Polymer: dom-repeat like local variable for elements - javascript

I'd like to create a control that converts the data into something I need.
At the moment, I solve this with a global variable. The code looks something like this:
(The lowercase functionality is only to demonstrate it in a simple way. Usually I want to use it for arrays of objects. e.g. to get distinct values of certain names and ids)
<dom-module id="my-tolower">
<script>
"use strict";
Polymer({
is: 'my-tolower',
properties: {
input: {
type: String,
value: "",
},
output:{
type: String,
value: "",
notify: true,
}
},
observers:[
"_inputChanged(input)",
],
_inputChanged: function(newInput, oldInput){
this.set("output", newInput.toLowerCase());
}
});
</script>
</dom-module>
Usage:
<my-tolower input="[[output.name]]" output="{{lower}}">[[lower]]</my-tolower>
This solution works great if I am only using the variable lower only once. Inside of a <dom-repeat>, I get a problem.
How can I easily make a custom variable that is only available inside of my-tolower? Exactly the same way as Polymer's dom-repeat does?
I took a look at the code at Polymer's <dom-repeat> sources, but I have no idea how that works. Is this even possible in a custom element? Do I need to create a custom template?
To explain my problem better I have added a bigger Example that explains my problem in detail.
HTMLImports.whenReady(() => {
Polymer({
is: 'my-app',
ready: function(){
//In my real Problem this value comes from a websocket...
this.devices = [{
name: "PC 1",
components: [
{
name: "HDD1",
processors: [
{
type: "Processor1",
usage: "Dont Know 1"
},
{ type: "Processor1", usage: "DontKnow2"},
{ type: "Processor2", usage: "DontKnow3"}
]
},
{
name: "Another Piece Of Hardware",
processors: [
{
type: "Processor4",
usage: "Dont Know 1"
},
{ type: "Processor3", usage: "DontKnow2"},
{ type: "Processor4", usage: "DontKnow3"}
]
}
]
},
{
name: "PC 2",
components: [
{
name: "My third piece of hardware",
processors: [
{
type: "Processor1",
usage: "Dont Know 1"
},
{ type: "Processor2", usage: "DontKnow2"},
{ type: "Processor3", usage: "DontKnow3"}
]
}
]
}];
//this.devices must not be changed!
}
});
Polymer({
is: 'my-distinct',
properties: {
inputs: {
type: String
},
outputs:{
computed: '_getDistincts(inputs, path)',
notify: true
},
path: {
type: String,
value: ""
}
},
_getDistincts(inputs, path){
let result = [];
for(let key in inputs){
if(inputs.hasOwnProperty(key)){
let x = inputs[key];
if(path && path != ""){
x = x[path];
}
if(result.indexOf(x) < 0){
result.push(x);
}
else{
//Already Exists
}
}
}
return result;
}
});
});
<head>
<base href="https://polygit.org/polymer+1.8.1/components/">
<script src="webcomponentsjs/webcomponents-lite.js"></script>
<link rel="import" href="polymer/polymer.html">
</head>
<body>
<my-app></my-app>
As you can see, there is always "Processor1", "Processor2" and "Pocessor3" available although this is only the result of the last computers component. You can see the right result (but with duplicates) if you use the comment I made instead.
<dom-module id="my-app">
<template>
<ul>
<template is="dom-repeat" items="[[devices]]" as="device">
<li>[[device.name]]
<ul>
<template is="dom-repeat" items="[[device.components]]" as="component">
<li>[[component.name]]
<ul>
<!-- This is my code with using distinct -->
<my-distinct inputs="[[component.processors]]"
outputs="{{distinctProcessorNames}}"
path="type">
<template is="dom-repeat" items="[[distinctProcessorNames]]" as="processorName">
<li>[[processorName]]
<!-- Here I could iterate over all processors (filtered) and list their usages-->
</li>
</template>
</my-distinct>
<!-- This is my code without using distinct. -->
<!--template is="dom-repeat" items="[[component.processors]]" as="processor">
<li>[[processor.type]]
<ul>
<li>Used for [[processor.usage]]</li>
</ul>
</li>
</template-->
</ul>
</li>
</template>
</ul>
</li>
</template>
</ul>
</template>
</dom-module>
</body>
Demo

You are using 2 different Polymer custom elements <my-app> and <my-distinct>.
Therefore you should declare the second one with its proper <dom-module> statement:
<dom-module id="my-distinct">
<template>
<template is="dom-repeat" items="[[outputs]]" as="processorName">
<li>[[processorName]]
</template>
</template>
</dom-module>
Then use your computed property (based on the attribute value) outputs as the items value of <template is="dom-repeat">.
Demo below:
HTMLImports.whenReady(() => {
Polymer({
is: 'my-app',
ready: function(){
//In my real Problem this value comes from a websocket...
this.devices = [{
name: "PC 1",
components: [
{
name: "HDD1",
processors: [
{
type: "Processor1",
usage: "Dont Know 1"
},
{ type: "Processor1", usage: "DontKnow2"},
{ type: "Processor2", usage: "DontKnow3"}
]
},
{
name: "Another Piece Of Hardware",
processors: [
{
type: "Processor4",
usage: "Dont Know 1"
},
{ type: "Processor3", usage: "DontKnow2"},
{ type: "Processor4", usage: "DontKnow3"}
]
}
]
},
{
name: "PC 2",
components: [
{
name: "My third piece of hardware",
processors: [
{
type: "Processor1",
usage: "Dont Know 1"
},
{ type: "Processor2", usage: "DontKnow2"},
{ type: "Processor3", usage: "DontKnow3"}
]
}
]
}];
//this.devices must not be changed!
}
});
Polymer({
is: 'my-distinct',
properties: {
inputs: {
type: String
},
outputs:{
computed: '_getDistincts(inputs, path)', notify: true
},
path: {
type: String,
value: ""
}
},
_getDistincts(inputs, path){
let result = [];
for(let key in inputs){
if(inputs.hasOwnProperty(key)){
let x = inputs[key];
if(path && path != ""){
x = x[path];
}
if(result.indexOf(x) < 0){
result.push(x);
}
}
}
//console.log( result )
return result;
}
});
});
<head>
<base href="https://polygit.org/polymer+1.8.1/components/">
<script src="webcomponentsjs/webcomponents-lite.js"></script>
<link rel="import" href="polymer/polymer.html">
</head>
<body>
<my-app></my-app>
<dom-module id="my-app">
<template>
<ul>
<template is="dom-repeat" items="[[devices]]" as="device">
<li>[[device.name]]
<ul>
<template is="dom-repeat" items="[[device.components]]" as="component">
<li>[[component.name]]
<ul>
<my-distinct inputs="[[component.processors]]" path="type">
</my-distinct>
</ul>
</li>
</template>
</ul>
</li>
</template>
</ul>
</template>
</dom-module>
<dom-module id="my-distinct">
<template>
<template is="dom-repeat" items="[[outputs]]" as="processorName">
<li>[[processorName]]
</template>
</template>
</dom-module>
</body>

As you discovered, properties declared inside a <dom-repeat> (i.e., lower in this case) are not scoped exclusively to the <dom-repeat> or its iterations. Thus, each iteration is overwriting the previous lower value, and lower remains available outside the <dom-repeat>.
However, you could achieve a similar scoping effect by attaching an output property to each item iterator in the <dom-repeat> if item is an Object.
For example, consider an <x-foo> element that takes an input array of Objects and passes each input to <my-tolower>, which writes a new value into _output (an attached property on the iterator):
<template is="dom-repeat" items="[[inputs]]" as="x">
<!-- Attach output to a new property on item (i.e., "_output") -->
<my-tolower input="[[x.input]]" output="{{x._output}}"></my-tolower>
</template>
HTMLImports.whenReady(() => {
Polymer({
is: 'x-foo',
properties: {
inputs: Array
},
_toObjArray: function(inputs) {
// Map inputs into objects so that we can attach properties to each iterator in a dom-repeat
return inputs.map(input => ({input}));
}
});
Polymer({
is: 'my-tolower',
properties: {
input: {
type: String,
value: "",
},
output: {
computed: '_computeOutput(input)',
notify: true,
}
},
_computeOutput: function(input) {
return input.toLowerCase();
}
});
});
<head>
<base href="https://polygit.org/polymer+1.8.1/components/">
<script src="webcomponentsjs/webcomponents-lite.js"></script>
<link rel="import" href="polymer/polymer.html">
</head>
<body>
<x-foo inputs='["aLPha", "brAVo", "CHarLiE", "DelTA", "epSiLoN"]'></x-foo>
<dom-module id="x-foo">
<template>
<template is="dom-repeat" items="[[_toObjArray(inputs)]]">
<!-- Attach output to a new property on item (i.e., "_output") -->
<my-tolower input="[[item.input]]" output="{{item._output}}"></my-tolower>
<div>
<span>[[item.input]] -> [[item._output]]</span>
</div>
</template>
</template>
</dom-module>
</body>
demo
In your code, you have a nested object, used in nested dom-repeats. The same technique from above can be applied at each nesting level, but your example only needs it at the innermost level. You could give <my-distinct>.outputs its own "local" variable by attaching the output to the iterator (i.e., component):
<my-distinct outputs="{{component.distinctProcessorNames}}" ...>
Then, you'd use that in your inner dom-repeat like this:
<template is="dom-repeat" items="[[component.distinctProcessorNames]]" ...>
HTMLImports.whenReady(() => {
Polymer({
is: 'my-app',
ready: function(){
this.devices = [{
name: "PC 1",
components: [
{
name: "HDD1",
processors: [
{
type: "Processor1",
usage: "Dont Know 1"
},
{ type: "Processor1", usage: "DontKnow2"},
{ type: "Processor2", usage: "DontKnow3"}
]
},
{
name: "Another Piece Of Hardware",
processors: [
{
type: "Processor4",
usage: "Dont Know 1"
},
{ type: "Processor3", usage: "DontKnow2"},
{ type: "Processor4", usage: "DontKnow3"}
]
}
]
},
{
name: "PC 2",
components: [
{
name: "My third piece of hardware",
processors: [
{
type: "Processor1",
usage: "Dont Know 1"
},
{ type: "Processor2", usage: "DontKnow2"},
{ type: "Processor3", usage: "DontKnow3"}
]
}
]
}];
}
});
Polymer({
is: 'my-distinct',
properties: {
inputs: {
type: String
},
outputs:{
computed: '_getDistincts(inputs, path)',
notify: true
},
path: {
type: String,
value: ""
}
},
_getDistincts(inputs, path){
let result = [];
for(let key in inputs){
if(inputs.hasOwnProperty(key)){
let x = inputs[key];
if(path && path != ""){
x = x[path];
}
if(result.indexOf(x) < 0){
result.push(x);
}
else {
//Already Exists
}
}
}
return result;
}
});
});
<head>
<base href="https://polygit.org/polymer+1.8.1/components/">
<script src="webcomponentsjs/webcomponents-lite.js"></script>
<link rel="import" href="polymer/polymer.html">
</head>
<body>
<my-app></my-app>
<dom-module id="my-app">
<template>
<ul>
<template is="dom-repeat" items="[[devices]]" as="device">
<li>[[device.name]]
<ul>
<template is="dom-repeat" items="[[device.components]]" as="component">
<li>[[component.name]]
<ul>
<my-distinct inputs="[[component.processors]]" outputs="{{component.distinctProcessorNames}}" path="type">
</my-distinct>
<template is="dom-repeat" items="[[component.distinctProcessorNames]]" as="processorName">
<li>[[processorName]]</li>
</template>
</ul>
</li>
</template>
</ul>
</li>
</template>
</ul>
</template>
</dom-module>
</body>
your demo with updates
You commented that you don't want to clone any objects or modify the input. That's unfortunately not possible with the iterator-property technique described above. The better option in that case is to provide a template for <my-distinct>, which would encapsulate any transformations without affecting the input.

Related

How to iterate array value by comparing it with another array in Vuejs?

HelloWorld.vue
<template>
<div>
<div v-for="box in boxes" :key="box.sname">
<BaseAccordian>
<template v-slot:title>{{ box.sname }}</template>
<template v-slot:content>
<div v-for="paint in paints" :key="paint.tname" class="line">
<List :content="matchingdata" :sname="box.sname" />
</div>
</template>
</BaseAccordian>
</div>
</div>
</template>
<script>
import BaseAccordian from "./BaseAccordian.vue";
import List from "./List.vue";
export default {
name: "HelloWorld",
components: {
BaseAccordian,
List,
},
data() {
return {
boxes: [
{
sname: "apple",
},
{
sname: "bananna",
},
{
sname: "grapes",
},
{
sname: "choc",
},
],
paints: [
{
tname: "a",
},
{
tname: "b",
},
{
tname: "c",
},
{
tname: "d",
},
{
tname: "e",
},
],
matchingdata: [
{
matchid: "1",
OverallStatus: "ok",
sname: "choc",
},
{
matchid: "2",
OverallStatus: "notok",
sname: "grapes",
},
],
};
},
};
</script>
BaseAccordion.vue
<template>
<div class="wrapper">
<div class="accordion">
<input type="checkbox" #click="toggleItem" />
<h2 class="title">
<slot name="title"></slot>
</h2>
</div>
<div v-show="show" class="content">
<slot name="content"></slot>
</div>
</div>
</template>
<script>
export default {
components: {},
data: function () {
return {
show: false,
};
},
methods: {
toggleItem: function () {
this.show = !this.show;
},
},
};
</script>
List.vue
<template>
<div class="">
<div
v-for="match in matchingData"
:key="match.matchid"
:class="{
green: match.OverallStatus === 'ok',
red: match.OverallStatus === 'notok',
}"
>
{{ match.OverallStatus }}
</div>
</div>
</template>
<script>
export default {
components: {},
props: {
content: {
type: Array,
required: true,
},
sname: {
type: String,
required: true,
},
},
data: function () {
return {};
},
methods: {},
computed: {
matchingData() {
return this.content.filter((a) => {
if (a.sname === this.sname) {
return true;
} else {
return false;
}
});
},
},
};
</script>
<style scoped>
</style>
I three arrays called matchingdata,boxes,paints array based on this three arrays, i am trying to filter the array.(nested v-for)
Now, I want to iterate the matchingdata array by comparing it with sname in boxes array. and Common value between matchingdata and boxes array is ""sname""
I tried above logic, and struck with computed property.
Expected Output:-
In List.vue component , i have
{{ match.OverallStatus }} where that field , i want to show,(from the matchingdata array) when user clicked on checkbox.
Taking the ""sname"" the common value from the matchingdata array and the boxes array
code:- https://codesandbox.io/s/damp-pine-27s2kn?file=/src/components/List.vue
As you're passing the sname property as a string via a prop to your List.vue component, you'll just need to use that string in your filter function.
matchingData() {
return this.content.filter((a) => a.sname === this.sname)
},
I've tried this in your codesandbox link and it is giving some output - but I'm not clear enough on what you're trying to achieve to know if this is the intended outcome.
Just incase you're not aware the 'filter' function returns a new array. It's not going to return a 'true/false' which I feel you may be trying to do.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/filter

Polymer1 1.x Behaviour Not Found

I've been learning Polymer since 3 days ago and I'm stucked with Polymer Behaviours.
I've defined a Behaviour as you can see in the following code:
<script>
BSM._TestBehaviour = {
properties: {
language: {
value: document.documentElement.lang
},
/*GetCountries: {
type: Function,
computed: '_computeCountries'
},*/
fcountries: function () {
return function(){
return ['Catalunya','Andorra'];
}.bind(this);
}
}
};
BSM.TestBehaviour = [BSM._TestBehaviour];
</script>
And in the following snippet it can be seen a component that uses that behaviour:
<link rel="import" href="test-behaviour.html">
<dom-module id="test-apps">
<style>
</style>
<template>
<div id="container">
<paper-input value="{{_defaultUser.FirstName}}"></paper-input>
<paper-input value="{{_defaultUser.LastName}}"></paper-input>
<div></div>
<paper-dropdown-menu class="p50" label="Countries" >
<paper-listbox class="dropdown-content" id="countries">
<template is="dom-repeat" items="{{fcountries()}}">
<paper-item name="[[item]]">[[item]]</paper-item>
</template>
</paper-listbox>
</paper-dropdown-menu>
<div></div>
</div>
<iron-data-table id="idt" items="{{GetCountries}}" selection-enabled multi-selection>
<data-table-column name="Id" >
<template> {{item.Id}}</template>
</data-table-column>
<data-table-column name="FirstName" >
<template> {{item.FirstName}}</template>
</data-table-column>
<data-table-column name="LastName" >
<template> {{item.LastName}}</template>
</data-table-column>
<data-table-column name="FullName" >
<template> [[_computeFullName(item)]]</template>
</data-table-column>
<data-table-column name="Country" >
<template> [[item.Country]]</template>
</data-table-column>
</iron-data-table>
</template>
<script>
BSM.TestApps = Polymer({
is: 'test-apps',
behaviours: [BSM.TestBehaviour],
properties: {
items: {
type: Array,
value: function () { return []; }
},
_defaultUser: {
type: Object
},
defaultSelected: {
type: Object
},
selectedIdCountry: {
type: Number
},
_newItemlabel: {
type: String
},
_itemsselected:{
type: Array,
value: function () {return [];}
},
countries:{
type: Array,
notify: true,
//value: function() {return ["Alemanya", "Dinamarca", "Canada"];}
//value: MyBehaviors.TestBehaviour.GetCountries
}
},
ready: function () {
var countries = this.behaviours[0].properties.GetCountries;
var users = [
{Id:1, FirstName: "Aleix", LastName: "Trasserra", Country: "EEUU"},
{Id:2, FirstName: "Maria", LastName: "Garcia", Country: "EEUU"},
{Id:3, FirstName: "Anna", LastName: "Tous", Country: "EEUU"},
{Id:4, FirstName: "Manel", LastName: "Rodriguez", Country: "EEUU"},
];
this.items = users;
var defaultUser = {
Id: null,
FirstName:"",
LastName: "",
Country:null
};
this._defaultUser = defaultUser;
this.$.idt.addEventListener('selecting-item',this._selectedItem.bind(this));
},
_selectedItem: function (e) {
this.set('_itemsselected', this.$.idt.selectedItems);
},
_onAddItem: function () {
//this.push('items',{Id: 4, text: this._newItemlabel});
//this.set('_newItemlabel',"");
},
_onRemoveSeletedItems: function () {
this._itemsselected.forEach(e => {
var index = this.items.indexOf(e);
this.splice('items',index,1);
})
},
_computeFullName: function (item) {
return item.FirstName + " " + item.LastName;
}
})
</script>
</dom-module>
The problem is that the component does not found the function "fcountries" defined in the behaviour.
Anyone can help me with this issue?
Thanks a lot!
Behavior:
/* #polymerBehavior BSM.TestBehaviourImp */
BSM.TestBehaviourImp = {
// implementation here
};
/* #polymerBehavior BSM.TestBehaviour */
BSM.TestBehaviour = [
BSM.TestBehaviourImp
// , other included base behaviors
];
Element:
...
<iron-data-table id="idt" items="{{items}}" selection-enabled multi-selection>
...
The table lists the users, which are stored in property items.
It looks like you want do do something with countries (like showing a filtered table of users)?
In that case, bind the selected item of <paper-dropdown-menu> to a property, i.e. selectedCountry: {type: String}.
Add a function which returns an Array of users, filtered to the selected country:
usersInSelectedCountry(): {
return this.items.filter(user => user.Country === this.selectedCountry || this.selectedCountry == null);
}
and use that function's return value as the data set for the table.

How to get a particular object from an array of object and push it to an another array

I want to display checktext on paper-dialog with only vehiclename from checkarray and on console i want to display checktext with all the objects from checkarray. Currently, on paper-dialog only Truck value comes on clicking any papaer-checkbox
<template is="dom-repeat" items="{{checkdata}}">
<paper-checkbox on-tap="checkall" checked="{{item.checked}}">{{item.name}}</paper-checkbox>
</template>
Property:
checkdata: {
type: Array,
value: [{
name: 'Bike',
no: 1,
}, {
name: 'Car',
no: 2,
}, {
name: 'Cycle',
no: 3,
}, {
name: 'Bus',
no: 4,
}, {
name: 'Truck',
no: 5,
}],
}
Javascript:
checkall: function() {
var checkvalue = this.checkdata;
var checktext = [];
for (i = 0; i < checkvalue.length; i++) {
var checkarray = {
vehiclename: checkvalue[i].name,
vehiclenumber: checkvalue[i].no,
};
if (checkvalue[i].checked == true) {
checktext.push(checkarray);
}
}
this.checkeditem = checkarray.vehiclename;
console.log(checktext);
}
I have replied this question pre stage before. Now I could not understand exactly what you really want to do more, hope this will help!
<html>
<head>
<base href="https://polygit.org/polymer+:master/components/">
<link href="polymer/polymer.html" rel="import">
<link rel="import" href="paper-checkbox/paper-checkbox.html">
<link rel="import" href="paper-button/paper-button.html">
<link rel="import" href="paper-progress/paper-progress.html">
<link rel="import" href="paper-dialog/paper-dialog.html">
<script src="webcomponentsjs/webcomponents-lite.js"></script>
</head>
<body>
<my-test>test</my-test>
<dom-module id="my-test">
<template>
<style>
:host {
display: block;
height: 100%;
}
</style>
<div>
<template is="dom-repeat" items="{{checkdata}}">
<paper-checkbox checked="{{item.checked}}" on-change='checkedChenged'></paper-checkbox>
<span>{{item.name}}</span> <br/> <br/>
</template>
<paper-dialog id="dialog">
<h2>Selected Vehicle: {{vehicle}}</h2>
<div class="buttons">
<paper-button dialog-confirm autofocus on-tap='uncheckAll'>Tap me to close</paper-button>
</div>
</paper-dialog>
<paper-button on-tap="checkAll" raised>Check All</paper-button>
<paper-button on-tap="uncheckAll" raised>Uncheck All</paper-button>
<paper-button on-tap="togglecheckAll" raised> Toggle Check/Uncheck</paper-button>
</div>
</template>
<script>
HTMLImports.whenReady(function() {
class MyTest extends Polymer.Element {
static get is() { return 'my-test'; }
static get properties() { return {
vehicle:String,
checkdata:{
type: Array,
value() {return [{name: 'Bike'}, {name: 'Car'}, {name: 'Cycle'}, {name: 'Bus'}, {name: 'Truck'}
]}
}
}}
static get observers() {return [
'checkCheckdata(checkdata)']}
// set this element's employees property
constructor() {
super();
}
checkCheckdata(d){
// console.log('data : ',d)
}
checkAll() {
let checkdata=[];
this.checkdata.forEach((i,x)=> {
checkdata.push({"name": i.name, "checked": true});
if (x==this.checkdata.length-1){
this.set('checkdata', checkdata);
}
})
}
uncheckAll() {
let checkdata=[];
this.checkdata.forEach((i,x)=> {
checkdata.push({"name": i.name, "checked": false});
if (x==this.checkdata.length-1){
this.set('checkdata', checkdata);
}
})
}
togglecheckAll() {
let checkdata=[];
this.checkdata.forEach((i,x)=> {
checkdata.push({"name": i.name, "checked": !i.checked});
if (x==this.checkdata.length-1){
this.set('checkdata', checkdata);
}
})
}
checkedChenged(i) {
this.vehicle= i.model.item.name;
this.$.dialog.open();
}
}
customElements.define(MyTest.is, MyTest);
});
</script>
</dom-module>
</body>
</html>
DEMO (at Codepen)

Bind iron-ajax response into nested element's property

I have the same problem as this question: "Polymer How to pass returned iron-ajax string into another polymer element", but the answer didn't solve my problem.
I have two custom elements (below), and I want to bind the response from <iron-ajax> into a property (pagination_options) of a-pagination. In a-pagination, if I check the property value using console.log, pagination_options is always logged as undefined. Another property I'm binding (url) is always populated. Why is pagination_options undefined?
table-list element :
<dom-module id="table-list">
<link rel="stylesheet" href="table-list.css" />
<template>
<iron-ajax url=[[url]] last-response={{response}} params=[[params]] auto></iron-ajax>
<template is="dom-repeat" items="{{response.data}}" as="item">
<div>[[item.content]]</div>
</template>
<a-pagination url=[[url]] pagination_options={{response.pagination}}></a-pagination>
</template>
<script>
Polymer({
is: "table-list",
properties: {
url: String,
params: Object
}
});
</script>
</dom-module>
a-pagination element :
<dom-module id="a-pagination">
<script>
Polymer({
is: "a-pagination",
properties: {
url: String,
pagination_options: Object
},
ready: function(){
console.log(this.url);
console.log(this.pagination_options);
}
});
</script>
</dom-module>
Usage:
<table-list url="http://localhost/api/v1/article" params='{"page": 1}'></table-list>
Example AJAX response:
{
"status": "success",
"data": [{
"id": "1",
"content": "content 1"
},
{
"id": "2",
"content": "content 2"
}],
"pagination": {
"total_page": 1,
"per_page": 10,
"current_page": "1"
}
}
In this case, the ready lifecycle event always occurs before the AJAX response event, so when you log the property in ready(), you're actually logging the initial value of pagination_options (which is undefined).
Instead, you should use an observer like this:
Polymer({
is: 'a-pagination',
observers: ['_paginationChanged(pagination_options)'],
_paginationChanged: function(pagination_options) {
console.log(pagination_options);
},
//...
});
HTMLImports.whenReady(() => {
Polymer({
is: "table-list",
properties: {
url: String,
params: Object
},
ready() {
// fill response asynchronously to simulate AJAX event
this.async(() => {
this.response = {
"status": "success",
"data": [{
"id": "1",
"content": "content 1"
}, {
"id": "2",
"content": "content 2"
}],
"pagination": {
"total_page": 1,
"per_page": 10,
"current_page": "1"
}
};
}, 1000);
}
});
Polymer({
is: "a-pagination",
properties: {
url: String,
pagination_options: Object
},
observers: [
'_paginationChanged(pagination_options)'
],
ready() {
// Don't log `pagination_options` in the `ready`
// callback, since the AJAX request that fills
// it might not yet have occurred, and the
// resulting data bindings might not yet have
// taken effect. Use observers instead.
console.log('ready(): url', this.url);
console.log('ready(): pagination_options', this.pagination_options);
},
_paginationChanged(pagination_options) {
console.log('_paginationChanged(): pagination_options', pagination_options);
}
});
});
<head>
<base href="https://polygit.org/polymer+1.7.1/components/">
<script src="webcomponentsjs/webcomponents-lite.min.js"></script>
<link rel="import" href="polymer/polymer.html">
</head>
<body>
<div>See console log</div>
<table-list url="http://httpbin.org/get"></table-list>
<dom-module id="table-list">
<link rel="stylesheet" href="table-list.css" />
<template>
<iron-ajax url=[[url]] last-response={{response}} params=[[params]]></iron-ajax>
<template is="dom-repeat" items="{{response.data}}" as="item">
<div>[[item.content]]</div>
</template>
<a-pagination url=[[url]]
pagination_options={{response.pagination}}></a-pagination>
</template>
</dom-module>
</body>
codepen

Polymer dynamic disable inside dom-repeat

I want to set paper-item as disabled or active according to variants variable. I used dom-repeat to list paper-items. disabled property can be used for this, however it cannot set like these: disabled="true" or disabled="false".
How can I do this?
<paper-listbox attr-for-selected="itemID" selected="{{item.id}}" class="dropdown-content">
<template is="dom-repeat" items="[[variants]]">
<paper-item itemID$="[[item.id]]">[[item.value]]</paper-item>
</template>
</paper-listbox>
Polymer({
is: 'item-create',
properties: {
variants: {
type: Array,
value: [
{id: 1, value: "Color", status: "disabled"},
{id: 2, value: "Number", status: "active"}
]
}
}
});
You could use a computed binding that returns true only when status is disabled:
// template
<paper-item disabled="[[_computeDisabled(item.status)]]">
// script
_computeDisabled: function(status) {
return status === 'disabled';
}
HTMLImports.whenReady(() => {
Polymer({
is: 'x-foo',
properties: {
variants: {
type: Array,
value: () => [{
id: 1,
value: "Color",
status: "disabled"
}, {
id: 2,
value: "Number",
status: "active"
}]
}
},
_computeDisabled: function(status) {
return status === 'disabled';
}
});
});
<head>
<base href="https://polygit.org/polymer+1.11.3/webcomponents+webcomponents+:v0/components/">
<script src="webcomponentsjs/webcomponents-lite.js"></script>
<link rel="import" href="paper-dropdown-menu/paper-dropdown-menu.html">
<link rel="import" href="paper-listbox/paper-listbox.html">
<link rel="import" href="paper-item/paper-item.html">
<link rel="import" href="neon-animation/web-animations.html">
</head>
<body>
<x-foo></x-foo>
<dom-module id="x-foo">
<template>
<paper-dropdown-menu>
<paper-listbox attr-for-selected="item-id" selected="{{item.id}}" slot="dropdown-content">
<template is="dom-repeat" items="[[variants]]">
<paper-item item-id="[[item.id]]" disabled="[[_computeDisabled(item.status)]]">[[item.value]]</paper-item>
</template>
</paper-listbox>
</paper-dropdown-menu>
</template>
</dom-module>
</body>
codepen

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