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How do I submit a form's data to another function without refreshing the page?

I'm working on a collection of web apps using REACT JS. For part of the current app I'm working on, I have a modal that renders on a state change and has a form to receive a name with some related data. I want the submit button in this form to submit the code to a submitNewName() function which will compare the submitted name & data to names & data from a JSON file. Unfortunately, I cannot test to see if any of my code works because the page refreshes upon submission, which refreshes the developer console.
Within my submitNewName() function, I have the following line of code:
var newName = document.getElementById("newNameForm").submit(). I read another similar question where someone suggested adding function(e) {e.preventDefault();} as an argument for .submit, but when I tried that it didn't change anything.
Here's my form:
<form id="addNameForm" className="RNGpopupTXT">
Name: <input type="text" name="name"/>
<br/><br/>
Type: <select>
<option value="fname">First Name</option>
<option value="lname">Last Name</option>
<option value="sname">Single Name (e.g. Madonna)</option>
<option value="title">Title</option>
</select>
<br/><br/>
Gender: <select>
<option value="mg">Male</option>
<option value="fg">Female</option>
<option value="ng">Non-specific</option>
</select>
<br/><br/>
Tags: <input type="text" size="40" name="tags" placeholder=" eg. 'Star Wars,Scifi,Space'"/>
<br/><br/><br/><br/>
<div align="center">
<input type="submit" value="Submit" className="mdc-button" style={{ textDecoration: 'none' }} onClick={() => this.submitNewName()}/>
</div>
</form>
and here's my function:
submitNewName() {
var newName = document.getElementById("newNameForm").submit(function(e) {
e.preventDefault();
});
}
I would like the data from the form to be given to the function in a way that would allow it to be compared to the JSON file data. I also do not want the page to refresh, as that refreshes the state of the page, closing the modal prematurely. When I run the program now, it does send an error message to the console, but I cannot read what it says because the console is refreshed with the web page.

It feels like you could use more React to make your life easier here.
You don't have to use the form's onSubmit event. You could just add an onClick handler to the button. In that function, you could do all the comparing you want and, whrn you're ready, it can do the submitting logic too.
If you wanted to compare the form's values, you might want to keep those values in state. To do so though, you would need onChange functions on each of the form elements to update the state as the user provides input.
As I didn't see much React code in your example, I took the liberty of writing some out. Hopefully it will help you:
https://codesandbox.io/s/elastic-shape-yrv0b

Populating Inputs Based on HTML Dropdown Selection

I know there are many questions like this one on Stack Overflow, but I am really needing something more related towards what I am doing...so that is why I am posting this question.
I have an HTML form with PHP that pulls data from an MSSQL database in order to populate a dropdown box. I want to be able to populate the contact information text boxes once I select a name from my dropdown box. So far, I have it to where, if I select a specific vendor, the vendor name gets entered automatically into the Name, Email, and Phone Number fields. However, I want to have different attributes entered into the text fields and not the vendor name itself. How could I do this?
The fields from my database with the name, email, and phone number that I want imported are named MR_POC_N, MR_POC_E, and MR_POC_P
Also the "MR_Name" that you see is the field with all names of the vendors FYI
Here is my code for the HTML dropdown:
<select name="vendor_dropdown" id="ven" onChange="updateinput();">
<option value="">Choose a Vendor</option>
<?php foreach($users->fetchAll() as $user): ?>
<option><?php echo $user['MR_Name'];?></option>
<?php endforeach; ?>
</select>
Here is my Contact Info code:
<table align="center">
<tr>
<td align="right">Name:</td>
<td><input class="textbox" type="text" id="name" name="name"></td>
</tr>
<tr>
<td align="right">Email:</td>
<td><input class="textbox" type="email" id="email" name="email"></td>
</tr>
<tr>
<td align="right">Phone Number:</td>
<td><input class="textbox" type="tel" id="tel" name="number"></td>
</tr>
</table>
Here is the update input function I have in JS. I know this is off but looking for some sort of direction as I am not the best in JS:
function updateinput() {
var e = document.getElementById("ven");
var venSelected = e.options[e.selectedIndex].value;
document.getElementById("name").value=venSelected;
document.getElementById("email").value=venSelected;
document.getElementById("tel").value=venSelected;
}

Keep your script the same as it currently is but change your JavaScript and the dropdown. In your dropdown try doing
<option value = "<?=$user['MR_Name'];?>"><?php echo $user['MR_Name'];?></option>
You want to make what's called an AJAX request. This will allow you to go off to another page get some data in your case you would be getting some user information, and return it to the page, without the user physically changing page!
Check this link out for more information on AJAX.
Your AJAX call will look something like this.
function updateinput() {
var e = $("#ven").val();
$.ajax({
url: "get-user-info.php",
type: "POST",
data: {e: e},
success: function(data){
data = JSON.parse(data);
var email = data[0];
var tel = data[1];
$("#email").val(email);
$("#tel").val(tel);
}
});
}
This script first gets the selected value of the dropdown. Then it starts the make the AJAX call, it's like submitting a form, we are POSTING the values across to the next page. So the page the AJAX will talk to is get-user-info.php it's posting the values from data. The data is sending across e which is what the dropdown value is. On success it will then do the code underneath which is saying parse data from a PHP array to JavaScript and then it is saying email is the first value of the array and tel is the second value from the array. Then we are saying the input with ID 'email' now equals email from the array and the input with ID 'tel' now equals tel from the array.
You will now need to create a php script in the same directory called get-user-info.php
In this script make a call to your database where the user is the same as the selected value e and return a PHP array that looks like this:
array(email, telephone)
This is pseudo-code for your PHP script get-user-info.php:
<?php
$e = $_POST["e"];
//Do your SQL
//In the loop
$array[] = $user["email"];
$array[] = $user["tel"];
echo json_encode($array);
?>

Django - Change the route of sending a form based on dropdown

I am currently making a kind of internal search engine with multiple options in a dropdown, it works at first but I would like to change the form to get the urls based on the dropdown, so I can get:
example.com/search/**Option_Value_Here**/?q=my+query
I'm using Django as the framework
<form action="/search/" method="get">
<input name="q" id="query" value="{{ query }}" type="text" autocomplete="off">
<select id="category" name="select-name" method="get">
<option value="Jose">Jose</option>
<option value="Mike">Mike</option>
<option value="Mary_Ann">Mary Ann</option>
<option value="chaplin">Chaplin</option>
</select>
<input value="Search" class="fit" type="submit">
</form>
My question is if there is a way where I can change the path of the form action:
<form action="/search/{{ Option_Value_Here }}}/" method="get">
Thanks for your time.
Regards

You can do that with JavaScript/jQuery.
<form id="myform">
...
</form>
$(".category").change(function(){
value = $(this).val()
$('.myform').attr('action', "/search/" + value)
});
Remember to place the code in a $(document).ready() listener.
Want to avoid JavaScript?
You can get the value directly in the template. You cannot change that value if the user changes the dropdown value: in this case, your only chance is that of redirecting the user in your views.py based on what he choose in the dropdown.
Remember: Django simply renders a page and sends it to the user. Whatever happens before a new call is made to your server is not in the possibilities of Django but those of JavaScript.

How to navigate to other php pages using drop down list?

I am having trouble trying to figure out how to navigate to different web pages using a drop down list and submit. I have three forms:
main.php
two.php
three.php
In my main.php page I have a drop down list consisting of only two options 'second' and 'third'. How can I use these two options to navigate to other php pages? For example, if I selected the option 'two' and click submit, the page should then take me to the second.php page. And if I select option 'three', I will be taken to the third.php page.
Also, once I am directed to one of the php pages, how can I then be able to go back to the 'main.php' page if I decide to go to the other php page instead? (I thought perhaps the use of a back button).
Below is part of my 'main.php' page:
<label>Select the page you wish to go:</label></td>
<select name="pages"/>
<option value="two.php">Second</option>
<option value="three.php">Third</option>
</select></td>

On <select></select> value change :
HTML :
<select name="pages" onChange="my_function(this)">
JavaScript :
function my_function(element){
document.location.href = element.value
}
Example
On <button></button> click :
HTML :
<button onClick="my_function()"></button>
JavaScript :
function my_function(){
document.location.href = document.querySelector('select[name="pages"]').value
}
Example

You can do multiple things. If you dont wan't to rely on javascript, make the form submit to a file like router.php.
inside router.php put:
<?php
if (isset($_POST['pages']) {
header('Location: ' . $_POST['pages']);
}
Which will effectively forward the request to the page you submitted in the select.
You also have to change your html a bit:
<label>Select the page you wish to go:</label></td>
<form method="post" action="router.php">
<select name="pages"/>
<option value="two.php">Second</option>
<option value="three.php">Third</option>
</select>
<input type="submit" value="go there" />
</form>
If you are fine with javascript go with #notulysses's answer, its way easier and quicker.
Using POST values directly in a header method is kinda nasty imo.

Jquery solution
HTML CODE:
<form id="frm" method="post" action="" >
<label>Select the page you wish to go:</label>
<select name="pages"/>
<option value="two.php">Second</option>
<option value="three.php">Third</option>
</select>
<input type="submit" name="sub" value="Finish" />
</form>
JQUERY CODE
$('#frm').on('submit',function () {
var nextPage= $('select option:selected').val();
$(this).attr('action',nextPage);
return true;
});
Happy Coding :)

sending the elements of a select form to another one

it's my first post here and I so sorry if I wrong the place.
My difficulty is view the elements of the first select form to the other one if the first form is set as array.
The goal is to send the elements of a select form to another one and then record them on a db MySQL, that will show them on a html page.
I found in this forum the procedure how to create two select form and add 'n remove the items, then with the command .implode of MySQL can join the element and insert multiple items on db and view them on page.
But if I set the name's select form as array it doesn't work. I've used the following script to have two select form :
<script language="javascript">
function getOpt(select1,select2)
{
for (bCnt=0;bCnt<select1.length;bCnt++)
{
if (select1.options[bCnt].selected)
{
newOpt=new
Option(select1.options[bCnt].text,select1.options[bCnt].value,false,false);
select2.options[select2.length]=newOpt;
}
}
}
function remOpt(select2)
{
for (bCnt=0;bCnt<select2.length;bCnt++)
{
if (select2.options[bCnt].selected)
select2.options[bCnt]=null;
}
}
</script>
then the selects form:
<table border="0">
<tr>
<td>
<label for="id">List:<br></label>
<select name="oneS" id="select_role" size=20 required multiple="multiple"/>
<option value="101">101</option>
<option value="102">102</option>
<option value="103">103</option>
<option value="104">104</option>
<option value="105">105</option>
<option value="106">106</option>
</select>
</td>
<td>
<input type="button" value="Add"onClick="getOpt(this.form.oneS,this.for m.twoS)"><br>
<input type="button" value="Remove"onClick="remOpt(this.form.twoS)">
</td>
<td>
<label for="id">Members List:<br></label>
<select name="twoS" id="select_role" size=20 multiple="multiple"/>
</select>
</td>
</tr>
</table>
if comment the script,the part of the buttons, the second form and change the line:
<select name="oneS" id="select_role" size=20 required multiple="multiple"/>
in
<select name="oneS[]" id="select_role" size=20 required multiple="multiple"/>
I have any issue, can record the items of the first select form on db and view them on the page.
But it's not my goal, I've have to use 2 select form.
Is there some one can help me? thanks a lot.

I've you use jQuery, here it is:
$(document).ready(function()
{
$('.add').click(function(event)//this is your first form, with the id "select_role"
{
$('#select_role2).html($(this).html()+"add whatever html code you want to insert into here");
});
});
use the same idea for remove item.
then use an $.ajax or $.post to send the data to mysql or use a variable to store all the html that was added or removed from your second select.
Simply include the jQuery library and you are all sorted. I have not written raw JAvascript in a long long time, but this will work with the help of jQuery. don't use the same id for two elements again. The id must be unique.
Then assuming you insert a whole bunch of options, you can use $('#your_form_id).serialize() within an $.ajax call to get the array of elements then use the PHP technique for parsing name="insertedoption[]" />. I'm not completely sure I helped you too much, as you need to read up on a few things, but this is an idea on how to do what you need to do.