如何将文本值从跨度变为数字

Question

I want to make the text value to the number so I can put some calculations in the script.

<p>
     <span class="shopdetailInfoName">CONSUMER</span>
     <span class="shopdetailInfoCont">
         <strike><!--/number/price_consumer/-->
             <span class="won">$</span>
         </strike>
     </span>
</p>

so as you can see the price value coming from this <!--/number/price_consummer/--> which website developer make it is work.

I try to make some script like this ->

var a = document.getElementById ('shopdetailInfoCont');

to bring the price value as a number but .shopdetailInfoCont include "," and "$" so it bring that value to text not the number.

How can I bring the value as the number?

as a result, I want to make like this

(ex ) - product price : 45.50 $ )

if you apply -20$ discount, price will be 25.50$

any help will be so appreciated thanks!

Answer 1

var a = document.getElementById ('shopdetailInfoCont');    
floated_amount = parseFloat(a.replace(/[^0-9.-]/g, ''));

just try this regex to remove strings from your element value.

Thanks.

Answer 2

Firstly, the below shouldn't work cause your class is named shopdetailInfoCont not its id.

var a = document.getElementById ('shopdetailInfoCont'); 

Second, I don't think there is a way to get a value like you wanted, but you what you can do is get 45.50 $ and with javascript parseFloat() function will return 45.50 from that text.

Answer 3

You're using the wrong function to retrieve your element. You have the class set but not an id.

You can use `document.getElementsByClassName() to get your element. This returns an array, so you'll access your element with the 0 index.

document.getElementsByClassName("won")[0].innerHTML = "Product Price: $" + price