How do I log submissions? [closed] - html

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I just want to log submissions to like a txt that I can look at in github, I want a submission form like: Password & email, then when you click okay, it logs it into like a txt file in github, with "email:password" format.. Anyone know how to do this? I would really appreciate it!
Here is my code so far:
<div class="shopping-input input-text">
<input type="text" placeholder="Enter your Minecraft username." name="username" maxlength="16">
</div>
<div class="shopping-continue element_button">
<div class="l"></div>
<div class="r"></div>
<div class="button_block">
<a>Continue</a>
</div>
</div>

Answer 1

From your comments, it seems as though you don't have much experience with forms or web development in general.
You say you want to "log" it to a text file. This is generally not the best idea, because text files are usually easily accessible and readable to the public. It's best to use a database instead.
However, to either use a text file or a database, you're going to need a server-side language that can interact with the server (such as files). The tagged languages "HTML" and "CSS" will not help you out with the form submission — they are client-side languages that help with the formatting of the page and only interact with the user to the browser, and cannot edit files.
PHP is an example of a server-side language. You should read up about it and file IO.
Assuming you do know how to use PHP, this would be a very simple example:
HTML FILE: index.html
<form action="action.php" method="post">
Enter your name here: <input name="name" type="text" />
<input type="submit" value="Submit" />
</form>
PHP FILE: action.php
<?php
$name = $_POST["name"];
$file_to_write = fopen("name_file.txt","w+");
fwrite($file_to_write, $name);
fclose($file_to_write);
?>