CODEWITHSUNDEEP
javascriptjquery
minx
minx

Reputation: 27

Using a switch statement to create a new variable

I am using a switch statement to taken input data from an HTML text-box.

Thus far, it has been successful.

My next step is the following: if the user enters the number 20, I would like to input new data into a variable called "coordinates" so it may be used throughout the program.

So far, I am unable to use data from the variable "coordinates". Any suggestions?

switch(Number($('#inputdata').val())){
case 20:
var coordinates = {
      latt1: 12,
      lngg2: 34
}
break;
}

Upvotes: 0

Views: 89

Answers (4)

Nickydonna
Nickydonna

Reputation: 802

I would argue that declaring the variable outside the switch and assign it is not a good idea, in the long run it can make thing harder to debug.

I would make a function that return the desired value and assign it to coordinated

function inputToCoordinate (inputValue) {
  switch(inputValue) {
    case 20:
      return {
        latt1: 12,
        lngg2: 34
      }
    // ...

  }
}

var input = $('#inputdata').val();
var coordinates = inputToCoordinate(parseInt(input, 10))

Also I'm not a big fan of switch statement, but that is another discussion.

Upvotes: 0

Cruiser
Cruiser

Reputation: 1616

You need to have your variable outside the switch statement. I would think about putting it in a closure like so:

function getCoordinates(element){
    var coordinates = {};
    // the closure is an immediately invoked function
    // that sets the coordinates variable according to
    // to the switch statements;
    var coord = function(){
        switch(parseInt(element.val()))
        // case statements
        coordinates = {"latt1":12,"lngg2":34};
    }();
    // ^^ means run this function now
    return coordinates;
}

Then you can just assign the return of the outer function to a variable.

var c = getCoordinates($('#inputdata'));

The benefits here are that you don't pollute the global namespace with a global variable, your coordinates variable is private data, and you can easily modify the function params if you don't want to have a ton of switch statements.

Upvotes: 0

Mohtisham Zubair
Mohtisham Zubair

Reputation: 723

you need to save this input data into your coordinate variable

var coordinates = {
      latt1: Number($('#inputdata').val()),
      lngg2: 34
}

Upvotes: 0

mehulmpt
mehulmpt

Reputation: 16587

Make your variable global?

var coordinates;

switch(Number($('#inputdata').val())){
case 20:
coordinates = {
      latt1: 12,
      lngg2: 34
}
break;
}

Upvotes: 1

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