Escaping forward slash ("/") while using JavaScript to change CSS class

Question

I need to add some CSS class based on some condition using JavaScript but facing issue in case my string contains a forward slash (/). This is what my use case is

<div id="div_product-size-icon-121NM/L" class="disabled"></div>
<script>
var newProductCode = '121NM/L';
 if(  newProductCode.contains('/') ){
       newProductCode = newProductCode.replace('/','/\//');
       $('#'+'div_product-size-icon-'+newProductCode).addClass('active');
    }
</script>

I have even tried newProductCode.replace('/','/\'); but while running code, I am facing following error

JavaScript error: SyntaxError: unterminated string literal

I can not change HTML along with product code; the option for me is to change it in JS.

Here is a working js example: JS code

Answer 1

I have first replaced the if statement with indexOf() and changed the .replace function as .replace('/', '\\/');

var newProductCode = '121NM/L';
if (newProductCode.indexOf('/') > 0) {
  alert('Once you click OK, the text will disappear!!');
  newProductCode = newProductCode.replace('/', '\\/');
  $('#' + 'div_product-size-icon-' + newProductCode).addClass('active');
}

div.active {
  display: none;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="div_product-size-icon-121NM/L" class="disabled">Some text here</div>