This method helps to detect the changes of the file input field. After that, we have used the submit method to submit the form automatically. If you test it on your browser then you will see that the form submitted automatically when you select a file.
We have used the jQuery change method to detect the change in uploader input field by the id of the field and then submit the form automatically using JavaScript submit method. If you test it on your browser, then you will see the same thing is happening in here also. On the other hand, if the form is hosted on a secure page but you specify an insecure HTTP URL with the action attribute, all browsers display a security warning to the user each time they try to send data because the data will not be encrypted.
The action value should be a file on the server that can handle the incoming data, including ensuring server-side validation. The server then responds, generally handling the data and loading the URL defined by the action attribute, causing a new page load or a refresh of the existing page, if the action points to the same page. The method attribute defines how data is sent.
To understand the difference between those two methods, let's step back and examine how HTTP works. Each time you want to reach a resource on the Web, the browser sends a request to a URL. An HTTP request consists of two parts: a header that contains a set of global metadata about the browser's capabilities, and a body that can contain information necessary for the server to process the specific request.
The GET method is the method used by the browser to ask the server to send back a given resource: "Hey server, I want to get this resource. Because the body is empty, if a form is sent using this method the data sent to the server is appended to the URL.
After the URL web address has ended, we include a question mark? In this case we are passing two pieces of data to the server:. Note: You can find this example on GitHub — see get-method. The POST method is a little different. It's the method the browser uses to talk to the server when asking for a response that takes into account the data provided in the body of the HTTP request: "Hey server, take a look at this data and send me back an appropriate result.
The Content-Length header indicates the size of the body, and the Content-Type header indicates the type of resource sent to the server. We'll discuss these headers later on. Note: You can find this example on GitHub — see post-method. As an example, your form data will be shown as follows in the Chrome Network tab. After submitting the form:. The only thing displayed to the user is the URL called.
This can be very important for two reasons:. The way you access this list depends on the development platform you use and on any specific frameworks you may be using with it. PHP offers some global objects to access the data. Assuming you've used the POST method, the following example just takes the data and displays it to the user. Of course, what you do with the data is up to you.
You might display it, store it into a database, send it by email, or process it in some other way. They are also validated with the required attribute, so the form fails to submit when those fields are empty or when the user fails to type in the values in the appropriate format. After all that, we'll have the result in the screenshot below:. We used a font-family of cursive.
The labels got a minimal line-height of 1. We specifically styled the button input type button with the transform property to push it to the center as it was off center a bit. We gave it a padding of 3px for more spacing around it. We then selected a cursive font-family for it with a weight of bold. Because the button was too close to the textarea , we set a margin-top of 0. We gave our fieldset element a padding of 20px at the top and bottom, with 40px at the left and right to push apart the border it creates around the form elements it is wrapped in.
At the end of it all, we have the beautiful form below:. I hope this tutorial has helped you understand how forms work. Now you should have the knowledge you need to integrate forms into your websites so you can start collecting data. If you read this far, tweet to the author to show them you care. Tweet a thanks. Learn to code for free. Get started. Forum Donate. Kolade Chris. Posted by: admin November 26, Leave a comment.
I have a simple file upload form. How do I make it submit automatically when a file has been selected? For those who are using. NET WebForms a full page submit may not be desired.
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