$('#participation').change(function(){<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<select>
<option selected="true" disabled="disabled"></option>
<option value="4">4</option>
<option value="" id="participation">5</option>
</select>
<div class="musician_input_div form-group" style="display:none;">
<input type="text" id="musician_input" />
</div>
<script>
$('#participation').change(function(){
var selectval= $(this).val(); // Получим значение из select со значением #participation
if( selectval== 'musician' ) {
$('.musician_input_div').show();
} else {
$('.musician_input_div').hide();
}
});
</script>
</body>
</html><!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<select id="participation">
<option selected="true" disabled="disabled"></option>
<option value="4">4</option>
<option id="musician" value="">5</option>
</select>
<div class="musician_input_div form-group" style="display:none;">
<input type="text" id="musician_input" />
</div>
<script>
$('#participation').change(function(){
var selectval= $(this).val(); // Получим значение из select со значением #participation
if( selectval== 'musician' ) {
$('.musician_input_div').show();
} else {
$('.musician_input_div').hide();
}
});
</script>
</body>
</html>if (http.readyState == 4 && http.status == 200) {};