I want to handle the click event of a marker on the map so I wanted to extend the google-map-marker. this is my-map-marker.html:
<link rel="import" href="../bower_components/google-map/google-map.html">
<polymer-element name="my-map-marker" extends="google-map-marker">
<script>
Polymer({
click: function() {
console.log("latitude:", this.latitude);
},
});
</script>
</polymer-element>
and I use it in another element as:
<paper-input value={{query}} label="Where?" floatingLabel></paper-input>
<google-map-search map="{{map}}" query="{{query}}" results="{{results}}"></google-map-search>
<google-map map="{{map}}" fitToMarkers>
<template repeat="{{results}}">
<my-map-marker latitude="{{latitude}}" longitude="{{longitude}}" clickEvents="true">
<h2>{{name}}</h2> {{formatted_address}}
</my-map-marker>
</template>
</google-map>
my code shows matching markers on map as i type location name if i use . but it gives this error code in developer console when I want to use :
Uncaught TypeError: Cannot read property 'setMap' of nullgoogle-map.html:197 Polymer.detachedpolymer.js:9961 base.detachedCallbackpolymer.js:7348 TemplateIterator.extractInstanceAtpolymer.js:7393 TemplateIterator.handleSplicespolymer.js:7301 TemplateIterator.valueChangedpolymer.js:7284 TemplateIterator.updateValuepolymer.js:7275 TemplateIterator.updateIteratedValuepolymer.js:4913 Observer.report_polymer.js:5180 createObject.check_polymer.js:4811 callback
How can I extend google-map-marker?
Based on Polymer documentation: "If you used extends to create a Polymer element that derives from an existing DOM element (something other than HTMLElement)", this syntax worked:
<google-map-marker is="my-map-marker" map="{{map}}" latitude="{{latitude}}" longitude="{{longitude}}">
<h2>{{name}}</h2> {{formatted_address}}
</google-map-marker>
Related
i am trying to use google map webcomponents and i am trying to add multiple markers to the lat, longs location i followed the question creating a google map with marker using web-component i tried adding multiple markers but the markers are not getting added
<link rel="import" href="../../bower_components/polymer/polymer.html">
<link rel="import" href="../../bower_components/google-apis/google-
apis.html">
<link rel="import" href="../../bower_components/google-map/google-
map.html">
<dom-module id="map-view">
<template>
<google-map map="{{map}}" disableDefaultUI fitToMarkers>
<template is="dom-repeat" items="{{marker}}">
<google-map-marker map={{map}} latitude="{{item.latitudine}}"
longitude="{{item.longitudine}}">
</google-map-marker>
</template>
</google-map>
</template>
<script>
Polymer({
is:'map-view',
properties:{
marker:{
type:Array
}
},
ready: function() {
this.marker = [
{latitudine: '41.223596', longitudine: '16.296087'},
{latitudine: '41.222450', longitudine: '16.291259'}
];
}
});
</script>
</dom-module>
and i am using map-view inside another div but i am not able to get multiple markers
can anybody show jsfiddle how to add multiple marker to googlemap webcomponents?
The above code works perfectly. You are viewing map of U.S.A. and your markers point to Italy. Zoom out and check in Europe.
If you want to change default view near your markers, you can set latitude and longitude in google-map element also. Like <google-map map="{{map}}" latitude="41.223596" longitude="16.296087" disableDefaultUI fitToMarkers>. I am using one of the position you provided. You can use nearest latitude and longitude.
I need to include a vaadin-grid in a custom Polymer 2 element and need to handle the row selection event, but I can't seem to get it to work. I've managed to cobble together this from the various starter templates and demos on offer, and the basic click event handler works, but I have no idea how to handle the row selection. I'm actually using v3.0.0-beta1 of the vaadin-grid because I couldn't get v2 to work, but I don't think that's my problem.
Does anyone know how to handle events in vaadin components when you include them in your own custom elements?
Thanks.
<link rel="import" href="bower_components/polymer/polymer-element.html">
<link rel="import" href="bower_components/iron-ajax/iron-ajax.html">
<link rel="import" href="bower_components/vaadin-grid/vaadin-grid.html">
<dom-module id="my-element">
<template>
<style>
:host {
display: block;
}
</style>
<iron-ajax auto url="https://demo.vaadin.com/demo-data/1.0/people?count=200" handle-as="json" last-response="{{users}}"></iron-ajax>
<vaadin-grid aria-label="My Test Grid" items="[[users.result]]" id="grid">
<vaadin-grid-column width="50px" flex-grow="0">
<template class="header">#</template>
<template>[[index]]</template>
</vaadin-grid-column>
<vaadin-grid-column>
<template class="header">First Name</template>
<template>[[item.firstName]]</template>
</vaadin-grid-column>
<vaadin-grid-column>
<template class="header">Last Name</template>
<template>[[item.lastName]]</template>
</vaadin-grid-column>
<vaadin-grid-column width="150px">
<template class="header">Address</template>
<template>
<p style="white-space: normal">[[item.address.street]], [[item.address.city]]</p>
</template>
</vaadin-grid-column>
</vaadin-grid>
</template>
<script>
class MyElement extends Polymer.Element {
static get is() { return 'my-element'; }
ready() {
super.ready();
this.$.grid.addEventListener('click', e => {
this._handleClick(e)
});
// I added this listener code from here: https://vaadin.com/elements/-/element/vaadin-grid#demos
// but it does nothing. I've also tried adding it to this, this.$, this.$.grid without success.
// Should this event listener be added here, or if not, where exactly? The docs are very unclear.
addEventListener('WebComponentsReady', function() {
Polymer({
is: 'my-element',
properties: {
activeItem: {
observer: '_activeItemChanged'
}
},
_activeItemChanged: function(item) {
this.$.grid.selectedItems = item ? [item] : [];
console.info('row clicked');
}
});
// this works and outputs info like this: "vaadin-grid-cell-content-17 was clicked."
_handleClick(e) {
console.info(e.target.id + ' was clicked.');
}
}
window.customElements.define(MyElement.is, MyElement);
</script>
</dom-module>
I think that my code in the addEventListener is Polymer 1.x syntax but I'm not sure how to achieve the same result using Polymer 2.x.
I used only vaadin-grid v2, but I downloaded the v3.0.0-beta1 and took a look inside the package, at demo/row-details.html
There is an example on how to handle the active row change event.
<vaadin-grid on-active-item-changed="_onActiveItemChanged" id="grid" aria-label="Expanded Items Example" data-provider="[[dataProvider]]" size="200">
<template class="row-details">
<div class="details">
<img src="[[item.picture.large]]"></img>
<p>Hi! My name is [[item.name.first]]!</p>
</div>
</template>
</vaadin-grid>
You can then define a function called _onActiveItemChanged inside your polymer element to handle the active item changed event.
I'm trying to observe added and removed dom nodes to my custom Polymer element without success. I've noticed that the this.$ is an empty object.
Polymer({
is: 'dramatic-view',
attached: function () {
this._observer = Polymer.dom(this.$.contentNode).observeNodes(function (info) {
console.log('kromid info', info);
});
}
});
The callback is being called only once (even tho I change content afterwards) with the following strange parameters:
I was following the docs here.
this.$ is a hash of elements in your template that have an id attribute (see Automatic node finding).
So, for this.$.contentNode to exist, you need an element with id="contentNode" in your <dom-module>'s <template>, and it must not be inside a dom-if or dom-repeat template:
<dom-module id="x-foo">
<template>
<content id="contentNode"></content>
</template>
</dom-module>
Nodes created dynamically (i.e., those inside dom-if or dom-repeat) must be queried with this.$$() (e.g., this.$$('#contentNode')). If you're trying to set them up in the attached callback, you'll need to wait until after the nodes are stamped, which could be observed with Polymer.RenderStatus.afterNextRender().
<dom-module id="x-foo">
<template>
<template is="dom-if" if="[[useDynamicContent]]">
<content id="contentNode"></content> <!-- unavailable to this.$ -->
</template>
</template>
<script>
Polymer({
is: 'x-foo',
attached: function() {
Polymer.RenderStatus.afterNextRender(this, function() {
var contentNode = this.$$('#contentNode');
if (contentNode) {
contentNode.observeNodes(...);
}
});
}
});
</script>
</dom-module>
To trigger the node observer, use Polymer's DOM API like this:
Polymer.dom(this).appendChild(node);
Polymer.dom(this).removeChild(node);
codepen
UPDATE It seems you're integrating Polymer with Elm, and expecting to see the observer callback for node-changes made my Elm. You'll need to hook Elm's calls to appendChild/removeChild somehow so that it uses Polymer's DOM API.
I'm learning Polymer. I have a view that is setup like this:
my-view.html
<dom-module id="my-view">
<template>
<template is="dom-if" if="[[ areAvailable ]]">
<my-component id="myComponent"></my-component>
<button type="button" on-click="onButtonClick">Test</button>
</template>
<template is="dom-if" if="[[ !areAvailable ]]">
<div>Move along</div>
<template>
</template>
<script>
Polymer({
is:'my-view',
properties: {
areAvailable: Boolean
},
onButtonClick: function() {
this.$.myComponent.test();
}
});
</script>
</dom-module>
This view shows my-component based on the areAvailable flag. If a user clicks the "Test" button, I need to execute a function in my-component. my-component is setup like this:
my-component.html
<dom-module id="my-component">
<template>
<h1>hello there!</h1>
</template>
<script>
Polymer({
is:'my-component',
test: function() {
alert('voila!');
}
});
</script>
</dom-module>
My challenge is, my approach works IF my-component is not inside of an "if" template. When my-component is inside of an "if" template, I get an error that says:
TypeError: Cannot read property 'test' of undefined
What am I doing wrong?
Note: Nodes created dynamically using data binding (including those in dom-repeat and dom-if templates) are not added to the this.$ hash. The hash includes only statically created local DOM nodes (that is, the nodes defined in the element’s outermost template).
Source: https://www.polymer-project.org/1.0/docs/devguide/local-dom.html#node-finding
Since you have already added a listener to the click event on your button, you can redefine that listener like this:
Polymer({
...
onButtonClick: function() {
// The this.root here refers to the local dom
// It is highly advised that you use Polymer.dom(<node>) when doing dom manipulations
Polymer.dom(this.root).querySelector('#myComponent').test();
}
});
Polymer have this simple function...
this.$$('#myComponent')
https://www.polymer-project.org/1.0/docs/devguide/local-dom#node-finding
I'm using polymer 1.2.1
I'm trying to create two polymer elements paper-button & paper-input.
I had imported following in head
<script src="third-party/js/bower/webcomponentsjs/webcomponents-lite.min.js"></script>
<link rel="import" href="third-party/html/bower/polymer/polymer.html">
<link rel="import" href="third-party/html/bower/paper-button/paper-button.html">
<link rel="import" href="third-party/html/bower/paper-input/paper-input.html">
and added following in body
<paper-button>Flat button</paper-button>
<paper-button raised>Raised button</paper-button>
<paper-button noink>No ripple effect</paper-button>
<paper-button toggles>Toggle-able button</paper-button>
<paper-input label="total">
<div prefix>$</div>
<paper-icon-button suffix icon="clear"></paper-icon-button>
</paper-input>
<script>
Polymer({
is: "paper-button",
// add a callback to the element's prototype
created: function() {
console.log("inside pol1");
this.textContent = "I'm a proto-element!"
}
});
Polymer({
is: "paper-input",
// add a callback to the element's prototype
created: function() {
console.log("inside pol2");
this.textContent = "I'm a proto-elemente2!"
}
});
</script>
I'm expecting a change in text of respective elements with some console but none of these happens. I get an error saying
"Uncaught NotSupportedError: Failed to execute 'registerElement' on 'Document': Registration failed for type 'paper-button'. A type with that name is already registered."
I'm not quite sure what you are trying to achieve, but the answer to your question is this:
Your paper-input and paper-button have already been registered into Polymer by your <link rel="import"> tags in your <head> section, so naturally when you try to re-register them using Polymer({is:"paper-button"...}), it fails...
I also wouldn't recommend overriding a packaged element's created() callback - if you want to do your own custom tasks, create a new custom element that wraps your target element, and then call your new element instead.