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kwc-social-comments.js
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/**
`<kwc-social-comments>`
Comment feed for use in social media flavoured components.
Add this component somewhere in your html body, or more likely embed it into another component.
```html
<body>
<kwc-social-comments></kwc-social-comments>
```
The component does not make any assumptions on how you are handling comment loading,
or how they are stored by the api. Control of `loading` and `posting` states
are done through attributes that can be set by any wrapper component.
This component expects a list of comment objects of the following form:
```json
{
"type": "object",
"properties": {
"id": {
"type": "string"
},
"author": {
"type": "object",
"properties": {
"id": {
"type": "string"
},
"username": {
"type": "string"
},
"avatar": {
"type": "string"
},
}
},
"text": {
"type": "string"
},
"createdOn": {
"type": "string"
},
"flags": {
"type": "array",
"items": {}
},
},
"required" : ["id", "text", "createdOn"]
}
```
## State attributes
### Loading
This commponent can be put into a `loading` state by setting the `loaderState` property
or `loader-state` attribute to `"disabled"`.
This will disable the "load more" button until the state is reset to `"on"`.
If there are no more comments to load,
the "load more" button can be hidden by setting the loader state to `"off"`.
### Posting
The comment input can be disabled by setting the `posting` attribute or property on the element
to `true`. This can be used to prevent a user from posting a second comment whilst the first
is still being sent, if this is a desired behaviour.
@demo demo/index.html
*/
import '@polymer/iron-flex-layout/iron-flex-layout.js';
import '@polymer/iron-autogrow-textarea/iron-autogrow-textarea.js';
import '@polymer/iron-image/iron-image.js';
import '@kano/styles/typography.js';
import '@kano/styles/color.js';
import button from '@kano/styles/button.js';
import { PolymerElement, html } from '@polymer/polymer/polymer-element.js';
import { rubbishBin } from '@kano/icons/ui.js';
import { flag } from '@kano/icons/social.js';
class KwcSocialComments extends PolymerElement {
static get template() {
return html`
${button}
<style>
:host {
@apply --layout-vertical;
@apply --layout-center;
@apply --layout-justified;
width: 100%;
--separator-color: #e3e5e6;
--input-border-color: #e3e5e6;
}
:host([tombstone]) * {
visibility: hidden;
}
:host([hidden]) {
display: none !important;
}
.input-comment {
@apply --layout-horizontal;
border-bottom: 1px solid var(--separator-color);
padding: 24px 0;
margin: 0;
width: 100%;
}
.comment-avatar {
border-radius: 50%;
flex: none;
height: 40px;
margin: 0 24px;
overflow: hidden;
position: relative;
width: 40px;
}
.avatar {
height: 40px;
width: 40px;
cursor: pointer;
}
.comment .avatar {
cursor: pointer;
}
iron-image {
height: 32px;
width: 32px;
border-radius: 50%;
}
.comment-form {
@apply --layout-flex-2;
}
.comment-box {
border: 1px solid var(--input-border-color);
border-radius: 3px;
box-sizing: border-box;
font-family: var(--font-body);
font-size: 16px;
line-height: 20px;
padding: 8px 16px 8px 16px;
width: 100%;
}
.comment-box:focus {
border-color: var(--color-azure);
outline: 0;
}
.comment-form-actions {
padding: 16px 0 0 0;
}
.comment {
@apply --layout-horizontal;
@apply --layout-start;
border-bottom: 1px solid var(--separator-color);
padding: 24px 0;
width: 100%;
}
.comment.posting {
opacity: 0.6;
}
.content {
@apply --layout-flex-2;
font-size: 16px;
font-family: var(--font-body);
color: var(--color-abbey);
max-width: 450px;
}
.comment-header {
margin: 0;
}
.content p {
margin: 0;
width: 100%;
}
.content .date {
font-size: 14px;
font-family: var(--font-body);
color: var(--color-grey);
}
p {
font-family: var(--font-body);
color: var(--color-chateau);
font-size: 16px;
line-height: 20px;
word-wrap: break-word;
}
.comment-body {
color: var(--color-black);
min-height: 20px;
}
.comment-error {
color: var(--color-cinnabar);
padding-top: 8px;
}
.comment:hover .action.delete,
.comment:hover .action.flag {
visibility: visible;
}
.author {
color: var(--color-kano-orange);
cursor: pointer;
font-weight: bold;
margin-right: 5px;
}
.actions {
@apply --layout-end;
@apply --layout-vertical;
flex: none;
width: calc(15% - 40px);
}
.control-actions {
@apply --layout-horizontal;
@apply --layout-center;
@apply --layout-end-justified;
}
.action:focus {
outline: 0;
}
.action.delete,
.action.flag {
-webkit-appearance: none;
background: transparent;
border: 0;
border-radius: 3px;
fill: var(--color-stone);
cursor: pointer;
}
.action.delete:hover,
.action.flag:hover {
fill: var(--color-carnation);
}
.action.flag.flagged {
fill: var(--color-carnation);
visibility: visible;
}
.action .icon {
height: 16px;
width: 16px;
}
#retry {
margin-top: 10px;
}
iron-list {
width: 100%;
height: 100%
}
.loader {
margin-top: 20px;
}
.loader[hidden] {
display: block;
}
:host([loader-status="off"]) #loader {
display: none;
}
:host([loader-status="disabled"]) #loader {
background-color: var(--color-porcelain);
color: rgba(41, 47, 53, 1);
}
:host([retry-button="hide"]) #retry {
display: none;
}
@media all and (max-width: 360px) {
.comment-form-actions {
@apply --layout-vertical;
@apply --layout-start;
@apply --layout-start-justified;
}
}
@media all and (min-width: 361px) {
.comment-form-actions {
@apply --layout-horizontal;
@apply --layout-center;
@apply --layout-start-justified;
}
}
:host *[hidden] {
display: none;
}
.submit {
margin-right: 8px;
}
</style>
<div class="input-comment">
<div class="comment-avatar">
<iron-image class="avatar" src$="[[_avatar]]" sizing="cover" preload fade></iron-image>
</div>
<form class="comment-form" on-submit="_submitComment">
<input id="comment-input" class="comment-box" type="text" placeholder$="[[_placeholderText]]" value="{{_comment::input}}" disabled$="[[posting]]" on-focus="_toggleFormControls" on-keydown="_dialogKeydown">
<div class="comment-form-actions">
<button class="btn submit" type="submit" on-tap="_submitComment" disabled="[[!_commentValid]]">
Submit
</button>
<button class="btn secondary" on-tap="_cancelComment">
Cancel
</button>
</div>
</form>
</div>
<template is="dom-repeat" items="[[comments]]" as="comment">
<div id$="[[comment.id]]" class$="comment [[_computePostingClass(comment)]]">
<div class="comment-avatar">
<iron-image class="avatar" src$="[[_computeAvatar(comment.author)]]" sizing="cover" preload fade on-tap="_userTapped"></iron-image>
</div>
<div class="content">
<p class="comment-header">
<span class="author" on-tap="_userTapped">
[[comment.author.username]]
</span>
<span class="date">
[[_timeSince(comment.date_created, comments.*)]] ago
</span>
</p>
<p class="comment-body">
<span inner-h-t-m-l="[[_lb(comment.text)]]"></span>
</p>
<p class="comment-error" hidden$="[[!comment.error]]">
[[comment.error]]
</p>
</div>
<div class="actions">
<div class="control-actions">
<template is="dom-if" if="[[_commentIsDeletable(comment.author.id, user.id, user.admin_level)]]">
<button type="button" class="action delete" on-tap="_deleteButtonTapped">
<div class="icon">${rubbishBin}</div>
</button>
</template>
<button type="button" class$="[[_computeFlagClass(comment.*)]]" on-tap="_flagButtonTapped">
<div class="icon">${flag}</div>
</button>
</div>
<button id="retry" class="btn secondary s" on-tap="_retryButtonTapped" hidden$="[[!comment.error]]" type="warning">
retry
</button>
</div>
</div>
</template>
<button class="btn secondary loader" id="loader" type="secondary" on-tap="_loadMoreData">
Load more
</button>
`;
}
static get properties() {
return {
/**
* Computer value for avatar
* @type {String}
*/
_avatar: {
type: String,
computed: '_computeAvatar(user)',
},
/**
* Current value for comment input
* @type {String}
*/
_comment: {
type: String,
value: '',
},
/**
* Whethe the `_comment` is valid
* @type {Boolean}
*/
_commentValid: {
type: Boolean,
computed: '_commentIsValid(_comment)',
},
/**
* Array of comment objects to render
* @type {Array}
*/
comments: {
type: Array,
value: () => [],
notify: true,
},
/**
* Array of comment ids where user has flagged the specific comments
* @type {Array}
*/
commentFlags: {
type: Array,
value: () => [],
notify: true,
},
/**
* Default Avatar to use when not provided by comment or user data
* @type {String}
*/
defaultAvatar: {
type: String,
value: 'https://s3.amazonaws.com/kano-avatars/default-avatar.svg',
},
/**
* Boolean toggle to show or hide the Submit and Cancel buttons
* on the comment input
* @type {Boolean}
*/
_displayFormActions: {
type: Boolean,
value: false,
},
/**
* An identifier to this comment thread, to be used in the `post-comment` event.
* @type {String}
*/
itemId: {
type: String,
},
/**
* Value of next page of comments if using pagination.
* @type {Number}
*/
nextPage: {
type: Number,
value: 0,
observer: '_onDataLoad',
},
/**
* Text to use as placeholder. Computed on whether we have comments or not.
* @type {String}
*/
_placeholderText: {
type: String,
computed: '_computePlaceholderText(comments)',
},
/**
* Atribute to indicate a comment is being posted. Will disable input.
* @type {Boolean}
*/
posting: {
type: Boolean,
value: false,
},
/**
* Atribute to loader status of the component.
* Can be one of `on|off|disabled`. Will disable (disabled) or hide (off) load button.
* @type {String}
*/
loaderStatus: {
type: String,
value: 'off',
reflectToAttribute: true,
},
/**
* Atribute used to hide the retry button once clicked.
* @type {Boolean}
*/
retryButton: {
type: String,
reflectToAttribute: true,
},
/**
* Current authenticated user.
* @type {String}
*/
user: {
type: Object,
value: () => ({}),
},
};
}
_dialogKeydown(e) {
if (e.keyCode === 8) {
e.stopPropagation();
}
}
/**
* Reset the `_comment` back to an empty String and hide the form
* actions
*/
_cancelComment() {
this._comment = '';
this._displayFormActions = false;
}
/** Show the Submit and Cancel buttons on the comment input */
_toggleFormControls() {
this._displayFormActions = true;
}
/**
* Decide whether the current comment is valid
* @param {String} comment
* @returns {Boolean}
*/
_commentIsValid() {
/**
* Prevent users trying to submit either blank comments, or,
* equally annoying, lots of spaces.
*/
if (!this._comment || /^ *$/.test(this._comment)) {
return false;
}
return true;
}
_computeAvatar(user) {
if (user) {
return user.avatar || this.defaultAvatar;
}
return this.defaultAvatar;
}
_onDataLoad() {
this.$.loader.disabled = false;
}
_loadMoreData() {
if (!this.itemId || this.$.loader.disabled) {
return;
}
this.$.loader.disabled = true;
this.dispatchEvent(new CustomEvent('load-comment', {
detail: {
id: this.itemId,
},
}));
}
_createDate(formatted) {
return new Date(formatted);
}
/**
* Compute whether a comment is deletable by the current user
* – either they must have written the comment, or they must be
* a Kano admin.
* @param {String} commentAuthorId
* @param {String} userId
* @param {Number} userAdminLevel
* @returns {Boolean}
*/
_commentIsDeletable(commentAuthorId, userId, userAdminLevel) {
return commentAuthorId === userId || userAdminLevel > 0;
}
_computeFlag(flags) {
if (!flags || !this.user) {
return false;
}
return flags.some(f => f.author === this.user.id);
}
_computeCommentFlag(comment) {
if (this.commentFlags.length === 0) {
return false;
}
return this.commentFlags.some(f => f === comment.id);
}
_computeFlagClass(splice) {
const baseClass = 'action flag';
let activeClass;
if (splice.base.flags) {
activeClass = this._computeFlag(splice.base.flags) ? 'flagged' : 'unflagged';
} else {
activeClass = this._computeCommentFlag(splice.base) ? 'flagged' : 'unflagged';
}
return `${baseClass} ${activeClass}`;
}
_computePlaceholderText(comments) {
if (!comments || !comments.length) {
return 'Be the first to comment';
}
return 'Leave a comment';
}
_computePostingClass(comment) {
return `${comment.posting ? 'posting' : ''}${comment.error ? 'error' : ''}`;
}
_computeErrorClass(error) {
return error ? 'error' : '';
}
_computeErrorState(error) {
return error ? true : '';
}
/**
* Dispatch the event to delete a comment
* @param {Event} e
*/
_deleteButtonTapped(e) {
const commentId = e.model.comment.id;
if (!commentId) {
return;
}
this.dispatchEvent(new CustomEvent('delete-comment', {
detail: {
index: e.model.index,
id: commentId,
},
}));
}
_isHintHidden() {
return true;
}
_lb(value) {
const safeDiv = document.createElement('div');
safeDiv.textContent = value;
return safeDiv.innerHTML.replace(/\n/g, '<br>');
}
/**
* Fired when flag icon is pressed on an individual comment.
*
* @event flag-comment
* @param {string} index Index in comments array.
* @param {string} id Id of comment as given by comment object.
*/
_flagButtonTapped(e) {
const { index } = e.model;
const { id } = this.comments[index];
let flagged;
if (this.comments[index].flags) {
flagged = this._computeFlag(this.comments[index].flags);
if (flagged) {
return;
}
} else {
flagged = this._computeCommentFlag(this.comments[index]);
}
if (flagged) {
e.path[1].setAttribute('class', 'action flag unflagged');
this.dispatchEvent(new CustomEvent('unflag-comment', {
detail: {
index,
id,
},
}));
return;
}
e.path[1].setAttribute('class', 'action flag flagged');
this.dispatchEvent(new CustomEvent('flag-comment', {
detail: {
index,
id,
},
}));
}
/**
* Fired when retry is clicked on an individual comment that has errored.
*
* @event post-comment
* @param {string} value Comment text.
* @param {boolean} retry Flag to indicate the post is a retry.
*/
_retryButtonTapped() {
this.set('retryButton', 'hide');
this.dispatchEvent(new CustomEvent('post-comment', {
detail: {
value: this.comments[0].text,
retry: true,
},
}));
}
/**
* Fired when new comment is submited.
*
* @event post-comment
* @param {string} value Comment text.
*/
_submitComment(e) {
e.preventDefault();
const input = this.$['comment-input'];
if (this._commentValid) {
this.retryButton = null;
/**
* Hide the Submit and Cancel buttons and blur the input
* so that the user has to reselect (and therfore show the
* controls) if they want to submit another comment.
*/
this._displayFormActions = false;
if (input) {
input.blur();
}
this.dispatchEvent(new CustomEvent('post-comment', {
detail: {
value: this._comment,
},
}));
this._comment = '';
}
}
_timeSince(date) {
const parsedDate = new Date(Date.parse(date));
const seconds = Math.floor((new Date() - parsedDate) / 1000);
let interval = Math.floor(seconds / 31536000);
if (interval >= 1) {
return this.multipleCheck(interval, 'year');
}
interval = Math.floor(seconds / 2592000);
if (interval >= 1) {
return this.multipleCheck(interval, 'month');
}
interval = Math.floor(seconds / 86400);
if (interval >= 1) {
return this.multipleCheck(interval, 'day');
}
interval = Math.floor(seconds / 3600);
if (interval >= 1) {
return this.multipleCheck(interval, 'hour');
}
interval = Math.floor(seconds / 60);
if (interval >= 1) {
return this.multipleCheck(interval, 'minute');
}
return `${Math.floor(seconds)} seconds`;
}
multipleCheck(interval, unit) {
const baseDate = `${interval} ${unit}`;
return interval === 1 ? baseDate : `${baseDate}s`;
}
/**
* Fired when the user icon or name is tapped on an individual comment.
*
* @event view-user
* @param {string} id provided by the `comment.author.id` property.
*/
_userTapped(e) {
const { index } = e.model;
const { author } = this.comments[index];
if (author) {
this.dispatchEvent(new CustomEvent('view-user', {
detail: {
id: author.id,
username: author.username,
},
}));
}
}
}
customElements.define('kwc-social-comments', KwcSocialComments);