Javascript to display uploaded image in html Let’s add the javascript code to display the image in the HTML element then.
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Contents
How to preview image before upload from input type file using JavaScript?
Explanation – Form encoding type will be used to upload the file on the server-side (PHP). Give your input type file a unique ID so it can be accessed in Javascript. We have created an image tag where a preview of the selected file will be displayed. Give a unique ID to this image tag too.
A function on onchange event on input type file will be called whenever user select some file from dialog. We are also adding an attribute accept=”image/*” that will make sure that the user selects only the image files like JPEG, PNG etc. In this function, first we are checking if the user has selected any file.
We are creating a FileReader object, it is used to read the file. With this file reader object, we are calling a function named readAsDataURL, it will read the content of a file as URL. That URL will be used to set the “src” attribute of our image tag.
- Onload event will be called when the file is fully read by file reader object.
- In this function, we are simply setting the “src” attribute of our image tag.
- Event.target refers to the original file reader object and “result” is the actual URL of selected file.
- Since you have learned how you can preview an image before upload from input type file using Javascript.
Learn also how to upload, download and delete files in PHP.
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How to display an image in JavaScript?
In the JavaScript file, let’s start by getting access to the input field and attaching a ‘change’ event listener to it. Within this event listener, we’ll need to access the FileReader object and attach a ‘load’ event listener. In a nutshell, this translates the incoming image into something we can use to display it.
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How to access input type file in JavaScript?
Explanation – Form encoding type will be used to upload the file on the server-side (PHP). Give your input type file a unique ID so it can be accessed in Javascript. We have created an image tag where a preview of the selected file will be displayed. Give a unique ID to this image tag too.
A function on onchange event on input type file will be called whenever user select some file from dialog. We are also adding an attribute accept=”image/*” that will make sure that the user selects only the image files like JPEG, PNG etc. In this function, first we are checking if the user has selected any file.
We are creating a FileReader object, it is used to read the file. With this file reader object, we are calling a function named readAsDataURL, it will read the content of a file as URL. That URL will be used to set the “src” attribute of our image tag.
- Onload event will be called when the file is fully read by file reader object.
- In this function, we are simply setting the “src” attribute of our image tag.
- Event.target refers to the original file reader object and “result” is the actual URL of selected file.
- Since you have learned how you can preview an image before upload from input type file using Javascript.
Learn also how to upload, download and delete files in PHP.
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How to accept image files in HTML?
Let’s start with our HTML. Inside our body, we’ll create an input field of type file. Notice that the input field contains an accept attribute. Here, you can indicate the image file types you want the program to accept. I’ve added.jpeg,.png, and.jpg for this example.
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