What is the best way to load a page without refreshing using graphql and dynamic routing.
I have a file called kindergarten that loads perfectly without refreshing the whole page :
<script context="module">
import { gql, GraphQLClient } from 'graphql-request'
export async function load() {
const graphcms = new GraphQLClient(import.meta.env.VITE_GRAPHCMS_URL, {
headers: {},
})
const query = gql`
query MyQuery {
terms(where: { taxonomies: CATEGORY }) {
nodes {
slug
name
termTaxonomyId
}
}
}
`
const { terms } = await graphcms.request(query)
return {
props: {
posts: terms.nodes,
},
}
}
</script>
<script>
import { SITE_NAME } from '$lib/store.js'
let date = new Date()
const [month, day, year] = [
date.getMonth() + 1,
date.getDate(),
date.getFullYear(),
]
export let posts = []
</script>
<svelte:head>
<title>Sample Title - {SITE_NAME}</title>
<meta
name="description"
content="Sample description [Update: {year}/{month}/{day}]" />
</svelte:head>
{#each posts as post (post.termTaxonomyId)}
<a
tax-id={post.termTaxonomyId}
href="/kindergarten/province/{post.slug}"
target="blank">
{post.name}
</a>
<br />
{/each}
and also I have another page called [slug].svelte :
<script context="module">
import { gql, GraphQLClient } from 'graphql-request'
export async function load(ctx) {
let slug = ctx.page.params.slug
const graphcms = new GraphQLClient(import.meta.env.VITE_GRAPHCMS_URL, {
headers: {},
})
const query = gql`
query MyQuery {
terms(where: { taxonomies: CATEGORY, slug: "${slug}" }) {
nodes {
name
description
}
}
}
`
const { terms } = await graphcms.request(query)
return { props: { slug, post: terms.nodes } }
}
</script>
<script>
import { SITE_NAME } from '$lib/store.js'
export let slug
export let post
</script>
<svelte:head>
<title>{post[0].name} - {SITE_NAME}</title>
</svelte:head>
<h1>Slug : {slug}</h1>
{#each post as data}
<p>Name: {data.name}</p>
<br />
{#if data.description}
<p>Description: {data.description}</p>
{:else}
<p>Ther is no Description</p>
{/if}
{/each}
When I click a link on kindergarten page it goes to the subpage but refreshes the whole site.
How can I optimize the [slug].svelte file to prevent refreshing the page?
As I'm new to Svelte and Sveltekit, any ideas for optimizing the whole code is appreciated.
You're linking to a new page, so it makes sense it refreshes, because it's going to a whole new page ([slug].svelte). It sounds like you're trying to load data into your kindergarten.svelte page? In that case, make a component, not a page, where you can pass in data to the component, and the component will be updated, rather than the entire page. Check out an example from the docs here: https://svelte.dev/tutorial/component-bindings
I am building a React form in the CRM pane of Flex which will POST data to an external service when the agent fills out the form and hits a submit button. Using the example code from create-flex-plugin from Plugin Builder v3, I have successfully persisted the data from a form field in redux. However, as an agent in Flex, if I have multiple reservations open, when I toggle between them they use the same data. How do I design my form so that an agent can enter data in the form for different reservations and they are kept separately?
I am relatively new to Flex, React and Redux, and not sure if there is anything Flex-specific about what I need to do, especially when handling multiple concurrent reservations. I've thought of keeping a Map keyed by reservationId or taskId in redux, but it's not clear how I'd pass the taskId into the reducer. I am also not sure if other tools like redux-form will play nice with Flex's design.
Being pointed in the right direction or getting some sample code would be a great help.
My current implementation, which persists a field called 'subcategory', looks like this:
HrmFormState.js
const UPDATE_FORM = 'UPDATE_FORM';
const initialState = {
subcategory: 'my category',
};
export class Actions {
static updateForm = (e) => ({ type: UPDATE_FORM, text: e.target.value });
}
export function reduce(state = initialState, action) {
switch (action.type) {
case UPDATE_FORM: {
return {
...state,
subcategory: action.text,
};
}
default:
return state;
}
}
HrmForm.Container.js
import { connect } from 'react-redux';
import { bindActionCreators } from 'redux';
import { Actions } from '../../states/HrmFormState';
import HrmForm from './HrmForm';
const mapStateToProps = (state) => ({
subcategory: state['hrm-form'].hrmForm.subcategory,
});
const mapDispatchToProps = (dispatch) => ({
updateForm: bindActionCreators(Actions.updateForm, dispatch),
});
export default connect(mapStateToProps, mapDispatchToProps)(HrmForm);
HrmForm.jsx (snippet)
render() {
if (!this.props.task) {
return null;
}
return (
<HrmFormComponentStyles>
<form onSubmit={this.handleSubmit}>
<label>
Subcategory:
<input type="text" value={this.props.subcategory}
onChange={this.props.updateForm} />
</label>
<input type="submit" value="Submit" />
</form>
</HrmFormComponentStyles>
);
}
I'm building a page that show dynamically some photos in a feed like Instagram. I'm getting stuck trying to avoid everytime I load a page or I go into a photo's detail page and then go back, to do an API request to Laravel controller, so that means fetching data and images, losing the position of the page and starting on the top of the page.
My code:
Feed.vue
<template>
<div v-for="(image, index) in images" :key="index">
<v-img :src="image.path" class="image-masonry mini-cover" slot-scope="{ hover }"></v-img>
</div>
</template>
<script>
export default {
data() {
return {
images: []
}
},
mounted() {
this.getImagesHome();
},
methods: {
getImagesHome() {
this.axios.get('/api/images', {},
).then(response => {
this.images = response.data;
}).catch(error => {
console.log(error);
});
},
}
}
</script>
Edit:
I saw that keep-alive is primarily used to preserve component state or avoid re-rendering it. But i can't understand how to use it. I call my Feed.vue component in another Home.vue as below:
<template>
<v-app>
<Toolbar #toggle-drawer="$refs.drawer.drawer = !$refs.drawer.drawer"></Toolbar>
<Navbar ref="drawer"></Navbar>
<keep-alive>
<Feed></Feed>
</keep-alive>
</v-app>
</template>
<script>
import store from '../store';
export default {
components: {
'Toolbar' : () => import('./template/Toolbar.vue'),
'Navbar' : () => import('./template/Navbar.vue'),
'Feed' : () => import('./Feed.vue')
}
}
</script>
What i have to put more in keep-alive and what i have to change in my Feed.vue component?
mounted() should only be called once.
There seem to be multiple ways to go about this.
If you are using vue-router, then have a look at scrollBehaviour
https://router.vuejs.org/guide/advanced/scroll-behavior.html
From their documentation,
const router = new VueRouter({
routes: [...],
scrollBehavior (to, from, savedPosition) {
// return desired position
}
})
You can also try using keep-alive: https://v2.vuejs.org/v2/api/#keep-alive
It keeps the component in memory so it is not destroyed, you get activated and deactivated events to check when it comes into view.
But I don't think it saves scroll position, so you may want to use this in combination with scrollBehaviour
I'm using Redux Form in one of my projects (pretty much just copying the dynamic one from Rally Coding), but whenever I access this.props.fields, it simply gives me an array of the names of my fields as opposed to an object. What's even weirder is that I'm copying and pasting this code into another one of my projects that uses RF and it's giving me what I want from this.props.fields. Part of me thinks that I set RF up incorrectly, but I did import the formReducer into App.js and combined it with my other reducers.
When I hit the debugger, this.props.fields = ['query', 'numberOfResults'] which is messing everything up.
Here's my code:
import _ from 'lodash';
import React, { Component, PropTypes } from 'react';
import { Field, reduxForm } from 'redux-form';
const FIELDS = {
query: {
type: 'input',
label: 'What are you looking for?'
},
numberOfResults: {
type: 'input',
label: 'Number of Results'
}
};
class YelpForm extends Component {
onSubmit(props) {
console.log('hey cutie')
}
renderField(fieldConfig, field) {
debugger
const fieldHelper = this.props.fields[field]
return (
<div className={`form-group ${fieldHelper.touched && fieldHelper.invalid ? 'has-danger' : '' }`} >
<label>{fieldConfig.label}</label>
<fieldConfig.type type="text" className="form-control" {...fieldHelper} />
<div className="text-help">
{fieldHelper.touched ? fieldHelper.error : ''}
</div>
</div>
);
}
render() {
const { handleSubmit } = this.props;
return (
<form onSubmit={handleSubmit(props => this.onSubmit(props))} >
{_.map(FIELDS, this.renderField.bind(this))}
<input type="submit">Submit</input>
</form>
);
}
}
function validate(values) {
const errors = {};
_.each(FIELDS, (type, field) => {
if (!values[field]) {
errors[field] = `Enter a ${field}`;
}
});
return errors;
}
export default reduxForm({
form: 'Yelp Form',
fields: _.keys(FIELDS),
validate
})(YelpForm);
This is my first question on StackOverflow; thanks for the help in advance!
Try downgrading to redux-form version 5.2.3. It seems version 6.0.2 is either buggy, or not documented correctly.
On the official pages and in the GitHub issues for redux-form there are more than one example of how to work with initialValues however I cannot find a single one that focuses on explaining how initialValues can be set in response to an asynchronous source.
The main case that I have in mind is something like a simple CRUD application where a user is going to edit some entity that already exists. When the view is first opened and the redux-form component is mounted but before the component is rendered the initialValues must be set. Lets say that in this example that the data is loaded on demand when the component is first mounted and rendered for the first time. The examples show setting initialValues based on hard coded values or the redux store state but none that I can find focus on how to set the initialValues based on something async like a call to XHR or fetch.
I'm sure I'm just missing something fundamental so please point me in the right direction.
References:
Initializing Form State
Handling form defaults
What is the correct way to populate a dynamic form with initial data?
EDIT: Updated Solution from ReduxForm docs
This is now documented in the latest version of ReduxForm, and is much simpler than my previous answer.
The key is to connect your form component after decorating it with ReduxForm. Then you will be able to access the initialValues prop just like any other prop on your component.
// Decorate with reduxForm(). It will read the initialValues prop provided by connect()
InitializeFromStateForm = reduxForm({
form: 'initializeFromState'
})(InitializeFromStateForm)
// now set initialValues using data from your store state
InitializeFromStateForm = connect(
state => ({
initialValues: state.account.data
})
)(InitializeFromStateForm)
I accomplished this by using the redux-form reducer plugin method.
The following demos fetching async data and pre-populating a user form with response.
const RECEIVE_USER = 'RECEIVE_USER';
// once you've received data from api dispatch action
const receiveUser = (user) => {
return {
type: RECEIVE_USER,
payload: { user }
}
}
// here is your async request to retrieve user data
const fetchUser = (id) => dispatch => {
return fetch('http://getuser.api')
.then(response => response.json())
.then(json => receiveUser(json));
}
Then in your root reducer where you include your redux-form reducer you would include your reducer plugin that overrides the forms values with the returned fetched data.
const formPluginReducer = {
form: formReducer.plugin({
// this would be the name of the form you're trying to populate
user: (state, action) => {
switch (action.type) {
case RECEIVE_USER:
return {
...state,
values: {
...state.values,
...action.payload.user
}
}
default:
return state;
}
}
})
};
const rootReducer = combineReducers({
...formPluginReducer,
...yourOtherReducers
});
Finally you include you combine your new formReducer with the other reducers in your app.
Note The following assumes that the fetched user object's keys match the names of the fields in the user form. If this is not the case you will need to perform an additional step on the data to map fields.
By default, you may only initialize a form component once via initialValues. There are two methods to reinitialize the form component with new "pristine" values:
Pass a enableReinitialize prop or reduxForm() config parameter set to true to allow the form the reinitialize with new "pristine" values every time the initialValues prop changes. To keep dirty form values when it reinitializes, you can set keepDirtyOnReinitialize to true. By default, reinitializing the form replaces all dirty values with "pristine" values.
Dispatch the INITIALIZE action (using the action creator provided by redux-form).
Referenced from : http://redux-form.com/6.1.1/examples/initializeFromState/
Could you fire the dispatch on componentWillMount(), and set the state to loading.
While it is loading, render a spinner for example and only when the request returns with the values, update the state, and then re-render the form with the values??
Here is minimal working example on how to set initialValues based on async source.
It uses initialize action creator.
All values from initialValues shouldn't be undefined, or you will get an infinite loop.
// import { Field, reduxForm, change, initialize } from 'redux-form';
async someAsyncMethod() {
// fetch data from server
await this.props.getProducts(),
// this allows to get current values of props after promises and benefits code readability
const { products } = this.props;
const initialValues = { productsField: products };
// set values as pristine to be able to detect changes
this.props.dispatch(initialize(
'myForm',
initialValues,
));
}
While this method may not be the best solution, it works well enough for my needs:
AJAX request to API on entry
Initializes form with data when request has been fulfilled or displays a server error
Resetting form will still reset to initial seed data
Allows the form to be reused for other purposes (for example, a simple if statement could bypass setting initial values): Add Post and Edit Post or Add Comment and Edit Comment...etc.
Data is removed from Redux form on exit (no reason to store new data in Redux since it's being re-rendered by a Blog component)
Form.jsx:
import React, { Component } from 'react';
import { Field, reduxForm } from 'redux-form';
import { connect } from 'react-redux';
import { browserHistory, Link } from 'react-router';
import { editPost, fetchPost } from '../../actions/BlogActions.jsx';
import NotFound from '../../components/presentational/notfound/NotFound.jsx';
import RenderAlert from '../../components/presentational/app/RenderAlert.jsx';
import Spinner from '../../components/presentational/loaders/Spinner.jsx';
// form validation checks
const validate = (values) => {
const errors = {}
if (!values.title) {
errors.title = 'Required';
}
if (!values.image) {
errors.image = 'Required';
}
if (!values.description) {
errors.description = 'Required';
} else if (values.description.length > 10000) {
errors.description = 'Error! Must be 10,000 characters or less!';
}
return errors;
}
// renders input fields
const renderInputField = ({ input, label, type, meta: { touched, error } }) => (
<div>
<label>{label}</label>
<div>
<input {...input} className="form-details complete-expand" placeholder={label} type={type}/>
{touched && error && <div className="error-handlers "><i className="fa fa-exclamation-triangle" aria-hidden="true"></i> {error}</div>}
</div>
</div>
)
// renders a text area field
const renderAreaField = ({ textarea, input, label, type, meta: { touched, error } }) => (
<div>
<label>{label}</label>
<div>
<textarea {...input} className="form-details complete-expand" placeholder={label} type={type}/>
{touched && error && <div className="error-handlers"><i className="fa fa-exclamation-triangle" aria-hidden="true"></i> {error}</div>}
</div>
</div>
)
class BlogPostForm extends Component {
constructor() {
super();
this.state = {
isLoaded: false,
requestTimeout: false,
};
}
componentDidMount() {
if (this.props.location.query.postId) {
// sets a 5 second server timeout
this.timeout = setInterval(this.timer.bind(this), 5000);
// AJAX request to API
fetchPost(this.props.location.query.postId).then((res) => {
// if data returned, seed Redux form
if (res.foundPost) this.initializeForm(res.foundPost);
// if data present, set isLoaded to true, otherwise set a server error
this.setState({
isLoaded: (res.foundPost) ? true : false,
serverError: (res.err) ? res.err : ''
});
});
}
}
componentWillUnmount() {
this.clearTimeout();
}
timer() {
this.setState({ requestTimeout: true });
this.clearTimeout();
}
clearTimeout() {
clearInterval(this.timeout);
}
// initialize Redux form from API supplied data
initializeForm(foundPost) {
const initData = {
id: foundPost._id,
title: foundPost.title,
image: foundPost.image,
imgtitle: foundPost.imgtitle,
description: foundPost.description
}
this.props.initialize(initData);
}
// onSubmit => take Redux form props and send back to server
handleFormSubmit(formProps) {
editPost(formProps).then((res) => {
if (res.err) {
this.setState({
serverError: res.err
});
} else {
browserHistory.push(/blog);
}
});
}
renderServerError() {
const { serverError } = this.state;
// if form submission returns a server error, display the error
if (serverError) return <RenderAlert errorMessage={serverError} />
}
render() {
const { handleSubmit, pristine, reset, submitting, fields: { title, image, imgtitle, description } } = this.props;
const { isLoaded, requestTimeout, serverError } = this.state;
// if data hasn't returned from AJAX request, then render a spinner
if (this.props.location.query.postId && !isLoaded) {
// if AJAX request returns an error or request has timed out, show NotFound component
if (serverError || requestTimeout) return <NotFound />
return <Spinner />
}
// if above conditions are met, clear the timeout, otherwise it'll cause the component to re-render on timer's setState function
this.clearTimeout();
return (
<div className="col-sm-12">
<div className="form-container">
<h1>Edit Form</h1>
<hr />
<form onSubmit={handleSubmit(this.handleFormSubmit.bind(this))}>
<Field name="title" type="text" component={renderInputField} label="Post Title" />
<Field name="image" type="text" component={renderInputField} label="Image URL" />
<Field name="imgtitle" component={renderInputField} label="Image Description" />
<Field name="description" component={renderAreaField} label="Description" />
<div>
<button type="submit" className="btn btn-primary partial-expand rounded" disabled={submitting}>Submit</button>
<button type="button" className="btn btn-danger partial-expand rounded f-r" disabled={ pristine || submitting } onClick={ reset }>Clear Values</button>
</div>
</form>
{ this.renderServerError() }
</div>
</div>
)
}
}
BlogPostForm = reduxForm({
form: 'BlogPostForm',
validate,
fields: ['name', 'image', 'imgtitle', 'description']
})(BlogPostForm);
export default BlogPostForm = connect(BlogPostForm);
BlogActions.jsx:
import * as app from 'axios';
const ROOT_URL = 'http://localhost:3001';
// submits Redux form data to server
export const editPost = ({ id, title, image, imgtitle, description, navTitle }) => {
return app.put(`${ROOT_URL}/post/edit/${id}?userId=${config.user}`, { id, title, image, imgtitle, description, navTitle }, config)
.then(response => {
return { success: response.data.message }
})
.catch(({ response }) => {
if(response.data.deniedAccess) {
return { err: response.data.deniedAccess }
} else {
return { err: response.data.err }
}
});
}
// fetches a single post from the server for front-end editing
export const fetchPost = (id) => {
return app.get(`${ROOT_URL}/posts/${id}`)
.then(response => {
return { foundPost: response.data.post}
})
.catch(({ response }) => {
return { err: response.data.err };
});
}
RenderAlert.jsx:
import React, { Component } from 'react';
const RenderAlert = (props) => {
const displayMessage = () => {
const { errorMessage } = props;
if (errorMessage) {
return (
<div className="callout-alert">
<p>
<i className="fa fa-exclamation-triangle" aria-hidden="true"/>
<strong>Error! </strong> { errorMessage }
</p>
</div>
);
}
}
return (
<div>
{ displayMessage() }
</div>
);
}
export default RenderAlert;
Reducers.jsx
import { routerReducer as routing } from 'react-router-redux';
import { reducer as formReducer } from 'redux-form';
import { combineReducers } from 'redux';
const rootReducer = combineReducers({
form: formReducer,
routing
});
export default rootReducer;
use this :
UpdateUserForm = reduxForm({
enableReinitialize: true,
destroyOnUnmount: false,
form: 'update_user_form' // a unique identifier for this form
})(UpdateUserForm);
UpdateUserForm = connect(
(state) => ({
initialValues: state.userManagment.userSingle
})
)(UpdateUserForm);
export default UpdateUserForm;