Button Component Reference

The button component responds to a click from the user. When the user clicks a Button, its status will change. In addition, users can assign a custom behavior to buttons' click event.

button.png

button-color

Click the Add Component button at the bottom of the Properties panel and select Button from Add UI Component. Then you can add the Button component to the node.

Button Property

Property Function explanation
Interactable Boolean type, if set to false then the Button component enters the forbidden state.
enableAutoGrayEffect Boolean type, if set to true, the Button's target sprite will turn gray when interactable is false. Don't take effect when Transition type is SPRITE and the disabledSprite property is exists.
Transition Enumeration type, including NONE, COLOR and SPRITE. Each type corresponds to a different Transition setting. Please see the Button Transition section below for details.
Click Event Default list type is null. Each event added by the user is composed of the node reference, component name and a response function. Please see the Button Event section below for details.

Note: When Transition is SPRITE and the disabledSprite property has a spriteFrame associated with it, the Enable Auto Gray Effect property is ignored at this time.

Button Transition

Button Transition is used to indicate the status of the Button when clicked by the user. Currently the types available are NONE, COLOR, SPRITE and SCALE.

transition

Color Transition

color-transition

Property Function Explanation
Normal Color of Button under Normal status.
Pressed Color of Button under Pressed status.
Hover Color of Button under Hover status.
Disabled Color of Button under Disabled status.
Duration Time interval needed for Button status switching.

Sprite Transition

sprite-transition

Property Function Explanation
Normal SpriteFrame of Button under Normal status.
Pressed SpriteFrame of Button under Pressed status.
Hover SpriteFrame of Button under Hover status.
Disabled SpriteFrame of Button under Disabled status.

Scale Transition

scaleTransition

Property Function Explanation
Duration Time interval needed for Button status switching.
ZoomScale When user press the button, the button will zoom to a scale.The final scale of the button equals (button original scale * zoomScale), zoomScale could be negative value.

Button Click Event

The Button can additionally add a Click event to respond to the player's click action. There are two ways to do this.

Add a callback throught the Properties.

button-event

No. Property Function Explanation
1 Target Node with the script component.
2 Component Script component name.
3 Handler Assign a callback function which will be triggered when the user clicks the Button.
4 customEventData A user-defined string value passed as the last event argument of the event callback.

Add a callback through the script.

There are two ways to add a callback through the script.

  1. The event callback added by this method is the same as the event callback added by the editor, all added by Button component. First you need to construct a cc.Component.EventHandler object, and then set the corresponding target, component, handler and customEventData parameters.

     // here is your component file, file name = MyComponent.js 
     cc.Class({
         extends: cc.Component,
         properties: {},
    
         onLoad: function () {
             var clickEventHandler = new cc.Component.EventHandler();
             clickEventHandler.target = this.node; // This node is the node to which your event handler code component belongs
             clickEventHandler.component = "MyComponent";// This is the code file name
             clickEventHandler.handler = "callback";
             clickEventHandler.customEventData = "foobar";
    
             var button = node.getComponent(cc.Button);
             button.clickEvents.push(clickEventHandler);
         },
    
         callback: function (event, customEventData) {
             // here event is a Event object, you can get events sent to the event node node
             var node = event.target;
             var button = node.getComponent(cc.Button);
             // here the customEventData parameter is equal to you set before the "foobar"
         }
     });
    
  2. By button.node.on ('click', ...) way to add, this is a very simple way, but the way there are some limitations in the event callback which can not gets the screen coordinate point of the current click button.

     // Suppose we add an event handler callback to the onLoad method of a component and handle the event in the callback function:
    
     cc.Class({
         extends: cc.Component,
    
         properties: {    
             button: cc.Button
         },
    
         onLoad: function () {
             this.button.node.on('click', this.callback, this);
         },
    
         callback: function (button) {
             // do whatever you want with button
             // In addition, attention to this way registered events, can not pass customEventData
         }
     });
    

Continue on to read about ProgressBar Component reference.

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