引导程序4文件输入

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)

For changing the language of the file browser:
As an alternate to what ZimSystem mentioned (override the CSS), a more elegant solution is suggested by the bootstrap docs: build your custom bootstrap styles by adding languages in SCSS
Read about it here: https://getbootstrap.com/docs/4.0/components/forms/#file-browser

Note: you need to have the lang attribute properly set in your document for this to work

For updating the value on file selection:
You could do it with inline js like this:

   <label class="custom-file">
<input type="file" id="myfile" class="custom-file-input" onchange="$(this).next().after().text($(this).val().split('\\').slice(-1)[0])">
<span class="custom-file-control"></span>
</label>

Note: the .split('\\').slice(-1)[0] part removes the C:\fakepath\ prefix

I just solved it this way

Html:

<div class="custom-file">
<input id="logo" type="file" class="custom-file-input">
<label for="logo" class="custom-file-label text-truncate">Choose file...</label>
</div>

JS:

$('.custom-file-input').on('change', function() {
let fileName = $(this).val().split('\\').pop();
$(this).next('.custom-file-label').addClass("selected").html(fileName);
});

Note: Thanks to ajax333221 for mentioning the .text-truncate class that will hide the overflow within label if the selected file name is too long.

 <!doctype html>
<html lang="en">
<head>
<!-- Required meta tags -->
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">


<!-- Bootstrap CSS -->
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" integrity="sha384-WskhaSGFgHYWDcbwN70/dfYBj47jz9qbsMId/iRN3ewGhXQFZCSftd1LZCfmhktB" crossorigin="anonymous">


<title>Hello, world!</title>
</head>
<body>
<h1>Hello, world!</h1>
<div class="custom-file">
<input type="file" class="custom-file-input" id="inputGroupFile01">
<label class="custom-file-label" for="inputGroupFile01">Choose file</label>
</div>
<!-- Optional JavaScript -->
<!-- jQuery first, then Popper.js, then Bootstrap JS -->
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js" integrity="sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvCWPIPm49" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js" integrity="sha384-smHYKdLADwkXOn1EmN1qk/HfnUcbVRZyYmZ4qpPea6sjB/pTJ0euyQp0Mk8ck+5T" crossorigin="anonymous"></script>
<script>
$(function() {
$(document).on('change', ':file', function() {var input = $(this), numFiles = input.get(0).files ? input.get(0).files.length : 1,
label = input.val().replace(/\\/g, '/').replace(/.*\//, '');input.trigger('fileselect', [numFiles, label]);
});
$(document).ready( function() {
$(':file').on('fileselect', function(event, numFiles, label) {var input = $(this).parents('.custom-file').find('.custom-file-label'),
log = numFiles > 1 ? numFiles + ' files selected' : label;if( input.length ) {input.text(log);} else {if( log ) alert(log);}});
});
});
</script>
</body>
</html>

Solution based on @Elnoor answer, but working with multiple file upload form input and without the "fakepath hack":

HTML:

<div class="custom-file">
<input id="logo" type="file" class="custom-file-input" multiple>
<label for="logo" class="custom-file-label text-truncate">Choose file...</label>
</div>

JS:

$('input[type="file"]').on('change', function () {
let filenames = [];
let files = document.getElementById('health_claim_file_form_files').files;


for (let i in files) {
if (files.hasOwnProperty(i)) {
filenames.push(files[i].name);
}
}


$(this).next('.custom-file-label').addClass("selected").html(filenames.join(',    '));
});

As of Bootstrap 4.3 you can change placeholder and button text inside the label tag:

<link href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" rel="stylesheet" />


<div class="custom-file">
<input type="file" class="custom-file-input" id="exampleInputFile">
<label class="custom-file-label" for="exampleInputFile" data-browse="{Your button text}">{Your placeholder text}</label>
</div>

I just add this in my CSS file and it works:

.custom-file-label::after{content: 'New Text Button' !important;}

Bootstrap 4

More details are here https://learncodeweb.com/snippets/browse-button-in-bootstrap-4-with-select-image-preview/

Today I need to create a browse button with a multi-upload files option all the above snippets are not good for me.

The official Bootstrap example is also not working when I select multiple files.

I come up with this code maybe will help others in the future.

$(document).ready(function() {
$('input[type="file"]').on("change", function() {
let filenames = [];
let files = document.getElementById("customFile").files;
if (files.length > 1) {
filenames.push("Total Files (" + files.length + ")");
} else {
for (let i in files) {
if (files.hasOwnProperty(i)) {
filenames.push(files[i].name);
}
}
}
$(this)
.next(".custom-file-label")
.html(filenames.join(","));
});
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<link href="https://cdn.jsdelivr.net/npm/bootstrap@4.6.0/dist/css/bootstrap.min.css" rel="stylesheet"/>
<div class="container mt-5">
<h1 class="text-center">Bootstrap 4 Upload multiple files</h1>
<div class="col-sm-6 mr-auto ml-auto border p-4">
<form method="post" enctype="multipart/form-data" action="upload.php">
<div class="form-group">
<label><strong>Upload Files</strong></label>
<div class="custom-file">
<input type="file" name="files[]" multiple class="custom-file-input form-control" id="customFile">
<label class="custom-file-label" for="customFile">Choose file</label>
</div>
</div>
<div class="form-group">
<button type="submit" name="upload" value="upload" id="upload" class="btn btn-block btn-dark"><i class="fa fa-fw fa-upload"></i> Upload</button>
</div>
</form>
</div>
</div>

The working code example is given here with bootstrap 3 and bootstrap 4.3.1.

https://codepen.io/mianzaid/pen/GeEbYV

Without JQuery

HTML:

<INPUT type="file" class="custom-file-input"  onchange="return onChangeFileInput(this);">

JS:

function onChangeFileInput(elem){
var sibling = elem.nextSibling.nextSibling;
sibling.innerHTML=elem.value;
return true;
}

KliG

With the help of jquery, it can be done like this. Code:

$("input.custom-file-input").on("change",function(){if(this.files.length){var filename=this.file[0].name;if(filename.length>23){filename=filename.substr(0,11)+"..."+filename.substr(-10);}$(this).siblings(".custom-file-label").text(filename);}});

In case, if you need a no jquery solution

<label class="custom-file">
<input type="file" id="myfile" class="custom-file-input" onchange="this.nextElementSibling.innerText = this.files[0].name">
<span class="custom-file-control"></span>
</label>

You can try below given snippet to display the selected file name from the file input type.

document.querySelectorAll('input[type=file]').forEach( input => {
input.addEventListener('change', e => {
e.target.nextElementSibling.innerText = input.files[0].name;
});
});

Here is the answer with blue box-shadow,border,outline removed with file name fix in custom-file input of bootstrap appear on choose filename and if you not choose any file then show No file chosen.

    $(document).on('change', 'input[type="file"]', function (event) {
var filename = $(this).val();
if (filename == undefined || filename == ""){
$(this).next('.custom-file-label').html('No file chosen');
}
else
{ $(this).next('.custom-file-label').html(event.target.files[0].name); }
});

    input[type=file]:focus,.custom-file-input:focus~.custom-file-label {
outline:none!important;
border-color: transparent;
box-shadow: none!important;
}
.custom-file,
.custom-file-label,
.custom-file-input {
cursor: pointer;
}

    <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<link href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css" rel="stylesheet"/>
<div class="container py-5">
<div class="input-group mb-3">
<div class="input-group-prepend">
<span class="input-group-text">Upload</span>
</div>
<div class="custom-file">
<input type="file" class="custom-file-input" id="inputGroupFile01">
<label class="custom-file-label" for="inputGroupFile01">Choose file</label>
</div>
</div>
</div>

Bootstrap 4.4:

Show a choose file bar. After a file is chosen show the file name along with its extension

<div class="custom-file">
<input type="file" class="custom-file-input" id="idEditUploadVideo"
onchange="$('#idFileName').html(this.files[0].name)">
<label class="custom-file-label" id="idFileName" for="idEditUploadVideo">Choose file</label>
</div>

For Bootstrap v.5

document.querySelectorAll('.form-file-input')
.forEach(el => el.addEventListener('change', e => e.target.parentElement.querySelector('.form-file-text').innerText = e.target.files[0].name));

Affect all file input element. No need to specify elements id.

In case you want to use it globally on all custom inputs use following jQuery code:

$(document).ready(function () {
$('.custom-file-input').on('change', function (e) {
e.target.nextElementSibling.innerHTML = e.target.files[0].name;
});
});

For "bootstrap_4_layout.html.twig":

document.querySelector('.custom-file-input').addEventListener('change',function(e){
this.nextElementSibling.innerText = this.files[0].name;
});