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I want to write for WooCommerce product features with .. alert and I need help to complete the code

If the user selects a variable from the available product and one of the variables selected by the user is null, I want to show a warning to the user.

`

<?php
// PHP program to pop an alert
// message box on the screen
  
// Display the alert box 
echo '<script>alert("Welcome to Geeks for Geeks")</script>';
  
?>

`

`
this is my code

2

Answers


  1. I don’t really understand what you mean, maybe this can help you

    function Check(){
            var prod = document.getElementById('product1').value
            if(prod <= 0 || prod == ""){
                alert("Failed");
                } else {
                alert("Success")    
                }
            }
    Product 1 
      <input type="number" id="product1" value="" size="5">
      <button type="button" onClick="Check()">Click</button>
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  2. For example, suppose
    We have a product that has an XL size and it has 2 colors, red and blue
    We have 2 pieces of blue color in stock
    But there are 0 pieces of red in stock

    We want to show a message to the user if the user chooses the red size XL, that the stock of this variable in the warehouse is 0.

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