I am trying to implement a Javascript function within an HTML button. Below is the Javascript and HTML that I am using. I want the submit button to call the function with the file_name and file_data being passed into the function, but I am not exactly sure how to do this. I know there is an onClick I can use, but I don't know how to pass the information from the file input into the function.
<form method="POST">
<div align="center">
<input type="file" id="myfile" name="myfile">
</div>
<br />
<div align="center">
<button type="submit" class="btn btn-primary">Add File</button>
</div>
</form>
function uploadFile(file_name, file_data) {
fetch("/upload-file", {
method: "POST",
body: JSON.stringify({ file_name: file_name, file_data: file_data }),
}).then((_res) => {
window.location.href = "/";
});
}
Creating a handleSubmit function which gets called from the forms onSubmit='handleSubmit()'.
The form information is acquired via: Object.fromEntries((new FormData(event.target)).entries());. which is of the type object.
function handleSubmit() {
let formValues = Object.fromEntries((new FormData(event.target)).entries());
/* call any function you want! */
}
<form action="/action_page.php" onsubmit="handleSubmit()">
Enter name: <input type="text" name="fname"/>
<input type="submit" value="Submit"/>
</form>
-------- EDITED I. Following the recommendation by: isherwood, your result should look something like this:
function logSubmit(event) {
let fieldValue = form.fname.value; //gets field value
event.preventDefault();
}
const form = document.getElementById('form');
form.addEventListener('submit', logSubmit);
<form id="form">
<label>Test field: <input type="text" name="fname"></label>
<br/><br/>
<button type="submit">Submit form</button>
</form>
In HTML there is actually an Event-Listener called "onclick". Try using it on your submit button like this:
<button onclick="uploadFile(file_name, file_data)">Add File</button>