How to Create Custom events in Svelte.js
In this post we will give you information about How to Create Custom events in Svelte.js. Hear we will give you detail about How to Create Custom events in Svelte.jsAnd how to use it also give you demo for it if it is necessary.
we are going to learn about how to create and use custom events in svelte.
Custom events
Custom events help us to communicate to parent components from child components.
Creating a Custom event
Let’s create our first custom event by importing the createEventDispatcher from the ‘svelte’.
<script> import { createEventDispatcher } from "svelte"; export let name; let dispatch = createEventDispatcher(); function myCustom() { dispatch("changename"); }</script><div> <h1>{name}</h1> <!-- dispatching the custom event 'changename' --> <button on:click={myCustom}>Change Name</button></div>In the above component, we created our custom event called changename and dispatching the event by clicking a button.
Listening Custom event
To listen for the custom event we need to use on: directive.
<script> import Name from "./Name.svelte"; let framework = "svelte"; function handleChange(){ framework = "react" }</script><div> <!-- listening the custom event --> <Name on:changename={handleChange} name={framework} /></div>How to pass arguments to custom events?
We can also pass arguments to the custom events and access it from the parent component.
Let’s add an argument to our changename custom event.
<script> import { createEventDispatcher } from "svelte"; export let name; let dispatch = createEventDispatcher(); function myCustom() { dispatch("changename", { name: "Angular" //passing argument }); }</script><div> <h1>{name}</h1> <button on:click={myCustom}>Change Name</button></div>To access the argument inside the parent component we need to use event object.
<script> import Name from "./Name.svelte"; let framework = "svelte"; function handleChange(event) { //accessing the argument framework = event.detail.name; }</script><div> <!-- listening the custom event --> <Name on:changename={handleChange} name={framework} /></div>Hope this code and post will helped you for implement How to Create Custom events in Svelte.js. if you need any help or any feedback give it in comment section or you have good idea about this post you can give it comment section. Your comment will help us for help you more and improve us. we will give you this type of more interesting post in featured also so, For more interesting post and code Keep reading our blogs
PHP - I Can't get the $_POST Values on Ajax Request
In this post we will give you information about PHP - I Can't get the $_POST Values on Ajax Request. Hear we will give you detail about PHP - I Can't get the $_POST Values on Ajax RequestAnd how to use it also give you demo for it if it is necessary.
I want to share this posts with you because when i was working on native PHP and Ajax Post request(Specially AngularJS Post request) at that time i can't get Post value on form submit. That's why i would like to share you this post. I also want to tell you i was working on my Ubuntu 14.04. I did try lot but i can't get value.
At last find stuff to how to solve this issue, i did use "file_get_contents('php://input')" that way i could get POST value in json object and i also decode json value using "json_decode()". So let's try this way :
Example:
$post = file_get_contents('php://input');
$post = json_decode($post);
$sql = "INSERT INTO items (title) VALUES ('".$post->title."')";
$result = $mysqli->query($sql);
Hope this code and post will helped you for implement PHP - I Can't get the $_POST Values on Ajax Request. if you need any help or any feedback give it in comment section or you have good idea about this post you can give it comment section. Your comment will help us for help you more and improve us. we will give you this type of more interesting post in featured also so, For more interesting post and code Keep reading our blogs