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I need help fixing my html and java script code

<p>I want to make a place where you can enter your next birthday and the page will turn into a window. Remind you that your birthday is in a few days. When I run the code, before I enter the birthday, the alert says NaN, which means is not a number. I want it to work after I type my birthday and after I click submit. This is the code I wrote:</p> <p>` </p> <pre class="brush:php;toolbar:false;"><input type="submit" value="Submit"> </form> <script> let date_1 = new Date(document.getElementById("bday").value); let date_2 = new Date(); let difference = date_1.getTime() - date_2.getTime(); let TotalDays = Math.ceil(difference / (1000 * 3600 * 24)); window.alert(TotalDays); </script> </body>`</pre> <p><br /></p>
P粉201448898P粉201448898515 days ago617

reply all(1)I'll reply

  • P粉523625080

    P粉5236250802023-08-02 11:47:11

    <!DOCTYPE html>
<html>
<head>
  <title>Birthday Countdown</title>
</head>
<body>
  <form onsubmit="calculateDaysLeft(event)">
    <label for="bday">Enter your birthday:</label>
    <input type="date" id="bday" name="bday" required>
    <input type="submit" value="Submit">
  </form>

  <script>
    function calculateDaysLeft(event) {
      event.preventDefault(); // Prevent form submission to avoid page reload

      // Get the user's birthday from the input field
      let userBirthday = new Date(document.getElementById("bday").value);

      // Get the current date
      let currentDate = new Date();

      // Calculate the difference in milliseconds
      let difference = userBirthday.getTime() - currentDate.getTime();

      // Calculate the difference in days and show the alert
      let totalDays = Math.ceil(difference / (1000 * 3600 * 24));
      window.alert(`There are ${totalDays} days left until your birthday!`);
    }
  </script>
</body>
</html>

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