javascript - iron-form 2.0 in Polymer 2 element: function not defined -


trying replicate on of iron-form demos https://www.webcomponents.org/element/polymerelements/iron-form/demo/demo/index.html inside polymer 2 element, , can't seem working.

when clicking submit, uncaught referenceerror: _delayedsubmit not defined. suggestions?

jsbin: https://jsbin.com/pinasum/edit?html,console,output

code:

<dom-module id="spp-login">     <template>         <iron-form id="loginform">             <form action="/login" method="post">                 <paper-input name="username" label="username" required auto-validate></paper-input>                 <paper-input name="password" label="password" required auto-validate></paper-input>                  <paper-button raised onclick="_delayedsubmit(event);" disabled id="loginformsubmit">                     <paper-spinner id="spinner" hidden></paper-spinner>                     submit                 </paper-button>                 <paper-button raised onclick="loginform.reset();">reset</paper-button>             </form>             <div class="output"></div>         </iron-form>     </template>      <script>       class spplogin extends polymer.element {          static is() {           return 'spp-login';         }          static properties() {           return {             username: string,             password: string,           };         }          connectedcallback() {           super.connectedcallback();           const loginform = this.$.loginform;           const spinner = this.$.spinner;           const loginformsubmit = this.$.loginformsubmit;            loginform.addeventlistener('iron-form-submit', (event) => {             this.queryselector('.output').innerhtml = json.stringify(event.detail);             spinner.active = false;             spinner.hidden = true;             loginformsubmit.disabled = false;           });           loginform.addeventlistener('change', (event) => {             loginformsubmit.disabled = !loginform.validate();           });            loginform.addeventlistener('iron-form-presubmit', (event) => {             event.preventdefault();             console.log('here');           });         }          _delayedsubmit(event) {           const loginform = this.$.loginform;           const spinner = this.$.spinner;           spinner.active = true;           spinner.hidden = false;           loginform.disabled = true;           // simulate slow server response.           settimeout(function() {             loginform.submit();           }, 1000);         }       }        window.customelements.define(spplogin.is, spplogin);     </script> </dom-module>

to add event listeners dom elements, have use on-event annotations in template. also, whether provide name event object or not, event object being passed callback. polymer doesn't support passing arguments in event attributes.

the examples shown in iron-form demo page using demo-snippet, works both native elements polymer elements.

so, need change code from: onclick="_delayedsubmit(event);" to: on-click="_delayedsubmit".


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