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How is it possible that piece of code that was working is now ignored?

I have coded a ajax based "JS TABS" containing .JSON file like 10 months ago, now wanted to reuse it, and can't find out why it's not working. I haven't touched it since and don't know where is the bug.
When i click the button to render products nothing prints out - except console telling me: items is undefined = so i moved it inside function changeCategoryItems(categoryId) { } well no errors but nothing renders...can someone help me ?
Here is a codepen reference of what i mean: https://codepen.io/Contemplator191/pen/WNwgypY
And this is JSON : https://api.jsonbin.io/b/5f634e0c302a837e95680846
If codepen is not suitable/allowed here is whole JS for that
let items = [];
const buttons = document.querySelectorAll('button');
const wrapper = document.querySelector('section.products');
buttons.forEach(function (button) {
button.addEventListener('click',event => {
changeCategoryItems(event.target.dataset.category);
});
});
function changeCategoryItems(categoryId) {
let items = [];
const buttons = document.querySelectorAll('button');
const wrapper = document.querySelector('section.products');
const viewItems = (categoryId == 0 ) ? items : items.filter(item => item.category == categoryId);
wrapper.innerHTML = "";
viewItems.forEach(item => {
const div = document.createElement('div');
div.setAttribute("class", "product");
div.innerHTML = createItem(item);
wrapper.appendChild(div);
});
};
function createItem(item) {
return `
<div class="product__img">
<img src="${item.img}" class="">
</div>
<div class="product__name _tc">
<h4 class="">${item.heading}</h4>
</div>
<div class="text-desc product__desc">
<p class="">${item.description}</p>
</div>
<div class="product__bottom-content">
<span class="product__info">${item.info}</span>
${item.btn}
</div>
`
}
fetch('https://api.jsonbin.io/b/5f634e0c302a837e95680846')
.then(function (res) { return res.json() })
.then(function (data) {
items = data.items;
changeCategoryItems(1);
});`

In your fetch you're trying to assign data.items to the items variable but the api doesn't return data with an items node so items is undefined. It's possible the api changed their return format since the last time you used it which would explain why it worked previously.
this seems to fix it
.then(function (data) {
items = data;
changeCategoryItems(1);
});

Your issue is in this line:
items = data.items;
Now, the returned value is an array, hence you can use it as it is.
The updated codepen

Vue v-for autofocus on new textarea

I'm making a blog and would like the user to be able to create new textareas when they hit enter and for it to autofocus on the newly created textarea. I've tried using the autofocus attribute, but that doesn't work. I've also tried using the nextTick function, but that doesn't work. How do I do this?
<div v-for="(value, index) in content">
<textarea v-model="content[index].value" v-bind:ref="'content-'+index" v-on:keyup.enter="add_content(index)" placeholder="Content" autofocus></textarea>
</div>
and add_content() is defined as follows:
add_content(index) {
var next = index + 1;
this.content.splice(next, 0, '');
//this.$nextTick(() => {this.$refs['content-'+next].contentTextArea.focus()})
}

You're on the right path, but this.$refs['content-'+next] returns an array, so just access the first one and call .focus() on that
add_content(index) {
var next = index + 1;
this.content.splice(next, 0, {
value: "Next"
});
this.$nextTick(() => {
this.$refs["content-" + next][0].focus();
});
}
Working Example
var app = new Vue({
el: '#app',
data() {
return {
content: [{
value: "hello"
}]
};
},
methods: {
add_content(index) {
var next = index + 1;
this.content.splice(next, 0, {
value: "Next"
});
this.$nextTick(() => {
this.$refs["content-" + next][0].focus();
});
}
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>
<div id="app">
<div v-for="(value, index) in content">
<textarea v-model="content[index].value" v-bind:ref="'content-' + index" v-on:keyup.enter="add_content(index);" placeholder="Content" autofocus></textarea>
</div>
</div>
Also, your value in the array seems to be an object rather than a string, so splice in an object rather than an empty string

How to Paginate a Computed Property in Vue

I am creating a Vue app, where a list of jobs will be displayed and this data is coming from a JSON object. In this app I also am adding filtering functionality as well as pagination. So what I have so far is:
<div id="app" v-cloak>
<h2>Location</h2>
<select v-model="selectedLocation" v-on:change="setPages">
<option value="">Any</option>
<option v-for="location in locations" v-bind:value="location" >{{ location }}</option>
</select>
<div v-for="job in jobs">
<a v-bind:href="'/job-details-page/?entity=' + job.id"><h2>{{ job.title }}</h2></a>
<div v-if="job.customText12"><strong>Location:</strong> {{ job.customText12 }}</div>
</div>
<div class="paginationBtns">
<button type="button" v-if="page != 1" v-on:click="page--">Prev</button>
<button type="button" v-for="pageNumber in pages.slice(page-1, page+5)" v-on:click="page = pageNumber"> {{pageNumber}} </button>
<button type="button" v-if="page < pages.length" v-on:click="page++">Next</button>
</div>
<script>
var json = <?php echo getBhQuery('search','JobOrder','isOpen:true','id,title,categories,dateAdded,externalCategoryID,employmentType,customText12', null, 200, '-dateAdded');?>;
json = JSON.parse(json);
var jsonData = json.data;
var app = new Vue({
el: '#app',
data() {
return {
//assigning the jobs JSON data to this variable
jobs: jsonData,
locations: ['Chicago', 'Philly', 'Baltimore'],
//Used to filter based on selected filter options
selectedLocation: '',
page: 1,
perPage: 10,
pages: [],
}
},
methods: {
setPages () {
this.pages = [];
let numberOfPages = Math.ceil(this.jobs.length / this.perPage);
for (let i = 1; i <= numberOfPages; i++) {
this.pages.push(i);
}
},
paginate (jobs) {
let page = this.page;
let perPage = this.perPage;
let from = (page * perPage) - perPage;
let to = (page * perPage);
return jobs.slice(from, to);
},
}
watch: {
jobs () {
this.setPages();
}
},
})
computed: {
filteredJobs: function(){
var filteredList = this.jobs.filter(el=> {
return el.customText12.toUpperCase().match(this.selectedLocation.toUpperCase())
});
return this.paginate(filteredList);
}
}
</script>
So the issue I am running into is that I want the amount of pages to change when the user filters the list using the select input. The list itself changes, but the amount of pages does not, and there ends up being a ton of empty pages once you get past a certain point.
I believe the reason why this is happening is the amount of pages is being set based on the length of the jobs data object. Since that never changes the amount of pages stays the same as well. What I need to happen is once the setPages method is ran it needs to empty the pages data array, then look at the filteredJobs object and find the length of that instead of the base jobs object.
The filteredJobs filtering is a computed property and I am not sure how to grab the length of the object once it has been filtered.
EDIT: Okay so I added this into the setPages method:
let numberOfPages = Math.ceil(this.filteredJobs.length / this.perPage);
instead of
let numberOfPages = Math.ceil(this.jobs.length / this.perPage);
and I found out it is actually grabbing the length of filteredJobs, but since I am running the paginate method on that computed property, it is saying there is only 10 items in the filteredJobs array currently and will only add one pagination page. So grabbing the length of filteredJobs may not be the best route for this. Possibly setting a data variable to equal the filtered jobs object may be better and grab the length of that.

How do I give React methods to the onClick handler of an html component?

I'm trying to change the HTML received from a database to respond to custom onClick handlers. Specifically, the HTML I pull has divs called yui-navsets which contain yui_nav page selectors and yui_content page contents. I want to click an li in yui_nav, set that li's class to "selected", set the existing content to display:none, and set the new content to style="".
To do this, I have created a function updateTabs which inputs the index of the chosen yui and the new page number, set that li's class to "selected", set the existing content to display:none, and set the new content to style="". This function works: I tried running updateTabs(2, 3) in componentDidUpdate, and it worked fine, changing the content as requested. I want to assign updateTabs to each of the lis, and I attempt to do so in my componentDidMount after my axios request.
However, I keep getting the error: TypeError: this.updateTabs is not a function. Please help?
Page.js:
import React, { Component } from 'react';
import axios from 'axios';
class Page extends Component {
constructor(props) {
super(props);
this.state = {
innerHTML: "",
pageTags: [],
};
console.log(this.props.url);
}
componentDidMount() {
console.log(this.props.url);
axios
.get(
this.props.db_address + "pages?url=" + this.props.url,
{headers: {"Access-Control-Allow-Origin": "*"}}
)
.then(response => {
this.setState({
innerHTML: response.data[0].html,
pageTags: response.data[1]
});
console.log(response);
// Check for yui boxes, evade the null scenario
var yui_sets = document.getElementsByClassName('yui-navset');
if (yui_sets !== null) {
let yui_set, yui_nav, yui_content;
// Iterate through the navs of each set to find the active tabs
for (var yui_set_count = 0; yui_set_count < yui_sets.length; yui_set_count ++) {
yui_set = yui_sets[yui_set_count];
yui_nav = yui_set.getElementsByClassName('yui-nav')[0].children;
yui_content = yui_set.getElementsByClassName('yui-content')[0].children;
let tab_count;
// Give each nav and tab and appropriate ID for testing purposes
for (tab_count = 0; tab_count < yui_nav.length; tab_count ++) {
yui_nav[tab_count].onclick = function() { this.updateTabs(yui_set_count); }
yui_nav[tab_count].id = "nav-"+ yui_set_count.toString() + "-" + tab_count.toString()
yui_content[tab_count].id = "content-"+ yui_set_count.toString() + "-" + tab_count.toString()
}
}
}
})
.catch(error => {
this.setState({ innerHTML: "ERROR 404: Page not found." })
console.log(error);
});
}
updateTabs(yui_index, tab_index){
// Get all yuis
var yui_sets = document.getElementsByClassName('yui-navset');
let yui_set, yui_nav, yui_content
yui_set = yui_sets[yui_index];
yui_nav = yui_set.getElementsByClassName('yui-nav')[0].children;
yui_content = yui_set.getElementsByClassName('yui-content')[0].children;
// Identify the current active tab
var current_tab_found = false;
var old_index = -1;
while (current_tab_found == false) {
old_index += 1;
if (yui_nav[old_index].className === "selected") {
current_tab_found = true;
}
}
// Identify the new and old navs and contents
var yui_nav_old = yui_nav[old_index]
var yui_nav_new = yui_nav[tab_index]
var yui_content_old = yui_content[old_index]
var yui_content_new = yui_content[tab_index]
// Give the new and old navs and contents their appropriate attributes
yui_nav_old.className = "";
yui_nav_new.className = "selected";
yui_content_old.style = "display:none";
yui_content_new.style = "";
}
render() {
return (
<div className="Page">
<div className="Page-html col-12" dangerouslySetInnerHTML={{__html:this.state.innerHTML}} />
<div className="Page-footer">
<div className="d-flex flex-wrap btn btn-secondary justify-content-around">
{this.state.pageTags.map(function(pageTag){return(
<div className="pd-2" key={pageTag.id}>
{pageTag.name}
</div>
)})}
</div>
<div className="d-flex justify-content-center" >
<div className="p-2">Discuss</div>
<div className="p-2">Rate</div>
<div className="p-2">Edit</div>
</div>
<div className="d-flex justify-content-around App">
<div className="p-2">
Unless otherwise stated, the content
of this page is licensed under <br />
<a href="http://creativecommons.org/licenses/by-sa/3.0/"
target="_blank" rel="noopener noreferrer">
Creative Commons Attribution-ShareAlike 3.0 License
</a>
</div>
</div>
</div>
</div>
)
}
}
export default Page

Instead of function with function keyword use arrow functions and it will be solved as follows
You have
yui_nav[tab_count].onclick = function() { this.updateTabs(yui_set_count); }
But use
yui_nav[tab_count].onclick = () => { this.updateTabs(yui_set_count); }
Use this in componentDidMount method

You have to bind the updateTabs method in the constructor:
constructor(props) {
super(props);
...
this.updateTabs = this.updateTabs.bind(this);
}
You should use arrow functions in order to call this method with the correct contetxt:
yui_nav[tab_count].onclick = () => { this.updateTabs(yui_set_count); }

Vue.js 2 - Array change detection

Here's a simplified version of my code :
<template>
/* ----------------------------------------------------------
* Displays a list of templates, #click, select the template
/* ----------------------------------------------------------
<ul>
<li
v-for="form in forms.forms"
#click="selectTemplate(form)"
:key="form.id"
:class="{selected: templateSelected == form}">
<h4>{{ form.name }}</h4>
<p>{{ form.description }}</p>
</li>
</ul>
/* --------------------------------------------------------
* Displays the "Editable fields" of the selected template
/* --------------------------------------------------------
<div class="form-group" v-for="(editableField, index) in editableFields" :key="editableField.id">
<input
type="text"
class="appfield appfield-block data-to-document"
:id="'item_'+index"
:name="editableField.tag"
v-model="editableField.value">
</div>
</template>
<script>
export default {
data: function () {
return {
editableFields: [],
}
},
methods: {
selectTemplate: function (form) {
/* ------------------
* My problem is here
*/ ------------------
for (let i = 0; i < form.editable_fields.length; i++) {
this.editableFields.push(form.editable_fields[i]);
}
}
}
}
</script>
Basically I want to update the array EditableFields each time the user clicks on a template. My problem is that Vuejs does not update the display because the detection is not triggered. I've read the documentation here which advise to either $set the array or use Array instance methods only such as splice and push.
The code above (with push) works but the array is never emptied and therefore, "editable fields" keep pilling up, which is not a behavior I desire.
In order to empty the array before filling it again with fresh data, I tried several things with no luck :
this.editableFields.splice(0, this.editableFields.length);
for (let i = 0; i < form.editable_fields.length; i++) {
this.editableFields.push(form.editable_fields[i]);
}
==> Does not update the display
for (let i = 0; i < form.editable_fields.length; i++) {
this.$set(this.editableFields, i, form.editable_fields[i]);
}
==> Does not update the display
this.editableFields = form.editable_fields;
==> Does not update the display
Something I haven't tried yet is setting a whole new array with the fresh data but I can't understand how I can put that in place since I want the user to be able to click (and change the template selection) more than once.
I banged my head on that problem for a few hours now, I'd appreciate any help.
Thank you in advance :) !

I've got no problem using splice + push. The reactivity should be triggered normally as described in the link you provided.
See my code sample:
new Vue({
el: '#app',
data: function() {
return {
forms: {
forms: [{
id: 'form1',
editable_fields: [{
id: 'form1_field1',
value: 'form1_field1_value'
},
{
id: 'form1_field2',
value: 'form1_field2_value'
}
]
},
{
id: 'form2',
editable_fields: [{
id: 'form2_field1',
value: 'form2_field1_value'
},
{
id: 'form2_field2',
value: 'form2_field2_value'
}
]
}
]
},
editableFields: []
}
},
methods: {
selectTemplate(form) {
this.editableFields.splice(0, this.editableFields.length);
for (let i = 0; i < form.editable_fields.length; i++) {
this.editableFields.push(form.editable_fields[i]);
}
}
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.3.4/vue.min.js"></script>
<div id="app">
<ul>
<li v-for="form in forms.forms"
#click="selectTemplate(form)"
:key="form.id">
<h4>{{ form.id }}</h4>
</li>
</ul>
<div class="form-group"
v-for="(editableField, index) in editableFields"
:key="editableField.id">
{{ editableField.id }}:
<input type="text" v-model="editableField.value">
</div>
</div>

Problem solved... Another remote part of the code was in fact, causing the problem.
For future reference, this solution is the correct one :
this.editableFields.splice(0, this.editableFields.length);
for (let i = 0; i < form.editable_fields.length; i++) {
this.editableFields.push(form.editable_fields[i]);
}
Using only Array instance methods is the way to go with Vuejs.