I have a firebase structure like this:
"workouts" : {
"-KBJiXAHZV2B8sj9-FNk" : {
"exercise_templates" : {
"-KEsVT-ukSHMNevLFCa1" : true,
"-KEslP747OVTdIYrNmCv" : true,
"-KEslUBaSsmTOiVgV_h_" : true,
"-KFpJyXrZwY_aPiDGGvw" : true
},
"name" : "ICF A"
}
}
"exercise_templates" : {
"-KEsVT-ukSHMNevLFCa1" : {
"name" : "Overhead Press",
"reps" : "5",
"sets" : "5",
"workouts" : {
"-KBJiXAHZV2B8sj9-FNk" : true,
"-KEsU4Q0irvgh33I20JF" : true
}
},
I'm trying to loop through all exercise_templates that belong to a workout:
<template is="dom-repeat" items="[[workouts]]" as="workout">
<paper-card heading="[[workout.name]]">
<div class="card-content">
[[workout.__firebaseKey__]]
<template is="dom-repeat" items="[[workout.exercise_templates]]" as="template" handle-as="json">
{{template}}
</template>
</div>
<div class="card-actions">
<paper-button>Some action</paper-button>
</div>
</paper-card>
</template>
But I get:
[dom-repeat::dom-repeat]: expected array for `items`, found Object {-KEsVT-ukSHMNevLFCa1: true, -KEslP747OVTdIYrNmCv: true, -KEslUBaSsmTOiVgV_h_: true, -KFpJyXrZwY_aPiDGGvw: true}
How would I go about referencing an exercise_template by iterating through the exercise_templates in workouts?
Custom element
<dom-module id="my-workout">
<template>
<template is="dom-bind">
<style>
:host {
display: block;
}
span {
#apply(--paper-font-body1);
}
</style>
<firebase-collection
limit-to-first="10"
location="https://blazing-inferno-5257.firebaseio.com/workouts"
data="{{workouts}}" keys="{{keys}}"></firebase-collection>
<template is="dom-repeat" items="[[workouts]]" as="workout">
<paper-card heading="[[workout.name]]">
<div class="card-content">
<template is="dom-repeat" items="[[_computeExerciseTemplates(workout)]]">
<li>{{item}}</li>
</template>
</div>
<div class="card-actions">
<paper-button>Do workout</paper-button>
</div>
</paper-card>
</template>
</template>
</template>
<script>
(function() {
'use strict';
Polymer({
is: 'my-workout',
_computeExerciseTemplates: function(workout) {
return Object.keys(workout.exercise_templates);
},
ready: function() {
}
});
})();
</script>
</dom-module>
Assuming exercise_templates cannot be changed into a simple array (or that it's undesirable), you could use a computed binding for exercise_templates to get its keys:
<template is="dom-repeat" items="[[_computeExerciseTemplates(workout)]]">
<li>{{item}}</li>
</template>
where _computeExerciseTemplates is defined as:
<script>
Polymer({
...
_computeExerciseTemplates: function(workout) {
return Object.keys(workout.exercise_templates);
}
});
</script>
<head>
<base href="https://polygit.org/polymer+:master/components/">
<script src="webcomponentsjs/webcomponents-lite.min.js"></script>
<link rel="import" href="polymer/polymer.html">
</head>
<body>
<x-foo></x-foo>
<dom-module id="x-foo">
<template>
<template is="dom-repeat" items="[[workouts]]" as="workout">
<h2>{{workout.name}}</h2>
<ul>
<template is="dom-repeat" items="[[_computeExerciseTemplates(workout)]]">
<li>{{item}}</li>
</template>
</ul>
</template>
</template>
<script>
Polymer({
is: 'x-foo',
properties: {
workouts: {
type: Array,
value: function() {
return [{
//"-KBJiXAHZV2B8sj9-FNk" : {
"exercise_templates": {
"-KEsVT-ukSHMNevLFCa1": true,
"-KEslP747OVTdIYrNmCv": true,
"-KEslUBaSsmTOiVgV_h_": true,
"-KFpJyXrZwY_aPiDGGvw": true
},
"name": "ICF A"
//}
}]
}
}
},
_computeExerciseTemplates: function(workout) {
return Object.keys(workout.exercise_templates);
}
});
</script>
</dom-module>
</body>
jsbin
Related
First project with Vue3, trying to determine if a named slot has content supplied on a given page.
In my template I have this:
<div
:class="{ 'py-20': hasTopContent }"
>
<slot name="top-content" />
</div>
In my code I have the following:
setup (_, { slots }) {
const hasTopContent = computed((slots) => {
console.log(slots.topContent);
return slots.topContent && slots.topContent().length;
});
return {
hasTopContent
}
}
The above console.log is returning TypeError: Cannot read properties of undefined (reading 'topContent'). What have I missed? Thanks!
Michal Levý is right
var Main = {
components: {
'my-component': MyComponent,
},
data() {
return {
}
},
methods: {
}
};
const app = Vue.createApp(Main);
app.mount("#app")
<html>
<head>
<style>
.my-component {
background-color: #fafafa;
padding: 5px 20px 20px 20px;
}
</style>
</head>
<body>
<div id="app">
<h3>With top slot</h3>
<my-component class='my-component'>
<template v-slot:top>
<h4>Top Slot</h4>
</template>
</my-component>
<h3>Without top slot</h3>
<my-component class='my-component'>
</my-component>
<hr style='padding: 20px 20px 20px 20px;' />
</div>
<script src="//unpkg.com/vue#next"></script>
<script type="text/x-template" id="my-component">
<div
:class="{ 'py-20': hasTopContent }">
<slot name="top" />
hasTopContent: {{hasTopContent}}
</div>
</script>
<script type="text/javascript">
var MyComponent = {
template: '#my-component',
setup(_, { slots }) {
const hasTopContent = Vue.computed(() => {
return slots.top && slots.top().length > 0;
});
return { hasTopContent }
}
}
</script>
</body>
</html>
I'm new to Nuxt and Vue, thanks for being indulgent ;).
I have a "Subtitle" component that I use in another "Main" component (names are for the example).
How can I change the css of the "subtitle" component from the "Main" component ?
Here "Subtitle" component :
<template>
<div>
<h1 :class="data">{{ title }}</h1>
</div>
</template>
<script>
export default {
name: 'subtitle',
props: {
title: String,
}
}
</script>
And here my "Main" component :
<template>
<div class="container">
<Subtitle :title="title""></Subtitle>
</div>
</template>
I searched with the props etc.... But now I've been on it for a while and I'm blocking.
Thanks for your help!
You can do it using the combination of props and computed
Subtitle Component
<template>
<div>
<h1 :style="getStyle">{{ title }}</h1>
</div>
</template>
<script>
export default {
name: 'subtitle',
props: {
stylings: Object,
},
computed: {
getStyle() {
return this.stylings;
}
}
}
</script>
Main Component
<template>
<div class="container">
<Subtitle :stylings="customStyle"></Subtitle>
</div>
</template>
export default {
name: 'subtitle',
data() {
return {
customStyle: {
'font-weight': 'Bold',
}
}
}
I am trying to pass a parameter to a function by looping through an the array items with v-for.
<template>
<v-app>
<v-app-bar app>
<v-app-bar-nav-icon #click="drawer = !drawer"></v-app-bar-nav-icon>
<v-spacer></v-spacer>
<h1 ref="y"></h1>
</v-app-bar>
<v-content>
<router-view />
<v-navigation-drawer v-model="drawer" class="x">
<v-list-item
v-for="item in items"
:key="item.unidade"
:to="item.link"
:#click="change(item.method)"
>{{item.unidade}}</v-list-item>
</v-navigation-drawer>
</v-content>
</v-app>
</template>
<script>
export default {
name: "App",
data: () => ({
items: [
{ unidade: "IPE", link: "/ipe", method: "IPE" },
{ unidade: "DCSI", link: "/dcsi", method: "DCSI" },
{ unidade: "RT", link: "/rt", method: "RT" }
],
drawer: false
}),
methods: {
change(val) {
console.log(val);
this.$refs.y.innerText = val;
}
}
};
</script>
<style lang="stylus" scoped>
.x {
position: absolute;
}
</style>
I want the parameter in items arrray to be passed to change(val) method giving each v-list-item a distinct event listener.
Then I want h1 with the ref="y" to change it's text based on the v-list-item I click. But so far I am getting the browser error of "Error in render: "TypeError: Cannot set property 'innerText' of undefined""
Instead of setting the innerText of the <h1> you could instead bind the innerText to a reactive variable. You could create a variable in data that could store the selected method and then bind that to the innerText using {{}} syntax. Doing it this way would be more inline with Vue best practices. Let me show you what I mean.
<template>
<v-app>
<v-app-bar app>
<v-app-bar-nav-icon #click="drawer = !drawer"></v-app-bar-nav-icon>
<v-spacer></v-spacer>
<h1 ref="y">{{ selectedMethod }}</h1>
</v-app-bar>
<v-content>
<router-view />
<v-navigation-drawer v-model="drawer" class="x">
<v-list-item
v-for="item in items"
:key="item.unidade"
:to="item.link"
:#click="change(item.method)"
>{{item.unidade}}</v-list-item>
</v-navigation-drawer>
</v-content>
</v-app>
</template>
<script>
export default {
name: "App",
data: () => ({
items: [
{ unidade: "IPE", link: "/ipe", method: "IPE" },
{ unidade: "DCSI", link: "/dcsi", method: "DCSI" },
{ unidade: "RT", link: "/rt", method: "RT" }
],
selectedMethod: '', // Initially blank
drawer: false
}),
methods: {
change(val) {
this.selectedMethod = val; // Update the value of selectedMethod
}
}
};
</script>
<style lang="stylus" scoped>
.x {
position: absolute;
}
</style>
Hope this helps!
I want to make an editor of files. By the following code (JSBin), we list all the file names on the left hand, and their body on the right hand. I use ui-codemirror to style the body of the files.
However, when we click on the file names and switch from one to another, from time to time, we could see the quick flick from a textarea to a codemirror frame, which is not a good experience for an editor.
Does anyone have a solution to avoid the flick? Addtionally, is it a good direction to make an editor by angularJS and ui-codemirror?
<html ng-app="flapperNews">
<head>
<link rel="stylesheet" href="https://codemirror.net/lib/codemirror.css">
<script src="https://code.jquery.com/jquery.min.js"></script>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" rel="stylesheet" type="text/css" />
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.5.7/angular.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/angular-ui-router/0.3.2/angular-ui-router.js"></script>
<script src="https://codemirror.net/lib/codemirror.js"></script>
<script src="https://codemirror.net/mode/xml/xml.js"></script>
<script src="https://codemirror.net/mode/htmlmixed/htmlmixed.js"></script>
<script src="https://codemirror.net/mode/javascript/javascript.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/angular-ui/0.4.0/angular-ui.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/angular-ui-bootstrap/0.11.0/ui-bootstrap-tpls.js"></script>
<script>
var app = angular.module('flapperNews', ['ui', 'ui.router']);
app.config(['$stateProvider', function ($stateProvider) {
$stateProvider
.state('file', {
template: '<textarea ui-codemirror="editorOptionsHTML" ng-model="file.body"></textarea>',
controller: 'FileCtrl',
params: { name: null }
})
}]);
app.controller('MainCtrl', ['$scope', '$state', function ($scope, $state) {
$scope.files = [
{ name: "index.html", body: "<html><body>index.html</body></html>" },
{ name: "index.js", body: "the body of index.js" },
{ name: "test.html", body: "the body of test.html" }];
}]);
app.controller('FileCtrl', ['$scope', '$stateParams', function ($scope, $stateParams) {
$scope.file = $scope.files.find(function (file) { return file.name === $stateParams.name });
$scope.editorOptionsHTML = { mode: 'text/html', lineNumbers: true, matchBrackets: true };
}]);
</script>
</head>
<body ng-controller="MainCtrl">
<div class="row">
<div class="col-sm-3 col-md-3 col-xl-3 col-lg-3">
<div ng-repeat="file in files track by $index">
<a ui-sref="file({name: file.name})">{{file.name}}</a>
</div>
</div>
<div class="col-sm-9 col-md-9 col-xl-9 col-lg-9">
<ui-view></ui-view>
</div>
</div>
</body>
</html>
Every time you click on the link, it is creating new editor, which is an expense operation.
The best approach is to create one editor and load the content on every click.
so I removed the ui-router linking (ui-sref) and related controllers
<script>
var app = angular.module('flapperNews', ['ui', 'ui.router']);
app.controller('MainCtrl', ['$scope', '$state', function ($scope, $state) {
$scope.files = [
{ name: "index.html", body: "<html><body>index.html</body></html>" },
{ name: "index.js", body: "the body of index.js" },
{ name: "test.html", body: "the body of test.html" }];
$scope.editorOptionsHTML = { mode: 'text/html', lineNumbers: true, matchBrackets: true };
// for every click event it will load the content
$scope.go=function(file){
$scope.file=file;
}
}]);
and the body
<body ng-controller="MainCtrl">
<div class="row">
<div class="col-sm-3 col-md-3 col-xl-3 col-lg-3">
<div ng-repeat="file in files track by $index">
<a ng-click="go(file)">{{file.name}}</a>
</div>
</div>
<div class="col-sm-9 col-md-9 col-xl-9 col-lg-9">
<textarea ui-codemirror="editorOptionsHTML" ng-model="file.body"></textarea>
</div>
</div>
</body>
Example : JSBin
you could avoid the flick by adding hide class to textarea like the following code ( jsbin )
template: '<textarea class="hide" ui-codemirror="editorOptionsHTML" ng-model="file.body"></textarea>',
Question
In the below example, how do I bind the obj.name variable of the <input> field in <test-element2> to <test-element> ?
Background:
Below is my code. I have two polymer elements. test-element has the data binded to obj.name. test-element2 has an input field which is observed by the function objChanged. Whatever value I change in the input field it changes and prints in test-element2 but the change isn't reflected in test-element. Can any body help get the value reflected to test-element1? I have a solution using this.fire("object-change") for when the text changes but I am looking for a solution without using event listeners.
One more thing is that I need to create an element from the script and it cannot be hardcoded in the HTML DOM.
Code:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Demo</title>
<script src="../../bower_components/webcomponentsjs/webcomponents-lite.js"></script>
<link rel="import" href="../../bower_components/polymer/polymer.html"/>
</head>
<body>
<dom-module id="test-element">
<template>
<div>Hello <span>{{obj.name}}</span></div>
</template>
<script>
TestElement = Polymer({
is: "test-element",
properties: {
"obj": {
type: Object,
notify: true
}
},
observers: [
"objChanged(obj.name)"
],
"objChanged": function() {
var that = this;
console.log("First element in 1",that.obj);
}
});
</script>
</dom-module>
<dom-module id="test-element2">
<template>
<input value="{{obj.name::input}}"/>
</template>
<script>
Polymer({
is: "test-element2",
properties: {
"obj": {
type: Object,
notify: true,
value: {
"name": "Charlie"
}
}
},
observers: [
"objChanged(obj.name)"
],
ready: function() {
var element = new TestElement();
element.set("obj", this.obj);
this.appendChild(element);
},
"objChanged": function() {
console.log("changed in test-element2:", this.obj);
}
});
</script>
</dom-module>
<test-element2></test-element2>
</body>
</html>
If you include <test-element> in the <template> of test-element2 you can avoid using event listeners or observers. In this way test-element2 handles the data binding between the input and <test-element> for you.
Below is a live working example that maintains the obj property as you have set it up in your elements.
<script src="http://www.polymer-project.org/1.0/samples/components/webcomponentsjs/webcomponents.min.js"></script>
<link rel="import" href="http://www.polymer-project.org/1.0/samples/components/polymer/polymer.html">
<dom-module id="test-element">
<template>
<div>Hello <span>[[obj.name]]</span>
</div>
</template>
<script>
TestElement = Polymer({
is: "test-element",
properties: {
"obj": {
type: Object,
notify: true
}
}
});
</script>
</dom-module>
<dom-module id="test-element2">
<template>
<input value="{{obj.name::input}}" />
<test-element obj="[[obj]]"></test-element>
</template>
<script>
Polymer({
is: "test-element2",
properties: {
"obj": {
type: Object,
notify: true,
value: {
"name": "Charlie"
}
}
}
});
</script>
</dom-module>
<test-element2></test-element2>
Currently, imperative data-binding is not supported in Polymer 1.0 outside of <template is="dom-bind">.
Polymer 1.0 Node.bind() - Can I create a binding via javascript instead of double braces?
Binding imperatively
[1.0] Data-binding: Is there any way to do this imperatively?
I would recommend setting up observers like the example below or adjusting your requirements to include <test-element> in test-element2.
button {
display: block;
}
<script src="http://www.polymer-project.org/1.0/samples/components/webcomponentsjs/webcomponents.min.js"></script>
<link rel="import" href="http://www.polymer-project.org/1.0/samples/components/polymer/polymer.html">
<dom-module id="test-element">
<template>
<div>Hello <span>[[obj.name]]</span>
</div>
</template>
<script>
TestElement = Polymer({
is: "test-element",
properties: {
obj: {
type: Object,
notify: true
}
}
});
</script>
</dom-module>
<dom-module id="test-element2">
<template>
<input value="{{obj.name::input}}" />
</template>
<script>
Polymer({
is: "test-element2",
properties: {
obj: {
type: Object,
notify: true,
value: {
"name": "Charlie"
}
}
},
observers: ["objNameChanged(obj.name)"],
objNameChanged: function(newValue) {
Polymer.dom(document).querySelectorAll("test-element").forEach(function(element) {
element.notifyPath("obj.name", newValue);
});
Polymer.dom(this.root).querySelectorAll("test-element").forEach(function(element) {
element.notifyPath("obj.name", newValue);
});
}
});
</script>
</dom-module>
<test-element2></test-element2>
<button>Add test-element to <em>test-element2</em>
</button>
<button>Add test-element to <em>body</em>
</button>
<script>
var testElement2 = document.querySelector("test-element2");
var createTestElement = function(insertPoint) {
var testElement = new TestElement();
testElement.notifyPath("obj.name", testElement2.obj.name);
insertPoint.appendChild(testElement);
};
document.querySelector("button:nth-of-type(2)").addEventListener("click", function() {
createTestElement(Polymer.dom(document).querySelector("body"));
});
document.querySelector("button").addEventListener("click", function() {
createTestElement(Polymer.dom(testElement2.root));
});
</script>
If you choose to break out your elements into their own files, you could follow this Plunker example (by nazerke) demonstrating two-way data binding by having one component observing another's property.
Code
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>
parent-element.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>
first-child.html
<link rel="import" href="http://www.polymer-project.org/1.0/samples/components/polymer/polymer.html">
<dom-module id="first-child">
<template>
<p>first 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>
second-child.html
<link rel="import" href="http://www.polymer-project.org/1.0/samples/components/polymer/polymer.html">
<dom-module id="second-child">
<template>
<p>Second 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 choose to break out your elements into their own files, you could use <iron-meta> to two-way data bind as described here:
Example Code:
<iron-meta key="info" value="foo/bar"></iron-meta>
...
meta.byKey('info').getAttribute('value').
or
document.createElement('iron-meta').byKey('info').getAttribute('value');
or
<template>
...
<iron-meta id="meta"></iron-meta>
...
this.$.meta.byKey('info').getAttribute('value');
....
</template>
If you choose to break out your elements into their own files, you could use <iron-localstorage> to two-way data bind as described here.
Example Code:
<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
}
},
// initializes default if nothing has been stored
initializeDefaultCartoon: function() {
this.cartoon = {
name: "Mickey",
hasEars: true
}
},
// use path set api to propagate changes to localstorage
makeModifications: function() {
this.set('cartoon.name', "Minions");
this.set('cartoon.hasEars', false);
}
});
</script>
<dom-module id="test-element">
<template>
<div>Hello <span>{{name}}</span></div>
</template>
<script>
Polymer({
is: "test-element",
properties: {
name: String
}
});
</script>
</dom-module>
<dom-module id="test-element2">
<template>
<input value="{{name::input}}"/>
<test-element name="[[name]]"></test-element>
</template>
<script>
Polymer({
is: "test-element2",
properties: {
name: String
}
});
</script>
</dom-module>