The below code does not show in the browser. This works in Polymer 0.5. Is there code difference as I am using 1.0?:
<link rel="import" href="../bower_components/polymer/polymer.html">
<polymer-element name="my-name">
<template>
<h1> Hello {{name}}</h1>
</template>
<script>
Polymer('my-name', {
ready: function() {
this.name = "Brown";
}
});
</script>
</polymer-element>
Basically you need to rewrite your element based on the new requirements. You can easily follow it in the migration guide, registration element section.
You should rewrite it like following:
<dom-module id="my-name">
<template>
<!--Keep in mind in polymer 1.0 you can't have whitespaces in bound tags-->
<h1>Hello <span>{{name}}</span></h1>
</template>
<script>
Polymer({
is: "my-name",
ready: function () {
this.name = "Brown";
}
});
</script>
</dom-module>
I did a Plunker where you can reproduce it.
<link rel="import" href="../bower_components/polymer/polymer.html">
<dom-module id="my-name">
<style>
/*your styles go here*/
<style>
<template>
<!-- Things to show in element view -->
<h1> Hello <span>{{name}}</span></h1>
</template>
<dom-module>
<script>
// Your script goes here
Polymer({
is: 'my-name',
properties: {
name: {
type: String,
value: 'Brown'
}
}
});
</script>
There are many differences when migrating from Polymer 0.5 to Polymer 1.0 +. They changed the old polymer-element to dom-module and name attribute to id. The constructor is also changed as i shown in the example. Read https://www.polymer-project.org/1.0/docs/migration.html to get more info on migrating.
polymer 1.0 changes <polymer-element name="my-name"> to <dom-module id="my-name">.
I think you should follow the documentation of polymer 1.0
Polymer 1.0 documentation
Related
First off, I apologize for the title-gore. I struggled to summarize this issue in a single sentence.
I have a Polymer element. In my element, I wish to display (or simply log to console) the innerHTML of a template element that is a child of (contents of) the element instance.
(Please note that the intent here is to create an element similar to the demo-snippet of iron-demo-helpers.)
Consider the following Polymer element:
<link rel="import" href="../../polymer/polymer.html">
<dom-module id="print-contents-html">
<script>
Polymer({
is: 'print-contents-html',
attached: function() {
var template = Polymer.dom(this).queryDistributedElements('template')[0];
console.log(template.innerHTML);
}
});
</script>
</dom-module>
Very simply, I query for the 'template' element and log its inner HTML.
Now consider the following usage:
<!doctype html>
<html>
<head>
<script src="../../webcomponentsjs/webcomponents-lite.js"></script>
<link rel="import" href="./print-contents-html.html">
</head>
<body>
<print-contents-html>
<template>
Hello World
</template>
</print-contents-html>
</body>
</html>
As expected, this results in "Hello World" being logged to the console.
However, I am trying to make use of the 'print-contents-html' element within another Polymer element:
<link rel="import" href="../../polymer/polymer.html">
<link rel="import" href="./print-contents-html.html">
<dom-module id="simple-demo">
<template>
<print-contents-html>
<template>
Hello World from simple demo
</template>
</print-contents-html>
</template>
<script>
Polymer({
is: 'simple-demo',
});
</script>
</dom-module>
Now if I update the usage to also include an instance of the simple-demo element:
<!doctype html>
<html>
<head>
<script src="../../webcomponentsjs/webcomponents-lite.js"></script>
<link rel="import" href="./print-contents-html.html">
<link rel="import" href="./simple-demo.html">
</head>
<body>
<print-contents-html>
<template>
Hello World
</template>
</print-contents-html>
<simple-demo></simple-demo>
</body>
</html>
I would expect to see both "Hello World" and "Hello World from simple demo" logged to the console. However the simple demo message is not logged.
It appears that while the queryDistributedElements() does return the instance of the template element, the innerHTML field is an empty string.
Does anyone know why this is the case? That accessing the content/child template element does not have its innerHTML set?
Secondly, does anyone know of an alternative method through which I can access the innerHTML of the template element that is a content/child of a polymer element?
Kind Regards,
Andrew Butler
This issue is discussed in Polymer's Github repository.
The solution is to add a preserve-content attribute it the inner <template> tag:
<dom-module id="simple-demo">
<template>
<print-contents-html>
<template preserve-content>
Hello World from simple demo
</template>
</print-contents-html>
</template>
...
Then it works!
I have used this code in vaadin html file. But output is nothing.
Code refrence: https://vaadin.com/charts-for-polymer
Please let me know how to correct and implement in my vaadin design.
<!DOCTYPE html>
<head>
<script src="https://cdnjs.cloudflare.com/ajax/libs/webcomponentsjs/0.7.21/webcomponents-lite.min.js"></script>
<link rel="import" href="https://cdn.vaadin.com/vaadin-charts/3.0.0-alpha9/vaadin-
charts.html">
</head>
<body>
<template is="dom-bind" id="app">
<vaadin-pie-chart id="pie-with-legend">
<title>Revenue by industry</title>
<subtitle>2015</subtitle>
<tooltip point-format="<b>{point.percentage:.1f}%</b>">
</tooltip>
<plot-options>
<pie allow-point-select="true" show-in-legend="true"cursor="pointer">
<data-labels enabled="true"format="{point.name}: {point.y:.1f} M€"></data-labels>
</pie>
</plot-options>
<data-series name="Revenue" data="[[seriesData]]"></data-series>
</vaadin-pie-chart>
<my-data-source data="{{seriesData}}"></my-data-source>
</template>
<dom-module id="my-data-source">
<script>
Polymer({
is: "my-data-source",
properties: {
data: {
type: Array,
notify: true,
value: [
["Aerospace", 53.0],
["Medical", 53.6],
["Agriculture", 25.6],
["Automotive", 17.0],
["Consumers", 12.4],
["Subsidies", 1.4]]
}
}});
</script>
</dom-module>
</body>
</html>
Your code works perfectly in chrome, yet it fails on firefox
(console: Polymer not defined).
What you need to do is, wrap the polymer code in a check like:
addEventListener('WebComponentsReady', function() {
Polymer({
is: "my-data-source",
....
see working example here: https://jsbin.com/tifafepefi/edit?html,output
Having trouble getting my data to work across elements. Say I have an object "records" in my host element. It is usable in that element no problem. But when I try to spin off the view into a separate element, it no longer works.
Here's an example snippet of code. The .template part works fine but I'm not able to replicate the functionality in the child element .my-list. When I try, nothing happens.
<dom-module id="host-element">
...
<template is="dom-repeat" items="{{records}}">
<p>{{item.userName}} - {{item.number}}</p>
</template>
<my-list></my-list>
<script>
Polymer({
is: 'host-element',
ready: function() {
this.records = [
{userName: 'Bob'},
{userName: 'Sally'}
];
}
});
</script>
</dom-module>
If I try simply taking the current .template code and placing it into .my-list, it doesn't work.
I assume I need someway to bind the data into the child element, but I'm not able to figure this out. Adding a: record="{{records}}" to the tag, and then using that in the child element didn't work.
Imagine this is pretty simple, just can't find the answer in the documentation.
It's important that each element's top-level template is a plain template (not is="dom-repeat" or other specialization), otherwise, it should be straightforward:
<link rel="import" href="//polygit.org/components/polymer/polymer.html">
<i>(Requires Chrome)</i>
<host-element></host-element>
<dom-module id="my-list">
<template>
<template is="dom-repeat" items="{{records}}">
<p>{{item.userName}} - {{item.number}}</p>
</template>
</template>
<script>
Polymer({
is: 'my-list'
});
</script>
</dom-module>
<dom-module id="host-element">
<template>
<my-list records="{{records}}"></my-list>
</template>
<script>
Polymer({
is: 'host-element',
ready: function() {
this.records = [{userName: 'Bob'}, {userName: 'Sally'}];
}
});
</script>
</dom-module>
I've created a test polymer element where in I was figuring out how to use use arrays in templates. My code does not work and the documentation for 1.0 doesn't really talk much about how to use repeat in template tags.
my element:
<!-- Imports polymer -->
<link rel="import" href="polymer/polymer.html">
<!-- Defines element markup -->
<dom-module id="my-element" >
<template>
<style>
my-element
</style>
<h2>{{data}}</h2>
<ul>
<template repeat={{column in columns}} bind>
<li>{{column}}</li>
</template>
</ul>
</template>
</dom-module>
<!-- Registers custom element -->
<script>
Polymer({
is: 'my-element',
// Fires when an instance of the element is created
created: function() {
},
// Fires when the local DOM has been fully prepared
ready: function() {},
// Fires when the element was inserted into the document
attached: function() {},
// Fires when the element was removed from the document
detached: function() {},
// Fires when an attribute was added, removed, or updated
attributeChanged: function(name, type) {
alert("changed");
},
properties:{
data :String,
columns:Array
}
});
</script>
and the index.html page where I'm using the element:
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title><my-repo></title>
<!-- Imports polyfill -->
<script src="webcomponents-lite.min.js"></script>
<!-- Imports
custom element -->
<link rel="import" href="my-element.html">
<!-- Runs custom element -->
<my-element users = '{{[1,2,3,4]}}' data="This is a polymer table"></my-element>
Please let me know what's wrong with my code!!
You have to use
<template is="dom-repeat" items="{{users}}">
<li>{{item}}</li>
</template>
And in main file:
<my-element users="[1,2,3,4]" data="This is a polymer table"></my-element>
You can search Youtube for Polycast, a series by Google Developers where they're talking about Polymer for beginners and showing cool tricks.
Polymer 1.0 does not allow expressions in data binding. The problem is in:
<my-element users = '{{[1,2,3,4]}}' ...>
You need to replace {{[1,2,3,4]}} with a property. Something like this:
<template is="dom-bind">
<my-element users = '{{myarray}}' data="This is a polymer table"></my-element>
</template>
<script>
(function() {
var template = document.querySelector('template[is="dom-bind"]');
template.myarray = [1,2,3,4];
})();
</script>
We have a custom element that is making an AJAX call to fetch some html generated on the server side and then injected into its light dom via Polymer.dom(this).innerHTML. The response coming from the server has another custom element in it that exposes a CSS property for theming purposes. On the main page, we're setting the value for the property, but it doesn't appear to be working. How do we get Polymer to style dynamically added light DOM elements that are distributed by another element.
index.html
<style is="custom-style">
x-bar {
--mixin-property: {
background: red;
};
}
</style>
...
<body>
<x-baz>
</x-baz>
</body>
x-baz.html
<dom-module id="x-baz">
<template>
<x-foo></x-foo>
</template>
</dom-module>
<script>
Polymer({
is: "x-baz"
});
</script>
x-foo.html
<dom-module id="x-foo">
<template>
<iron-ajax auto url="..." last-response="{{response}}"></iron-ajax>
<content></content>
</template>
</dom-module>
<script>
Polymer({
is: "x-foo",
properties: {
response: {
type: String,
obeserver: 'responseChanged'
}
},
responseChanged: function(newVal)
Polymer.dom(this).innerHTML = newVal;
}
});
</script>
x-bar.html
<dom-module id="x-bar">
<style>
.elementToStyle {
#apply(--mixin-property);
}
</style>
<template>
<div class="elementToStyle">
...
</div>
</template>
</dom-module>
</script>
Polymer({
is: "x-bar"
});
</script>
The iron-ajax call returns <x-bar> ... </x-bar>.
I would expect the div inside the x-bar that comes back from the AJAX response to have a red background, but it doesn't seem to be working. What do we need to adjust to make this work correctly?
Thanks in advance!