Tips for utilizing a variable from a function in one file within a function in another file

Having trouble using the variable counter from one function in a different file? In the first function, I defined counter without using "var" thinking it would make it a global variable. But for some reason, it doesn't seem to work. Help needed!

//function used in symptoms.html
  function checkboxes(){
    counter = parseInt(document.querySelectorAll('input[type="checkbox"]:checked').length); //counter should be global var?
    if (counter>=10){
          location.href='end.html';
    }else{
      location.href='state.html';
    }
    }

//function used in another file
    function statedegree(x){
        var conclusion=x*counter;//uses counter var from checkboxes()
         if (conclusion>=18){
           location.href= 'end.html';
         } else{
           location.href='end1.html';
         }
    }

Answer №1

Utilizing the localStorage API allows for persistence across multiple pages:

function checkValues(){
    localStorage.setItem('counter', document.querySelectorAll('input[type="checkbox"]:checked').length);
    if (counter>=10){
          location.href='final-page.html';
    }else{
      location.href='next-page.html';
    }
}
function calculateDegree(x){
    var result = x * parseInt(localStorage.getItem('counter') || 0);
     if (result >= 18){
       location.href= 'endpage.html';
     } else{
       location.href='alternate-end.html';
     }
}

Answer №2

I am unsure of the sequence in which your files are organized, but it is essential for the second file to be included in the HTML document after the first file that contains the variable declaration. Likewise, I suggest ensuring that the function declaring the variable is invoked before the second file is called.

If not, you have the option to declare your variable as global by using window.counter across multiple files.

Feel free to correct me if my understanding is incorrect.

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