slim-validation

Lightweight jQuery validation plugin.

Instalation

node: npm install slim-validation :sparkling_heart:

git: git clone https://github.com/andreiduca/slim-validation.git

or download the ZIP archive, extract and use the files from the /src folder. See /demo/index.html for a quick implementation.

Usage

HTML-only setup required. Just set the "data-validate" custom attribute on your inputs and you're ready to go:

<input type="text" data-validate="required" />

Chain multiple validation rules using the empty space as a delimiter:

<input type="text" data-validate="required email" />

Validation behavior

The validation action is triggered by default on the "blur" event on each input.

After each validation, a custom event is triggered so you can bind your own behavior to it, like this:

$('body').on('validation:end', '[data-validate]', function(event, $input, value, isValid, errorMessage) {
    // ... your code goes here
});

Notice the parameters you can use at your own disposal. Use your imagination!

In the demo HTML I only added a colored border and error message after each input to highlight its status:

$('body').on('validation:end', '[data-validate]', function(event, $input, value, isValid, errorMessage) {

    $input.next('span').remove();

    if (!isValid) {
        $input.after('<span style="color:red;">' + errorMessage + '</span>');
        $input.css({"border": "1px solid red"});
    }
    else {
        $input.after('<span style="color:green;">data is valid</span>');
        $input.css({"border": "1px solid green"});
    }
});

Note: $input is a jQuery wrapper of the actual input being validated.

Form validation

You can also validate an entire form at once.

$("#testForm").validateForm();

When a form is validated, all containing HTML elements having the data-validate attribute will be validated.

In the end, another custom event is triggered:

$('body').on('validation:form', '#testForm', function(event, $form, isValid, $firstErrorInput) {
    // ... your code goes here
});

You can see if the $form has errors or not with the isValid parameter and you can, for example, scroll to the $firstErrorInput and focus it.

Error messages

Error messages are also defined with custom "data-" attributes:

<input type="text" data-validate="required" data-error="invalid data" />

Custom error messages for each validation rule can also be defined:

<input type="text" data-validate="required email"
        data-error="generic error"
        data-error-email="Invalid email" />

This is great for internationalized websites where you need translated error messages, and works best with template engines such as smarty or twig. Yes: no more javascript files filled with translated messages!

Advanced validation rules

Some rules require a configurable parameter, like a number to compare against. It's simple: just add the number after that rule:

<input type="text" data-validate="minLength 3" />

More rules for the same input? Just chain them as usual.

Validations rules reference:

(This is a work in progress)

• required: the value must not be an empty string;
• requiredBy: the value must not be empty only if a related input is not empty;
• numeric: the value must contain only digits;
• integer: the value must be a valid integer (negative values allowed);
• min: the value must be an integer greater than or equal to the provided parameter;
• max: the value must be an integer lower than or equal to the provided parameter;
• range: the value must be an integer in the range provided using the format 1..10;
• number: the value must match one of the following number formats: -12345.6789, -12345,6789, -12,345.6789, -12.345,6789 (the negative sign and the fractional part are optional);
• minLength: the value's length must be more than or equal to the provided parameter;
• maxLength: the value's length must be less than or equal to the provided parameter;
• email: the value must match a "practical RFC 5322" regex: (see http://www.regular-expressions.info/email.html)