I am working on a login component and I want to ensure that the login status is accessible by other components within my application.
Is there anyone who can share some functional code snippets or examples?
I require a method for binding or event handling, so that whenever the login status changes, the interface of these connected components can be dynamically updated.
Establish a variable to depict the status in your login module and indicate notify: true.
Include data-binding within your login module as well as any other modules that rely on this status.
<login-module status="{{status}}"></login-module>
<other-module login="{{status}}"></other-module>
If you intend to utilize these modules outside of a Polymer template, take advantage of autobind by encapsulating them in a <template is="dom-bind">.
<template is="dom-bind">
<login-module status="{{status}}"></login-module>
<other-module login="{{status}}"></other-module>
</template>
If you want to implement local storage, you can utilize the <iron-localstorage> element by following the instructions provided here.
<dom-module id="ls-sample">
<iron-localstorage name="my-app-storage"
value="{{cartoon}}"
on-iron-localstorage-load-empty="initializeDefaultCartoon"
></iron-localstorage>
</dom-module>
<script>
Polymer({
is: 'ls-sample',
properties: {
cartoon: {
type: Object
}
},
// sets default values if nothing has been stored
initializeDefaultCartoon: function() {
this.cartoon = {
name: "Mickey",
hasEars: true
}
},
// update localstorage with changes using path set api
makeModifications: function() {
this.set('cartoon.name', "Minions");
this.set('cartoon.hasEars', false);
}
});
</script>
Take a look at this Plunker demo (created by @nazerke) illustrating how one component can observe another's property.
http://example.com/plunker-demo
index.html<!DOCTYPE html>
<html lang="en">
<head>
<script src="http://www.polymer-project.org/1.0/samples/components/webcomponentsjs/webcomponents-lite.min.js"></script>
<link rel="import" href="parent-element.html">
<link rel="import" href="first-child.html">
<link rel="import" href="second-child.html"> </head>
<body>
<parent-element></parent-element>
</body>
</html>
<link rel="import" href="http://www.polymer-project.org/1.0/samples/components/polymer/polymer.html">
<dom-module id="parent-element">
<template>
<first-child prop={{value}}></first-child>
<second-child feat1={{prop}}></second-child> In parent-element
<h1>{{value}}</h1> </template>
<script>
Polymer({
is: "parent-element",
properties: {
value: {
type: String
}
},
valueChanged: function() {
console.log("value changed");
}
});
</script>
</dom-module>
<link rel="import" href="http://www.polymer-project.org/1.0/samples/components/polymer/polymer.html">
<dom-module id="first-child">
<template>
<p>First child element.</p>
<h2>{{prop}}</h2> </template>
<script>
Polymer({
is: "first-child",
properties: {
prop: {
type: String,
notify: true
}
},
ready: function() {
this.prop = "property";
}
});
</script>
</dom-module>
<link rel="import" href="http://www.polymer-project.org/1.0/samples/components/polymer/polymer.html">
<dom-module id="second-child">
<template>
<p>Second child element.</p>
<h2>{{feat1}}</h2> </template>
<script>
Polymer({
is: "second-child",
properties: {
feat1: {
type: String,
notify: true,
value: "initial value"
}
},
ready: function() {
this.addEventListener("feat1-changed", this.myAct);
},
myAct: function() {
console.log("feat1-changed ", this.feat1);
}
});
</script>
</dom-module>
If you want to access metadata, consider using <iron-meta> which is explained in detail here:
<iron-meta key="info" value="foo/bar"></iron-meta>
...
meta.byKey('info').getAttribute('value').
Alternatively, you can also do:
document.createElement('iron-meta').byKey('info').getAttribute('value');
Another option is:
<template>
...
<iron-meta id="meta"></iron-meta>
...
this.$.meta.byKey('info').getAttribute('value');
....
</template>
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