Polymer 2 new page getting 404 - html

Question

I've followed polymer guide to create a new page: https://www.polymer-project.org/2.0/start/toolbox/create-a-page. But when I click on the nav menu item "New view" I get "Oops you hit a 404. Head back to home." instead of my new view. I tried to edit the existing pages and everything seems to work fine, but my new page isn't. My files are exactly like the tutorial, I checked it a lot.
my-app.html:
<!--
#license
Copyright (c) 2016 The Polymer Project Authors. All rights reserved.
This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
Code distributed by Google as part of the polymer project is also
subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
-->
<link rel="import" href="../bower_components/polymer/polymer-element.html">
<link rel="import" href="../bower_components/app-layout/app-drawer/app-drawer.html">
<link rel="import" href="../bower_components/app-layout/app-drawer-layout/app-drawer-layout.html">
<link rel="import" href="../bower_components/app-layout/app-header/app-header.html">
<link rel="import" href="../bower_components/app-layout/app-header-layout/app-header-layout.html">
<link rel="import" href="../bower_components/app-layout/app-scroll-effects/app-scroll-effects.html">
<link rel="import" href="../bower_components/app-layout/app-toolbar/app-toolbar.html">
<link rel="import" href="../bower_components/app-route/app-location.html">
<link rel="import" href="../bower_components/app-route/app-route.html">
<link rel="import" href="../bower_components/iron-pages/iron-pages.html">
<link rel="import" href="../bower_components/iron-selector/iron-selector.html">
<link rel="import" href="../bower_components/paper-icon-button/paper-icon-button.html">
<link rel="import" href="my-icons.html">
<link rel="lazy-import" href="my-view1.html">
<link rel="lazy-import" href="my-view2.html">
<link rel="lazy-import" href="my-view3.html">
<link rel="lazy-import" href="my-new-view.html">
<link rel="lazy-import" href="my-view404.html">
<dom-module id="my-app">
<template>
<style>
:host {
--app-primary-color: #4285f4;
--app-secondary-color: black;
display: block;
}
app-drawer-layout:not([narrow]) [drawer-toggle] {
display: none;
}
app-header {
color: #fff;
background-color: var(--app-primary-color);
}
app-header paper-icon-button {
--paper-icon-button-ink-color: white;
}
.drawer-list {
margin: 0 20px;
}
.drawer-list a {
display: block;
padding: 0 16px;
text-decoration: none;
color: var(--app-secondary-color);
line-height: 40px;
}
.drawer-list a.iron-selected {
color: black;
font-weight: bold;
}
</style>
<app-location
route="{{route}}"
url-space-regex="^[[rootPath]]">
</app-location>
<app-route
route="{{route}}"
pattern="[[rootPath]]:page"
data="{{routeData}}"
tail="{{subroute}}">
</app-route>
<app-drawer-layout fullbleed narrow="{{narrow}}">
<!-- Drawer content -->
<app-drawer id="drawer" slot="drawer" swipe-open="[[narrow]]">
<app-toolbar>Menu</app-toolbar>
<iron-selector selected="[[page]]" attr-for-selected="name" class="drawer-list" role="navigation">
<a name="view1" href="/view1">View One</a>
<a name="view2" href="/view2">View Two</a>
<a name="view3" href="/view3">View Three</a>
<a name="new-view" href="/new-view">New View</a>
</iron-selector>
</app-drawer>
<!-- Main content -->
<app-header-layout has-scrolling-region>
<app-header slot="header" condenses reveals effects="waterfall">
<app-toolbar>
<paper-icon-button icon="my-icons:menu" drawer-toggle></paper-icon-button>
<div main-title>My App</div>
</app-toolbar>
</app-header>
<iron-pages
selected="[[page]]"
attr-for-selected="name"
fallback-selection="view404"
role="main">
<my-view1 name="view1"></my-view1>
<my-view2 name="view2"></my-view2>
<my-view3 name="view3"></my-view3>
<my-new-view name="new-view"></my-new-view>
<my-view404 name="view404"></my-view404>
</iron-pages>
</app-header-layout>
</app-drawer-layout>
</template>
<script>
class MyApp extends Polymer.Element {
static get is() { return 'my-app'; }
static get properties() {
return {
page: {
type: String,
reflectToAttribute: true,
observer: '_pageChanged',
},
routeData: Object,
subroute: String,
// This shouldn't be neccessary, but the Analyzer isn't picking up
// Polymer.Element#rootPath
rootPath: String,
};
}
static get observers() {
return [
'_routePageChanged(routeData.page)',
];
}
_routePageChanged(page) {
// If no page was found in the route data, page will be an empty string.
// Default to 'view1' in that case.
this.page = page || 'view1';
// Close a non-persistent drawer when the page & route are changed.
if (!this.$.drawer.persistent) {
this.$.drawer.close();
}
}
_pageChanged(page) {
// Load page import on demand. Show 404 page if fails
var resolvedPageUrl = this.resolveUrl('my-' + page + '.html');
Polymer.importHref(
resolvedPageUrl,
null,
this._showPage404.bind(this),
true);
}
_showPage404() {
this.page = 'view404';
}
}
window.customElements.define(MyApp.is, MyApp);
</script>
</dom-module>
my-new-view.html:
<!-- Load the Polymer.Element base class -->
<link rel="import" href="../bower_components/polymer/polymer-element.html">
<dom-module id="my-new-view">
<!-- Defines the element's style and local DOM -->
<template>
<style>
:host {
display: block;
padding: 16px;
}
</style>
<h1>New viewwww</h1>
</template>
<script>
// Your new element extends the Polymer.Element base class
class MyNewView extends Polymer.Element {
static get is() { return 'my-new-view'; }
}
//Now, register your new custom element so the browser can use it
customElements.define(MyNewView.is, MyNewView);
</script>
</dom-module>

Answer 1

Seams all are fine like you have pointed polymer-project 's page but the only thing you need to correct. If you like to import your pages with lazy-import you need to move this lines between <dome-module> and <template>, something like:
...
<!--import all necessary library ABOVE as you did and PLUS below -->
<link rel="import" href="../lazy-imports-mixin.html">
...
<dom-module id="my-app">
<link rel="lazy-import" group="lazy" href="my-view1.html">
<link rel="lazy-import" group="lazy" href="my-view2.html">
<link rel="lazy-import" group="lazy" href="my-view3.html">
<link rel="lazy-import" group="lazy" href="my-new-view.html">
<link rel="lazy-import" group="lazy" href="my-view404.html">
<template>
...
And extend this element of Polymer.LazyImportsMixin :
class MyApp extends Polymer.LazyImportsMixin(Polymer.Element) {...
Please refer lazy-load syntax from here
Or you may simply import the pages at same place but without lazy-import like:
<link rel="import" href="my-view1.html">
<link rel="import" href="my-view2.html">
<link rel="import" href="my-view3.html">
<link rel="import" href="my-new-view.html">
<link rel="import" href="my-view404.html">

Answer 2

It's actually the function _pageChanged that does the importing, the lazy import stuff is just there to trick the linter.
That being said I can't see why it wouldn't work unless it's an issue with the server.
If you browse to your my-new-view.html page does that 404? If so the page is not being served. Also look in your console to see if it's throwing an error.

Answer 3

I guess the error is in function __Pagechanged and linked functions. See: it depends on name of your pages my- 'page '... I guess you should your page as 'my-number_of_page_-view ' or rewrite start code