Extends Inspector

Inspector is a component control interface that is displayed in the Properties panel. Sometimes it is necessary to define an Inspector for a custom compomnent, and display it in a custom way. For example, the special form of a Widget component is designed by extending the Inspector.

extend inspector

The steps are as follows:

  1. Include the custom Inspector entry file in the component.
  2. Create an extension package for the custom Inspector.
  3. Write the custom Inspector entry file in the extension package.

Register Inspector entry

First, define a Component script, and this script should use the custom Inspector. Example:

cc.Class ({
  name: 'Foobar',
  extends: cc.Component,
  editor: {
    inspector: 'packages: //foobar/inspector.js',
  properties: {
    foo: 'Foo',
    bar: 'Bar'


  1. Here an editor field and the inspector entry file is defined in this field. inspector.js will generate the corresponding frame.
  2. In the inspector entry file, use the packages:// protocol to define the path to the entry file. In Cocos Creator the packages:// protocol plus the package name is mapped to the extension package folder.

Create a custom Inspector extension package

Next, create an extension package in the normal workflow. Follow the your first expansion package guide. For the same of an example, assume the extension package is called foobar.

Note: after creating the extension package, it is necessary to restart Cocos Creator so that the Inspector in extension package can be read correctly (not required for other extension functions).

Writing a custom Inspector entry file in the extension package

Next, define inspector.js in the foobar package:

Vue.component ('foobar-inspector', {
  template: `
    <ui-prop v-prop = "target.foo"> </ ui-prop>
    <ui-prop v-prop = "target.bar"> </ ui-prop>

  props: {
    target: {
      twoWay: true,
      type: Object,

Cocos Creator's Inspector extension uses vuejs for UI. A vue component was defined above and props was set in the component so that it contains target data to complete the entire Inspector data definition.

The target is an instance of our Foobar class in the Inspector.

About target

The target instance mentioned in the previous section is the target that has been processed by the Inspector.

When using target, it is not simply enough to think that target.foo contains the value of foo. Looking in Chrome DevTools and check target.foo, notice that it's an object rather than a Foo string that was defined at the beginning. The object contains attrs, type, value and other information. Where value is the value that is necessary to obtain.

The purpose of doing so is to make Inspector better access to all aspects of data visualization information. For example, when defining the properties of cc.Class:

properties: {
    //There is a Default, Get or Set value need to be assigned.
    foo: {
        default: 'Foo',
        readonly: true

This time in the Inspector notice that target.foo.value is Foo, and target.foo.attrs.readonly is true. This information helps to create various interface combinations.

About attribute binding

Because this information is very cumbersome, Cocos Creator contains some expansion for Vue directives, including v-prop, v-value, v-readonly and v-disable.

When using Cocos Creator's default scheme to display the data segment, use v-prop with the <ui-prop> control to do the binding:

<ui-prop v-prop = "target.foo"> </ui-prop>

When using the native control of <ui-xxx>, use v-value for data binding. Example:

<ui-input v-value = "target.foo.value"> </ui-input>

To apply readonly or disable behavior to a control, use v-readonly and v-disable. Example:

<ui-button v-readonly = "target.foo.attrs.readonly"> Foo </ui-button>
<ui-button v-disable = "target.bar.value"> Bar </ui-button>

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