Widget Definition

Each widget.js file must have a call to the Stage.defineWidget global function.

Example

The following code demonstrates how easy it is to create a simple widget. You can copy this code and put it in a widget.js file to produce a fully working widget. See the previous section for the directory structure guidelines.

Stage.defineWidget({
    id: 'my-widget',
    name: 'My Widget',
    description: 'This widget displays "Hello World!" text',
    isReact: true,
    categories: [Stage.GenericConfig.CATEGORY.OTHERS],
    permission: Stage.GenericConfig.CUSTOM_WIDGET_PERMISSIONS.CUSTOM_ALL,

    render: function(widget, data, error, toolbox) {
        return (
            <span>Hello World!</span>
        );
    }    
});

Widget Settings

As seen in the example above, there are some configuration fields that you can provide when you design a widget.

The Stage.defineWidget function receives a settings object with the options described in this table.

initialConfiguration

initialConfiguration supports 4 generic pre-made configuration fields:

• Stage.GenericConfig.POLLING_TIME_CONFIG(int) - How often to refresh the data (in seconds)
• Stage.GenericConfig.PAGE_SIZE_CONFIG(int) - The initial number of rows (page size) for widgets presenting data in tabular view. If value not provided, then page size is set to 5
• Stage.GenericConfig.SORT_COLUMN_CONFIG(string) - Column name to sort by
• Stage.GenericConfig.SORT_ASCENDING_CONFIG(boolean) - Change sorting order (true=ascending)

In addition to listed above, you can create your own configuration fields. Example of configuration with user-defined fields:

    initialConfiguration: [
        Stage.GenericConfig.PAGE_SIZE_CONFIG(3),
        {id: 'username', name: 'Fetch with', placeHolder: "GitHub user", description: "...", default: "cloudify-examples", type: Stage.Basic.GenericField.STRING_TYPE},
        {id: 'filter', name: 'Filter', placeHolder:"GitHub filter", description: "...", default: "blueprint in:name NOT local", type: Stage.Basic.GenericField.STRING_TYPE},
        {id: "displayStyle", name: "Display style", items: [{name:'Table', value:'table'}, {name:'Catalog', value:'catalog'}], default: "catalog", type: Stage.Basic.GenericField.LIST_TYPE},
        Stage.GenericConfig.SORT_COLUMN_CONFIG('created_at'),
        Stage.GenericConfig.SORT_ASCENDING_CONFIG(false)
    ]

Full list of available configuration field types (value of type property) you can see in the Widget Components Reference) at GenericField component page in Cloudify UI Components documentation.

Configuration fields values can be fetched in render method using widget.configuration object. See Accessing data in render() for details.

fetchUrl

There are two primary ways of polling data from remote sources: fetchUrl and fetchData().

fetchUrl is an object member and may be defined either as a string or an object with multiple string properties (property:URL) where each property represents a separate URL to query.

The following special strings are allowed to be used in URLs: [manager], [backend], [params]. Description for each one of them is provided later in this section.

Single URL

A single URL results are available directly in the data object.

fetchUrl:  'localhost:50123/public/nodes'
// ...
render: function(widget, data, error, toolbox) {
    let your_data = data;
    //...
}

Mulitple URL

In case fetchUrl is defined with multiple URLs, the results are accessible by the property name of this URL (i.e. data.nodes).

fetchUrl: {
    nodes: '[manager]/nodes?_include=id,deployment_id,blueprint_id,type,type_hierarchy,number_of_instances,host_id,relationships,created_by[params:blueprint_id,deployment_id,gridParams]',
    deployments: '[manager]/deployments?_include=id,groups[params:blueprint_id,id]'
}
// ...
render: function(widget, data, error, toolbox) {
    let nodes = data.nodes.items;
    let deployments = data.nodeInstances.items; 
    //...
}

As seen in the example above, URLs provided in fetchUrl can be parametrized with several special tokens:

fetchUrl: '[manager]/executions?is_system_workflow=false[params]'

• The [manager] token is replaced with the current Cloudify Management Console backend IP address and call is forwarded to Cloudify Manager’s REST API.
• The [backend] token is replaced with the current Cloudify Management Console backend IP address.
• The [params] token, on the other hand, is quite special. This placeholder can be expanded into a number of things depending on usage:
  • [params] alone anywhere in the URL is expanded to default pagination parameters (_size, _offset, _sort) if available (see initialConfiguration). This mode is inclusive - all params available in the widget is appended to URL.
  • [params:param_name1(,param_name2)] is replaced with “&paramName1:paramValue1” in the URL. Please note that this can be used both to selectively pick pagination parameter as well as custom parameters (see fetchParams function). This mode is exclusive - parameters not specified explicitly are skipped. When using selective param picking ([params:param_name]) you can use a pre-defined gridParams tag to include all pagination parameters (_size, _offset, _sort) instead of specifying explicitly each of the three.

Inclusive Params

The following example illustrates fetchUrl with both tokens along with their URL:

initialConfiguration: [
    Stage.GenericConfig.POLLING_TIME_CONFIG(60),
    Stage.GenericConfig.PAGE_SIZE_CONFIG(),
    Stage.GenericConfig.SORT_COLUMN_CONFIG('column_name'),
    Stage.GenericConfig.SORT_ASCENDING_CONFIG(false)
],
fetchUrl: {
    nodes: '[manager]/nodes[params]'
},
fetchParams: function(widget, toolbox) {
    return {
        sampleFuncParam: 'dummy'
    }
}

Result URL: http://<MANAGER_IP>/sp/?su=/api/v3.1/nodes?&_sort=-column_name&_size=5&_offset=0&sampleFuncParam=dummy

This url can be divided into separate parts:

Exclusive Params

The same URL, this time with explicit param names (and the gridParams tag):

initialConfiguration: [
    Stage.GenericConfig.POLLING_TIME_CONFIG(60),
    Stage.GenericConfig.PAGE_SIZE_CONFIG(),
    Stage.GenericConfig.SORT_COLUMN_CONFIG('column_name'),
    Stage.GenericConfig.SORT_ASCENDING_CONFIG(false)
],
fetchUrl: {
    nodes: '[manager]/nodes[params:sampleFuncParam,gridParams]'
//  which is essentially the same as
//  nodes: '[manager]/nodes[params:sampleFuncParam,_size,_offset_,_sort]'
},
fetchParams: function(widget, toolbox) {
    return {
        sampleFuncParam: 'dummy'
    }
}

Result URL: http://<MANAGER_IP>/sp/?su=/api/v3.1/nodes?&sampleFuncParam=dummy&_sort=-column_name&_size=5&_offset=0

Widget Functions

The following functions are available to be defined for custom widgets (they must be provided as properties of object passed to Stage.defineWidget function).

init()

Called when the widget definition is loaded, which occurs after the system is loaded. Can be used to define certain elements, for example classes and objects that are used in the widget definition.

render(widget, data, error, toolbox)

Called each time that the widget needs to draw itself. This can occur when the page is loaded, widget data is changed, context data is changed, widget data is fetched, and so on.

render parameters are:

• The widget object itself
• The fetched data, either using fetchUrl or fetchData. The data is null if fetchData or fetchUrl is not specified. The data will also pass null to the render method until data is fetched. If you are expecting data, you can render a “loading” indicator.
• The error if data fetching failed
• The toolbox object.

render() is focal to the appearance of the widget. The return value of this function should be one of these:

• JSX code (when isReact parameter is set to true) to be rendered by ReactJS engine
• HTML string (when isReact parameters is set to false) to be injected directly as HTML

The following examples illustrates typical usages of render function.

Rendering ReactJS components

When isReact parameter is set to true:

render: function(widget, data, error, toolbox) {
    return (
        <span>Hello World!</span>
    );
}

You can learn how to render ReactJS elements and components starting from here.

Using ready components

Although using React DOM Elements (similar to plain HTML tags) gives you extreme flexibility, usually it is much quicker to design your widget with the use of Cloudify Management Console ready-made components. These components were designed with Console uniformity and ease-of-use in mind, and as are very easy to learn and use.

The following example illustrates how to use a KeyIndicator component:

render: function(widget, data, error, toolbox) {
    let { KeyIndicator } = Stage.Basic;
    
    return (
        <KeyIndicator title='User Stars' icon='star' number={3} />
    );
}

Notice that the KeyIndicator component is imported into the widget. It is defined in the render method as:

const { KeyIndicator } = Stage.Basic;

You can also import multiple components in the same line, for example:

const { KeyIndicator, Checkmark } = Stage.Basic;

Description of other built-in components is available here.

Rendering HTML (plain JavaScript)

When isReact parameter is set to false:

render: function(widget, data, error, toolbox) {
    return "<span>Hello World!</span>";
}

HTML template

The widget template is an html file (widget.html) written with lodash template engine.

Widget template is fetched when the widget definition is loaded (only if hasTemplate parameter is set to true). The template is passed to the render function through widget argument. To access it use widget.definition.template.

To render the template using the built in lodash templates engine use _.template(widget.definition.template)(data);, where ‘data’ is any context you want to pass on to the template. For example, a simple render function looks like this:

render: function(widget, data, error, toolbox) {
    if (!widget.definition.template) {
        return 'missing template';
    }
    return _.template(widget.definition.template)(data);
}

Accessing data

There can be several independent data sources for your widget. Two most commonly used are the configuration and data objects. The following example illustrates how to access both of them:

Stage.defineWidget({
    id: 'my-widget',
    name: 'My widget',
    description: 'This widget polls data from two different sources',
    isReact: true,
    initialConfiguration: [
        {id: 'confText', name: 'Conf Item',  placeHolder: 'Configuration text item', default: 'Conf text', type: Stage.Basic.GenericField.STRING_TYPE}
    ],
    permission: Stage.GenericConfig.CUSTOM_WIDGET_PERMISSIONS.CUSTOM_ALL,

    fetchData: function(widget, toolbox, params) {
        return Promise.resolve({fetchedText: 'Fetched text'});
    },

    render: function(widget, data, error, toolbox) {
        let {Loading} = Stage.Basic;

        if (_.isEmpty(data)) { // Make sure the data is already fetched, if not show a loading spinner
            return (<Loading message='Loading data...'></Loading>);
        } else {  
            return (
                <div>
                    <p>confItem value: {widget.configuration.confText}</p>
                    <p>fetchedText value: {data.fetchedText}</p>
                </div>
            );
        }
    }
});

The above widget will display two lines containing the strings defined in the data sources: “Conf text” and “Fetched Text”. Please note how the widget makes sure data has been loaded has completed before rendering it. Skipping this check would result in an error in browser console.

Default value of initialConfiguration fields, as the name suggests, is only used if there are no user defined values for these properties. A user can change them by entering the Edit Mode where he can modify widget’s configuration. From that point, the current widget will use the value provided by the user. To reset it to it’s default value, the widget must be removed and re-added to the page.

Moreover, please remember to remove and re-add the widget to the dashboard if changing the initialConfiguration field. It is only loaded for newly ‘mounted’ widgets.

postRender(container, widget, data, toolbox)

Non-React widgets only.

postRender is called immediately after the widget has been made visible in the Cloudify Management Console. This function has access to the same objects as the render function with one addition - the container object containing a reference to the widget’s container (parent) object.

fetchData(widget, toolbox, params)

An alternative to using fetchUrl is the fetchData() function. It provides greater flexibility when you need to pre-process your results or chain them into nested Promises (ie. pull a list of URLs and resolve each of those URLs).

fetchData() parameters are:

• widget object
• toolbox object
• params object (see fetchParams() function)

The return value for fetchData() is expected to be a Promise. As such if you would like to return a primitive value you would need to wrap it in a promise:

fetchData: function(widget, toolbox, params) {
    return Promise.resolve({key:value});
}

Please note that should the result be a single primitive value you still need to return it as a property of an Object, since referencing the Object directly is illegal in ReactJS. With this in mind, the following example would not work:

// THIS WILL NOT WORK
fetchData: function(widget, toolbox, params) { 
    return 10; 
},

render: function(widget, data, error, toolbox){ 
    return (
        <div>
            {data}  // This will produce a runtime error
        </div>
    )
}

Instead, you can return the int value as a property of the object like so:

fetchData: function(widget, toolbox, params) { 
    return {myInt: 10}; 
},
render: function(widget, data, error, toolbox) { 
    return (
        <div>
            {data.myInt}  // OK
        </div>
    )
}

Note: fetchUrl and fetchData() are mutually exclusive, that is if you define fetchUrl in your widget, then fetchData() definition is ignored.

fetchParams(widget, toolbox)

fetchParams() function delivers query parameters to

• fetchData() - can be accessed using params argument of the function,
• fetchUrl - can be accessed using [params] wildcard in URL.

Example for fetchUrl:

fetchUrl: '[manager]/nodes[params]',
fetchParams: function(widget, toolbox) {
    let deploymentId = toolbox.getContext().getValue('deploymentId');

    return {deployment_id: deploymentId};
}

Example for fetchData():

fetchData: function(widget, toolbox, params) {
    return toolbox.getManager().doGet('/nodes', params);
},
fetchParams: function(widget, toolbox) {
    let deploymentId = toolbox.getContext().getValue('deploymentId');

    return {deployment_id: deploymentId};
}