JavaScript passing values between functions [closed]

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I have to functions, one is within an external js file named "london.js" and one is within a HTML script.

I wish to take a value from the external file and insert it into my HTML script function.

   function initMap(cityLatLng) {
      map = new google.maps.Map(document.getElementById('map'), {
      zoom: 12,
      center: ldn,
}

  function loadLondon() {
      var ldn = {lat: 51.5, lng: -0.1}
}

I am not sure how to pass values through functions, I have tried putting the variable outside the function but it didn't work. I wish to make use of the var ldn in initMap.

Thanks in advance.

I see two functions with no calls to either. Please edit your question to include a minimal reproducible example — j08691
– j08691, Commented Mar 20, 2018 at 14:02
Possible duplicate of Javascript passing parameters to function — messerbill
– messerbill, Commented Mar 20, 2018 at 14:03
Which one is your external? And which one is your embedded script? Do you have control over the external script? Are you able to make changes to it? — khollenbeck
– khollenbeck, Commented Mar 20, 2018 at 14:08
@KrisHollenbeck initMap is internal and loadLondon is external, I am able to make changes to both, I just wish to make use of that variable within the other function — Overtime
– Overtime, Commented Mar 20, 2018 at 14:11

Ele · Accepted Answer · 2018-03-20 14:03:03Z

2

An alternative is to return that variable ldn and assign it to the property center:

function initMap(cityLatLng) {
  map = new google.maps.Map(document.getElementById('map'), {
  zoom: 12,
  center: loadLondon(),
}

function loadLondon() {
  var ldn = {lat: 51.5, lng: -0.1};

  // your logic with ldn;

  return ldn;
}

answered Mar 20, 2018 at 14:03

Ele

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3 Comments

Scott Sauyet Over a year ago

Although this sounds good in theory, the word load in the function makes me wonder if it's being loaded asynchronously, in which case, there is a lot more work to do.

Overtime Over a year ago

@Ele there are other functions that may need to fill 'center' with other coordinates, such as a function named loadCardiff in the external file

Ele Over a year ago

Please add more code to understand the whole context.

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