I've built a login component with the below code for users to log in the backend is flask and is using flask_login.
const LoginScreen = {
template: `
<div>
<h1>Sign In</h1>
<form id="loginform" class="pure-form">
<fieldset>
<input type="text" name="email" placeholder="email" v-model="logindetails.email"/>
<input type="password" name="password" placeholder="password" v-model="logindetails.password"/>
<button class="pure-button pure-button-primary" v-on:click="login">Login</button>
</fieldset>
</form>
</div>
`,
data: function () {
return {
logindetails:{}
}
},
methods: {
login: function(){
axios.post('/login/',
this.logindetails,
{
headers: {
'Content-type': 'application/json',
'Accept': 'application/json',
'X-CSRF-TOKEN': document.querySelector('#csrftoken').getAttribute('content')
}
}
).then(response => { this.logindetails = {};
this.$router.push({path: '/'});
}
)
.catch(function (error) {
console.log(error);
});
}
}
};
It seems to work correctly (though there are times when it asks me to log in again for seemingly no reason), however the component is putting the submitted form details into the querystring of the url ( example ).
Would anyone be able to tell me what I am doing wrong or, if I am doing this totally incorrectly, point me in the direction of a codebase/guide that is doing logins correctly?
Many thanks in advance.
Take a look at Vue v-on event modifiers to modify the default element behavior.
In your case you can do:
<button #click.prevent="login">Login</button>
Or in the form tag (ensure your submit button is type "submit"):
<form #submit.prevent="login">
with regards to the component is putting the submitted form details into the querystring of the url, the reason is that clicking on the button also trigger submit on the form.
HTML form submits form values to the server.
But normally in JS frameworks like Vue or React, form values are submited through ajax, without any page refresh. So using <form> has not much value here.
2 things you could do in this case
Remove <form> element. it should still works corectly
handle the form submit event.
For e.g.
<form #submit="handleSubmit($event)">
methods: {
handleSubmit:(e) =>{
e.preventDefault();
}
}
Related
I am using this form.
<form action="http://localhost:3000/">
<input type="text"
id="url"
name="url"
v-model="url"
placeholder="http://">
<input type="text" id="message" name="message" value="888">
<button #click="submit" :disabled="disabled">Go</button>
</form>
Until now, pressing a button resulted in http:localhost:300?url=...&message=... page being fetched.
Now I am trying to manually override this, so I added e.preventDefault(); to the submit() function. Now I can call Fetch API to fetch this URL manually, but how to I construct the URL from the form?
All online sources show how to do it with POST, no one seems to cover GET. Not sure why, because I need an idempotent request. Is there a standard way of doing this?
You're using Vue so typically you'd use something like this
<template>
<form #submit.prevent="submit">
<input
type="text"
v-model="url"
placeholder="http://"
/>
<input
type="text"
v-model="message"
/>
<button type="submit" :disabled="disabled">Go</button>
</form>
</template>
Notes:
The <button> is a submit button without a click handler. This lets you listen for submit events on the <form> which can be triggered by mouse click or keyboard.
The #submit.prevent handles the submit event on the <form> and prevents the default action automatically
All <input> fields have an associated v-model backing a data property
Here's an example of the <script> part
const target = "http://localhost:3000/";
export default {
data: () => ({
url: "",
message: "888",
}),
computed: {
// just an example
disabled: ({ url, message }) => url.length === 0 || message.length === 0,
},
methods: {
async submit() {
const params = new URLSearchParams({
url: this.url,
message: this.message
});
const res = await fetch(`${target}?${params}`);
},
},
};
In regular JS, you can still listen for submit events on the form, capture all the fields using FormData and turn that into a query string with URLSearchParams
document.querySelector("form").addEventListener("submit", async (e) => {
e.preventDefault();
const data = new FormData(e.target);
const params = new URLSearchParams(data);
const res = await fetch(`${e.target.action}?${params}`)
});
I am trying to make a post request to the server and do something with the response. Things seem to work on the server-side. The problem is that the page reloads upon completion of the response and I cannot do anything with the response.
The common suggestions are using button or preventDefault. These suggestions do not solve the problem: as you can see below, the input type is button (not submit) and preventDefault() on the event does not work.
Does anyone have an idea about what I am missing?
<form id="modelCodeForm">
<label for="codehere"></label>
<div id="modelAreaDiv">
<textarea id="modelArea" cols="60" rows="20">
stuff
</textarea>
<br>
<input id="submitUserModel" type="button" value="run on server">
</div>
</form>
function initializeUserModel(){
let model = document.getElementById("modelArea").value;
fetch('http://localhost:8080/', {
method: 'post',
headers: {'Content-Type': 'text/plain'},
body: model
})
.then(response => response.json())
.then(data => {
console.log(data);
}).then(console.log("received!"))
}
I got to the bottom of this. It turns out that the problem was due to VS Live Server which was detecting a change in the folder and hot-loading the app. The change was due to the backend, in the same folder, saving a log. Really silly thing to miss...
If you want to trigger your function when the form is submitted then you can use the "onsubmit" event listener available on HTML forms.
So you would do onsubmit="initializeUserModel(event)". You pass it the event object so you can call event.preventDefault() in the function and stop the page from reloading.
Change your input to type="submit" (or make it a button of type="submit") or the form submission won't be triggered.
<form id="modelCodeForm" onsubmit="initializeUserModel(event)">
<label for="codehere"></label>
<div id="modelAreaDiv">
<textarea id="modelArea" cols="60" rows="20">Stuff</textarea>
<br />
<input id="submitUserModel" type="submit" value="run on server" />
</div>
</form>
function initializeUserModel(event) {
event.preventDefault();
let model = document.getElementById("modelArea").value;
fetch("http://localhost:8080/", {
method: "post",
headers: { "Content-Type": "text/plain" },
body: model,
})
.then((response) => response.json())
.then((data) => {
console.log(data);
})
.then(console.log("received!"));
}
When I authenticate to Laravel Passport backend with Nuxt.js like below, it works and I get a token:
mounted() {
this.axiosGetToken()
}
But, if I run the method with a button in a form, like this:
<form #submit="axiosGetToken()">
<button type="submit">Axios login</button>
</form>
Then, I get the status (canceled) for the Laravel page in the Network tab of my browser developer's tool.
The method looks like this:
axiosGetToken() {
const url = 'http://laravel.test/oauth/token'
const params = {
client_id: 2,
client_secret: 'S0gpcgfIDgbvIHCL3jIhSICAiTsTUMOR0k5mdaCi',
grant_type: 'password',
username: 'me#home.com',
password: '1qaz#WSX'
}
const headers = {
}
this.$axios
.post(url, params, headers)
.then(response => {
// eslint-disable-next-line
console.log(response)
})
.catch(response => {
// eslint-disable-next-line
console.log(response)
})
},
What's wrong with this form ?
You should add prevent modifier :
<form #submit.prevent="axiosGetToken()">
<button type="submit">Axios login</button>
</form>
by default the submit event try to reload the page and searching an action from the back-end in order to run it, so the prevent modifier will prevent the action and allows the running of the js event handler.
As mentioned above, if you use a form with a button of type="submit", when pressing that button, it will use the default client behavior and send a request to the form action URL, adding a prevent will stop that behavior.
Although it is a valid answer, I would suggest adding a #click="axiosGetToken()" on the button.
<form>
<button type="button" #click="axiosGetToken()">Axios login</button>
</form>
as the title says, I want to submit a form and update the values from the form (Mysql result) without refreshing the whole page.
See Image 1, I want if I press the blue button that the values updated.
Can someone help me?
Thanks.
If you are willing to use newer apis like Promise and fetch, it's super easy and neat.
foo.submit.addEventListener("click", (e) => {
e.preventDefault();
fetch("YOUR_URL", {
method: 'POST',
body: new URLSearchParams({
name: foo.user_name_value,
email: foo.user_mail.value
})
}).then(response => {
return response.json() // assume returning data is in json format, otherwise .text() could be used
}).then(data => {
// deal with return data
}).catch(err => {
// deals with errors
})
})
<form name="foo">
<div>
<label for="name">Name:</label>
<input type="text" id="name" name="user_name">
</div>
<div>
<label for="mail">E-mail:</label>
<input type="email" id="mail" name="user_mail">
</div>
<div>
<button name="submit" type="submit">Send your message</button>
</div>
</form>
Older method XHR shares same idea, but requires a bit more code. You may use axios or so to simplify the process.
I am trying to call a rest api from my login page on click of a button. I am using $.ajax to do so. The POST request gets sent and 200 code is also showing on backend. But in my browser network tab it shows failed. I don't know what is wrong. I am trying to print the response in the console when response comes from api, but nothing get printed. That means api is getting the POST req, it is generating a token for me and sending it to me but my client side is failing to get the response. Here is my code and essential screenshots. P.S. I don't get any error in console.
import React, {Component} from 'react'
import {Router, Route, browserHistory, IndexRoute} from "react-router"
require("./login.css")
import valueLink from 'valuelink'
import $ from 'jquery'
export default class LogInComponent extends Component {
handleLoginButtonClick() {
var settings = {
"async": true,
"crossDomain": true,
"url": "https://******appspot.com/auth/login/",
"method": "POST",
"credentials": 'include',
"headers": {
"content-type": "application/x-www-form-urlencoded",
},
"data": {
"password": "****",
"username": "****"
}
}
$.ajax(settings).done(function () {
alert("success");
});
}
render(){
return (
<div className="LoginPage">
<div className="login-page">
<div className="form">
<form className="login-form">
<input id="username" type="username" placeholder="username"/>
<input id="password" type="password" placeholder="password"/>
<button onClick={this.handleLoginButtonClick}>login</button>
<p className="message">Not registered? Request Username and Password</p>
</form>
</div>
</div>
</div>
);
}
}
This is my network tab
This is when I click :3000... from initiator column. The highlighted line is where it takes me.
Your button submits the form when clicked because the default type for the button element is submit. This happens even when you give it your own click handler. The form submit basically just reloads your page since the form lacks the action-attribute, so it reloads during your ajax request, which cancels it (as you can see from your network tab). You have several ways to solve this.
You can add type="button" to the button element:
<button type="button" onClick={this.handleLoginButtonClick}>login</button>
You can cancel the default native event handling in the onClick handler:
handleLoginButtonClick(event) {
event.preventDefault();
...
}
You can use an onSubmit handler on the form element, instead of an onClick handler on the button:
<form className="login-form" onSubmit={this.handleLoginFormSubmit}>
...
</form>
with
handleLoginFormSubmit(event){
event.preventDefault(); // Stop form from submitting
...
}