Why is javascript functions not working after adding another function with an error?

Question

I had two javascript functions that added text input values to an input type=select between <script> tags.

After I added one more function, the above functions stopped working. I found that the error was that I had forgotten the 0 in the if logical block. But this function with an error was at no point executed.

The thing I want to know is why would a function that is not called cause other functions to not operate?

Code of javascript functions that worked

function addCompanyFunction() {
          var x = document.getElementById("companylist");
          var txt = document.getElementById("taname");
          var option = document.createElement("option");
          if (txt.value != "") {
              option.text = txt.value;
              x.add(option, x[0]);
              }
        }
        function addCultFunction() {
          var x = document.getElementById("cultlist");
          var txt = document.getElementById("cultname");
          var option = document.createElement("option");

          if (txt.value != "") {
              option.text = txt.value;
              x.add(option, x[0]);
              }
        }

After adding the following function with its error the other functions stopped working

function filled_out(dict) {
    var i;
    if (dict.length > ) { //<--- the zero is missing which caused the problem
        for (var key in dict) {
            if (dict[key] == "") {
                return true;
            } 
        }
        return false;
    }
    return false;

}

t.niese · Accepted Answer · 2019-08-16 15:53:00Z

1

That's because it is a SyntaxError. And a SyntaxError happens at parsing time and will prevent the whole block of code that is parsed from being executed.

answered Aug 16, 2019 at 15:53

community wiki

t.niese

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1 Comment

Hmerman6006 Over a year ago

Thanks that explains it. I read a bit futher and found that when a syntax error occurs in JavaScript, only the code contained within the same thread as the syntax error is affected. Very interesting. Thanks again.

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