$(document).ready(function () { var curr = $('#selectCaptcha').val(); $(`#${curr}`).css('display', 'block'); }); $('#selectCaptcha').change(function () { $('.captcha').css('display', 'none'); var curr = $(this).val(); $(`#${curr}`).css('display', 'block'); });

<div class="captcha" id="default"> 
    <a class="captcha-link" href="http://localhost:8000/captcha/?v=5db5a8c5d5e5a">reload</a> <br>
    <img class="captcha-img" src="http://localhost:8000/captcha/image/?v=5db5a8c5d5e5a"> <br>
    <input class="captcha-input" type="text">
</div>
<div class="captcha" id="math" style="display: none;"> 
    <p>1 + 2 = <input class="captcha-input" type="text"></p>
</div>
<div class="captcha" id="noise" style="display: none;"> 
    <a class="captcha-link" href="http://localhost:8000/captcha/?v=5db5a8c5d5e5a">reload</a> <br>
    <img class="captcha-img" src="http://