. How can I find script.enabled?
Do you use this code inside the button event? If that’s the case I suggest to do it before the button event. If that’s not the case, could you share the error or a link of your project please?
