The Possibilities Newsletter - [P#1198] Submit Any Form Via Ajax

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Possibilities
Coding Tips, Tricks, and Treasures
(For website owners and developers.)
July 12, 2022
- Issue 1198 -

Will and Mari Bontrager, Publishers
Copyright 2022 Will Bontrager Software LLC


Possibilities

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Article:

Submit Any Form Via Ajax

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Prelude:

Hello ,

Half price for the first of my candy recipe books —

$2.99 instead of $5.99

The Amish Recipes: Chocolate-Covered Candy ebook is half price during July when purchased at Smashwords (not at other retailers).

Go buy it at half price at Smashwords

Other purchase options (Kindle, iBooks, …)

This is the first of my Amish-recipe candy books. It contains stories about my relationship with candy while growing up.

Once you have made chocolate-covered candy a time or several, it can become surprisingly easy for you. This special candy is so good it is bound to be highly praised by anyone you share it with.

Smashwords  •  Other retailers

~ — O — ~

Last week's article —

It is possible to build expanding/collapsing navigation menu items with pure HTML. No JavaScript. And, optionally, no CSS.

willmaster.com/…/without-javascript.php

~ — O — ~

This week's article —

(Quick link) Ajax form submission with any form — without knowing in advance what the field names are, or how many fields the form has.

Enjoy the issue, .

Will Bontrager


Possibility:

Submit Any Form Via Ajax

Recently, I needed to use Ajax to send form information to a script on a server.

The form fields were unpredictable. Sometimes there may have been an email field and sometimes not, for example. Sometimes the form had dozens of fields to submit, sometimes only a few.

Further, there were some form fields that should not be sent to the script (fields used for determining the content of other fields, like math formulas).

The requirement led me to create a simple JavaScript function for submitting a form via Ajax — without knowing in advance what the form fields would be.

What is Ajax?

Ajax is a tool programmed with JavaScript. The tool is used to send information to and get information from URLs. The way it connects to the URLs is with HTTP or HTTPS, the same methods that browsers use.

What makes Ajax special is that it can use HTTP/S to connect to other web pages or software on the internet from within the web page already loaded in the browser.

Thus, Ajax can be used to send form information to a PHP script on the server — without reloading the web page that has the form.

When Ajax is used to send form information to a server script, the form field names generally are specified within the Ajax source code. Yet when, as in the situation described above, the form fields are not known ahead of time and might change from page load to page load, form field names can not be specified with acceptable accuracy.

Another way had to be found. That method is what this article is about.

The online article goes into more detail. It also provides a simple little PHP script you can use for testing your Ajax.

Thank you for reading Possibilities.

~ — O — ~

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