Bootstrap 4 File Input

Updated 2021

Bootstrap 5

Custom file input no longer exists so to change Choose file... you'd need to use JS or some CSS like this.

Bootstrap 4.4

Displaying the selected filename can also be done with plain JavaScript. Here's an example that assumes the standard custom-file-input with label that is the next sibling element to the input...

document.querySelector('.custom-file-input').addEventListener('change',function(e){
  var fileName = document.getElementById("myInput").files[0].name;
  var nextSibling = e.target.nextElementSibling
  nextSibling.innerText = fileName
})

https://codeply.com/p/LtpNZllird

Bootstrap 4.1+

Now in Bootstrap 4.1 the "Choose file..." placeholder text is set in the custom-file-label:

<div class="custom-file" id="customFile" lang="es">
        <input type="file" class="custom-file-input" id="exampleInputFile" aria-describedby="fileHelp">
        <label class="custom-file-label" for="exampleInputFile">
           Select file...
        </label>
</div>

Changing the "Browse" button text requires a little extra CSS or SASS. Also notice how language translation works using the lang="" attribute.

.custom-file-input ~ .custom-file-label::after {
    content: "Button Text";
}

https://codeply.com/go/gnVCj66Efp (CSS)

https://codeply.com/go/2Mo9OrokBQ (SASS)

Another Bootstrap 4.1 Option

Alternatively you can use this custom file input plugin

https://www.codeply.com/go/uGJOpHUd8L/file-input

Bootstrap 4 Alpha 6 (Original Answer)

I think there are 2 separate issues here..

<label class="custom-file" id="customFile">
        <input type="file" class="custom-file-input">
        <span class="custom-file-control form-control-file"></span>
</label>

1 - How the change the initial placeholder and button text

In Bootstrap 4, the initial placeholder value is set on the custom-file-control with a CSS pseudo ::after element based on the HTML language. The initial file button (which isn't really a button but looks like one) is set with a CSS pseudo ::before element. These values can be overridden with CSS..

#customFile .custom-file-control:lang(en)::after {
  content: "Select file...";
}

#customFile .custom-file-control:lang(en)::before {
  content: "Click me";
}

2 - How to get the selected filename value, and update the input to show the value.

Once a file is selected, the value can be obtained using JavaScript/jQuery.

$('.custom-file-input').on('change',function(){
    var fileName = $(this).val();
})

However, since the placeholder text for the input is a pseudo element, there's no easy way to manipulate this with Js/jQuery. You can however, have a another CSS class that hides the pseudo content once the file is selected...

.custom-file-control.selected:lang(en)::after {
  content: "" !important;
}

Use jQuery to toggle the .selected class on the .custom-file-control once the file is selected. This will hide the initial placeholder value. Then put the filename value in the .form-control-file span...

$('.custom-file-input').on('change',function(){
  var fileName = $(this).val();
  $(this).next('.form-control-file').addClass("selected").html(fileName);
})

You can then handle the file upload or re-selection as needed.

Demo on Codeply (alpha 6)

Input type file and button of different size in Bootstrap 4 html

You need to use .input-group.input-group-lg as shown in the docs:
https://getbootstrap.com/docs/4.6/components/input-group/#sizing

EDIT:

That will not work with a .custom-file-input within the .input-group.

You will need to override the BS styles on .custom-file-label as shown below:

.input-group-lg .custom-file-label {
  font-size: 1.4rem;
  margin: 0;
}

<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@4.6.1/dist/css/bootstrap.min.css" integrity="sha384-zCbKRCUGaJDkqS1kPbPd7TveP5iyJE0EjAuZQTgFLD2ylzuqKfdKlfG/eSrtxUkn" crossorigin="anonymous">

<form>
  <div class="input-group input-group-lg">
    <div class="custom-file">
      <input type="file" class="custom-file-input" id="customFileInput" accept=".csv" aria-describedby="customFileInput">
      <label class="custom-file-label" for="customFileInput">Select File</label>
    </div>
    <div class="input-group-append">
      <button class="btn btn-success" type="button" id="uploadBtn" onclick="OnClickUpload()">Upload</button>
    </div>
  </div>
</form>

Translating custom-file input Bootstrap 4

It's because Bootstrap SASS isn't imported into the Codepen. You first need to @import "bootstrap/functions" (since that's where $custom-file-text() lives), make the changes, and finally @import "bootstrap"....

@import "bootstrap/functions";

$custom-file-text: (
  en: "Browse",
  es: "Elegir"
);

@import "bootstrap";

I don't know of way to import the Bootstrap SASS into Codepen, but here's a working example on Codeply: https://www.codeply.com/go/2Mo9OrokBQ

Related question:

Bootstrap 4 File Input

Bootstrap 4 / jQuery - Clear filename in input field <input type='file' /> bs-custom-file-input

There is no value to clear, the plugin generate a label for the custom-file what you see is not the input but the label, if you use your browser inspection you can see it, replace this :

// Clear the value
$('#customFile').val('');

by this :

// Clear the value, replace it by whatever text you want
$('#customFile').next('label').html('Select a file');

How to change the Browse button in Bootstrap custom file input?

override on css:

.custom-file-input:lang(en)~.custom-file-label::after {
    content: "Browse";
}

change content

bootstrap 4 file input doesn't show the file name

You need to use javascript to show the name of the choosed file, as written in the documentation: https://getbootstrap.com/docs/4.5/components/forms/#file-browser

Here you can find the solution: Bootstrap 4 File Input

That's the code for your example:

<html lang="en">
    <head>
        <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css" integrity="sha384-rwoIResjU2yc3z8GV/NPeZWAv56rSmLldC3R/AZzGRnGxQQKnKkoFVhFQhNUwEyJ" crossorigin="anonymous">
        <script src="https://code.jquery.com/jquery-3.1.1.slim.min.js" integrity="sha384-A7FZj7v+d/sdmMqp/nOQwliLvUsJfDHW+k9Omg/a/EheAdgtzNs3hpfag6Ed950n" crossorigin="anonymous"></script>
        <script src="https://cdnjs.cloudflare.com/ajax/libs/tether/1.4.0/js/tether.min.js" integrity="sha384-DztdAPBWPRXSA/3eYEEUWrWCy7G5KFbe8fFjk5JAIxUYHKkDx6Qin1DkWx51bBrb" crossorigin="anonymous"></script>
        <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/js/bootstrap.min.js" integrity="sha384-vBWWzlZJ8ea9aCX4pEW3rVHjgjt7zpkNpZk+02D9phzyeVkE+jo0ieGizqPLForn" crossorigin="anonymous"></script>
    </head>
    <body>
        <div class="input-group mb-3">
            <div class="custom-file">
                <input type="file" class="custom-file-input" id="inputGroupFile02"/>
                <label class="custom-file-label" for="inputGroupFile02">Choose file</label>
            </div>
            <div class="input-group-append">
                <button class="btn btn-primary">Upload</button>
            </div>
        </div>
        <script>
            $('#inputGroupFile02').on('change',function(){
                //get the file name
                var fileName = $(this).val();
                //replace the "Choose a file" label
                $(this).next('.custom-file-label').html(fileName);
            })
        </script>
    </body>
</html>

Bootstrap 4 right to left custom file input

You would need a little custom CSS like this...

.custom-file-label::after {
    left: 0;
    right: auto;
    border-left-width: 0;
    border-right: inherit;
}

Demo: https://www.codeply.com/go/kOURGBHqEX

Bootstrap 4 File Input Label Oveflows Column

You need to separate your col-sm-9 and custom-file divs.

<div class="col-sm-9">
    <div class="custom-file">
        <input type="file" class="custom-file-input form-control" id="image-upload" required>
        <label class="custom-file-label" for="image-upload">Choose file...</label>
        <div class="invalid-feedback">Example invalid custom file feedback</div>
    </div>
</div>

https://jsfiddle.net/qdfy91r5/1/

In addition, if you use the m-0 solution, it destroys your margins around every row. That answer only shows it in a one-row scenario, but you have multiple rows, which will squish them all together, as seen in the following fiddle that compares my answer to his:

https://jsfiddle.net/qdfy91r5/2/

custom-file-input label not shown in bootstrap 4

I just write a basic bootstrap 4 custom file label code, I hope it'll help you out. Thanks

<!-- Bootstrap CSS --><link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
<label class="w-100">label 1  <div class="custom-file">    <input type="file" class="custom-file-input">    <label class="custom-file-label">label 2</label>  </div></label>

Bootstrap 4 File Input

Bootstrap 4 File Input

Input type file and button of different size in Bootstrap 4 html

EDIT:

Translating custom-file input Bootstrap 4

Bootstrap 4 / jQuery - Clear filename in input field <input type='file' /> bs-custom-file-input

How to change the Browse button in Bootstrap custom file input?

bootstrap 4 file input doesn't show the file name

Bootstrap 4 right to left custom file input

Bootstrap 4 File Input Label Oveflows Column

custom-file-input label not shown in bootstrap 4

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