Display HTML Select box Based on Selecting Option From Other Select box Noob Question-CodePudding

Trying to get innerHTML to display select box when an option of another select box is chosen.

Here's my code:

<!DOCTYPE html>
<html>
<head>
<script   src="https://code.jquery.com/jquery-3.6.0.min.js"   integrity="sha256-/xUj 3OJU5yExlq6GSYGSHk7tPXikynS7ogEvDej/m4="   crossorigin="anonymous"></script>
<link href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/select2.min.css" rel="stylesheet" />
<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/js/select2.min.js"></script>
<script> // In your Javascript (external .js resource or <script> tag)
$(document).ready(function() {
    $("#cars2").select2();
});
</script>
<!--Need help here-->
<script>
function myFunction(event){
 var x = document.getElementById("myDIV");
 //here you are picking the selected option item
 var y = $('select#cars2 option:selected').val();
 switch (y) {
  case '1':
    x.innerHTML = "<label for="carsyo">Choose a yingyang</label>

<select name="cars3" id="cars4">
  <option value="volvo">Voldo</option>
  <option value="saab">Roy drives</option>
  <option value="mercedes">Mercedes</option>
  <option value="audi">Audi</option>
</select>";
    break;
  case '2':
    x.innerHTML = "<p>Roy!</p>";
  }
}
</script>

<style>
select {
width: 150px;

}
</style>
</head>
<body>
<div id="myDIV"><p>
Hello
</p></div>

<label for="cars">Choose a car:</label>

<select id="cars2" onchange="myFunction()">
<option value="0">Pick something</option>
  <option value="1">Volvo</option>
  <option value="2">Saab</option>
  <option value="3">Opel</option>
  <option value="4">Audi</option>
</select>
</body>
</html>

JSFiddle here: https://jsfiddle.net/CoolBuys1290/59qmbt0f/28/

Web page doesn't do anything. I have to add extra text for some reason.

Please help a noob out.

Thanks

CodePudding user response：

On line 20-27, you have a multiline string with " quotes. You can't create multine strings using " in JS without adding \ to the end of each line. So simply replace the " with ` where you need to create a multi-line string like this: x.innerHTML = `<label for="carsyo">Choose a yingyang</label>

The better option would be to include the second select directly in your HTML and show/hide it like this.