4.6.5.2. Working With Data

In order to load data just place some of cuba-data elements in HTML and specify required attributes.

Entities Loading

Use cuba-entities to load entities. Once entity-name and view attributes are specified the element loads list of entities and exposes it to the Polymer data binding via data property:

<cuba-entities entity-name="sec$User" view="_local" data="{{users}}"></cuba-entities>

Then you can display the data as simple as:

<template is="dom-repeat" items="[[users]]" as="user">
  <div>[[user.login]]</div>
</template>

Entities Querying

Define a query as described here.

Use cuba-query element to retrieve query results. You can optionally pass parameters using params property:

<cuba-query id="query"
            auto="[[auto]]"
            entity-name="sec$User"
            query-name="usersByName"
            data="{{users}}">
</cuba-query>

<template is="dom-repeat" items="[[users]]" as="user">
  <div>[[user.login]]</div>
</template>

Service Invocation

Expose a service and it’s method as described here. Use cuba-service element to invoke the method:

<cuba-service service-name="cuba_ServerInfoService"
              method="getReleaseNumber"
              data="{{releaseNumber}}"
              handle-as="text"></cuba-service>

Release number: [[releaseNumber]]

Entity Creation

cuba-entity-form and cuba-service-form elements facilitate sending data to the backend.

In the example below we bind user object which should be persisted to the entity property.

<cuba-entity-form id="entityForm"
                  entity-name="sec$User"
                  entity="[[user]]"
                  on-cuba-form-response="_handleFormResponse"
                  on-cuba-form-error="_handleFormError">

  <label>Login: <input type="text" name="login" value="{{user.login::input}}"></label>
  <label>Name: <input type="text" name="login" value="{{user.name::input}}"></label>

  <button on-tap="_submit">Submit</button>

</cuba-entity-form>

<paper-toast id="successToast">Entity created</paper-toast>
<paper-toast id="errorToast">Entity creation error</paper-toast>
_submit: function() {
  this.$.entityForm.submit();
},
_handleFormResponse: function() {
  this.user = getUserStub();
  this.$.successToast.open();
},
_handleFormError: function() {
  this.$.errorToast.open();
}
Tip

You should enable anonymous access in the REST API if you want to use the examples above without forcing users to log in.