Open Select File Dialog Box Using JavaScript

Open Select File Dialog Box Using JavaScript

In this tutorial we will see how to Open Select File Dialog Box Using JavaScript. The HTML DOM click() Method is used for this which will open select file box when normal HTML button is clicked.

HTML Code

HTML Code is given below, This code contains an input element and a button element.

       Select File   

.click() Method

The HTML DOM click() Method is used to simulate the mouse click for the selected HTML element.

The click method will execute a click for an element as if the user has actually clicked on that element.

It is supported by all major browsers.

getElementById() Method

The getElementById() Method is used to get or select or target the HTML element with a specified value of Id attribute.

In this example the id of input element is ‘file’. This id is used to target the input element.

It is also supported by all major browsers.

JavaScript Code

In this example onclick event will trigger the main function when button is clicked. The main function will then select the input element using getElementById method and it will open the select file dialog box using the .click() method.

Take a look at the code given below.

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How to create a custom file upload button

I find the default HTML file upload button rather ugly. Annoying enough, there seems to be no way to style it directly. Here is how I created a custom file upload button.

1. Use a label tag and point its for attribute to the id of the default HTML file upload button

  type="file" id="actual-btn"/>  for="actual-btn">Choose File 

By doing this, clicking the label element in the browser toggles the default HTML file upload button (as though we clicked it directly). The output of the above code is below. As you can see, we only have a Choose File text (from the label element) a few pixels to the right of the actual upload button. We can click the Choose File text, and it will toggle the upload window (Click it and see)

2. Style the label element and hide the default HTML file upload button

We hide the default HTML file upload button in the browser by adding the hidden attribute to the tag like so

 type="file" id="actual-btn" hidden/> 

label  background-color: indigo; color: white; padding: 0.5rem; font-family: sans-serif; border-radius: 0.3rem; cursor: pointer; margin-top: 1rem; > 

Now we have this beautiful custom button, which actually works like the original file upload button: At this point, we are done. But there is one more glitch to fix. With the default file upload button, there is a no file chosen text beside the button (scroll up to the first codepen window), which gets replaced with the name of the file we will be uploading. Unfortunately, we don’t get to see that with our custom button. How do we do that? What I did was to include a span tag (with an id of file-chosen) right after our custom file upload button. In the javascript file, I listen to the change event on the original file upload button(which we have hidden). A file object is returned which contains the details(such as name, file size etc) of the file uploaded. Then I set the text content of the span element(with the id of file-chosen) to the name property of the file object returned. The final result is below. Test it out. Kindly leave your comments and questions down below

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Open Select File Dialog Box Using JavaScript

In this tutorial we will see how to Open Select File Dialog Box Using JavaScript. The HTML DOM click() Method is used for this which will open select file box when normal HTML button is clicked.

HTML Code

HTML Code is given below, This code contains an input element and a button element.

       Select File   

.click() Method

The HTML DOM click() Method is used to simulate the mouse click for the selected HTML element.

The click method will execute a click for an element as if the user has actually clicked on that element.

It is supported by all major browsers.

getElementById() Method

The getElementById() Method is used to get or select or target the HTML element with a specified value of Id attribute.

In this example the id of input element is ‘file’. This id is used to target the input element.

It is also supported by all major browsers.

JavaScript Code

In this example onclick event will trigger the main function when button is clicked. The main function will then select the input element using getElementById method and it will open the select file dialog box using the .click() method.

Take a look at the code given below.

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Open file with button html

Last updated: Jan 17, 2023
Reading time · 2 min

# Open a file input box on button click in React

To open a file input box on button click in React:

1. Set the onClick prop on a button element.
2. Set the ref prop on the file input.
3. When the button gets clicked, open the file input box, e.g. inputRef.current.click() .

Copied! 
import useRef> from 'react'; const App = () =>  const inputRef = useRef(null); const handleClick = () =>  // 👇️ open file input box on click of another element inputRef.current.click(); >; const handleFileChange = event =>  const fileObj = event.target.files && event.target.files[0]; if (!fileObj)  return; > console.log('fileObj is', fileObj); // 👇️ reset file input event.target.value = null; // 👇️ is now empty console.log(event.target.files); // 👇️ can still access file object here console.log(fileObj); console.log(fileObj.name); >; return ( div> input style=display: 'none'>> ref=inputRef> type="file" onChange=handleFileChange> /> button onClick=handleClick>>Open file upload boxbutton> div> ); >; export default App; 

We used the useRef hook to get access to the file input element.

Copied! 
input ref=inputRef> style=display: 'none'>> type="file" onChange=handleFileChange> /> 

Notice that we have to access the current property on the ref object to get access to the file input element on which we set the ref prop.

Copied! 
const handleClick = () =>  // 👇️ open file input box on click of other element inputRef.current.click(); >; 

When we pass a ref prop to an element, e.g./> , React sets the .current property of the ref object to the corresponding DOM node.

We can call the click() method, e.g. ref.current.click() to simulate a mouse click on the file input element.

When the click() method is used on an element, it triggers the element’s click event. When the click event on a file input is triggered, the file upload dialog opens.

Notice that we set the display property of the file input to none to hide it.

Copied! 
input ref=inputRef> style=display: 'none'>> type="file" onChange=handleFileChange> /> 

Now when the user clicks on the button element, we simulate a click on the file input using the ref object and the file upload box opens.

This approach works with any type of element, e.g. a div or an icon.

Simply set the onClick prop on the element and simulate a click on the file input when the element gets clicked.

If you need to reset a file input in React, click on the link and follow the instructions.

If you need to handle a double-click event in React, check out the following article.

I wrote a book in which I share everything I know about how to become a better, more efficient programmer.

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JavaScript Open File Dialog

Ever since the type=»file» attribute was introduced in JavaScript, the task of opening a file dialog became effortless. We will discuss the type=»file» attribute in HTML in this article.

Use the type=»file» Attribute in HTML and onchange Method in JavaScript to Open File Dialog

We will create a button element in the following instance, and an onclick attribute will follow this. This will trigger a function in the JavaScript file.

The JavaScript file will have the corresponding function to create an input element with a type=file . Specifically, this is the segment where we will open the file dialog to enter the preferable file.

 html lang="en"> head>  meta charset="UTF-8">  title>Documenttitle>  head> body>  button onclick="importD()">Databutton>  script src="okay.js">script>  body>  html> 

function importD()   let input = document.createElement('input');  input.type = 'file';  input.onchange = _this =>   let files = Array.from(input.files);  console.log(files);  >;  input.click();  > 

As seen above, whenever the Data button will receive a click, it will open up the file dialog, and any file uploaded is previewed in the console lines like in the image below.

Era is an observer who loves cracking the ambiguos barriers. An AI enthusiast to help others with the drive and develop a stronger community.

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