Example 1

$form = new Form('plugins-captcha-form-1', 'horizontal');

$form->addInput('text', 'j-captcha-input', '', 'Type in result please', 'class=jCaptcha');
$form->addBtn('submit', 'submit-btn', 1, 'Submit', 'class=btn btn-primary', '');

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<div class="row mb-3">
	<label for="j-captcha-input" class="col-sm-4 col-form-label">
		Type in result please
	</label>
	<div class="col-sm-8">
		<input id="j-captcha-input" name="j-captcha-input" type="text" value="" class="jCaptcha form-control">
	</div>
</div>
<div class="row">
	<div class="col-sm-offset-4 col-sm-8">
		<button type="submit" name="submit-btn" value="1" class="btn btn-primary">
			Submit
		</button>
	</div>
</div>

Example 2 - JS Captcha with custom challenge color and custom error text

$form = new Form('plugins-captcha-form-2');

$form->addInput('text', 'j-captcha-input-2', '', 'Type in result please', 'class=jCaptcha, data-color=#f00, data-error-text=This is a custome error text');
$form->addBtn('submit', 'submit-btn', 1, 'Submit', 'class=btn btn-primary', '');

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About PHP Form Builder License

<div class="row mb-3">
	<label for="j-captcha-input-2" class="col-sm-4 col-form-label">
		Type in result please
	</label>
	<div class="col-sm-8">
		<input id="j-captcha-input-2" name="j-captcha-input-2" type="text" value="" class="jCaptcha form-control" data-color="#f00" data-error-text="This is a custome error text">
	</div>
</div>
<div class="row">
	<div class="col-sm-offset-4 col-sm-8">
		<button type="submit" name="submit-btn" value="1" class="btn btn-primary">
			Submit
		</button>
	</div>
</div>