Checkbox Fix Post

This library fixes checkboxes so that they submit a value on a form submit, even if they are not selected, by adding an "inverse-value" attribute to your checkbox.

It uses vanilla Javascript and does not rely on external libraries.

Usage

<script src="./checkbox-fix-post.bundle.js"></script>
<script>
    checkboxfixpost();
</script>
<form action="" method="get">
    <label for="checkbox1">
        <input type="checkbox" name="checkbox1" value="1" inverse-value="0">
        Checkbox 1
    </label>
    <br>
    <label for="checkbox1">
        <input type="checkbox" name="checkbox2" value="1" inverse-value="0">
        Checkbox 2
    </label>
    <br>
    <input type="submit" value="Submit">
</form>
<hr>
<form action="" method="get">
    <label for="checkbox3">
        <input type="checkbox" name="checkbox-inverse" value="Blah" inverse-value="Yack">
        Checkbox with Inverse
    </label>
    <br>
    <input type="submit" value="Submit">
</form>

Options

You can pass the following options when calling checkboxfixpost():

selector

A selector for a form or forms you want to target. Defaults to form. Eg. #myForm.

checkbox_selector

A selector for the checkboxes you wish to target. Defaults to all checkboxes with input[type="checkbox"].

Specifying values

Set inverse-value as an attribute on the checkbox input. If the checkbox is checked, the value will be the value of the checkbox. If the checkbox is not checked, the value will be the value of inverse-value.

<input type="checkbox" name="checkbox-inverse" value="Blah" inverse-value="Yack">

NOTE - Breaking Change Pre-version 1.0.0, a value of 0 will always be returned if the checkbox is selected, unless you set the property inverse-value on the checkbox, in which case that value will be sent. Post v1.0.0, unless inverse-value is set, the checkbox will act as a normal checkbox. If you want to send a value of 0, you must set inverse-value to 0.

Using as a library

You can use this as a library by simply requiring it.

npm i --save checkbox-fix-post

const CheckboxFixPost = require("checkbox-fix-post");
const checkbox_fix_post = new CheckboxFixPost({
    selector: `form`,   // Default
    checkbox_selector: `input[type="checkbox"]` // Default
});