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Javascript switch

Posted on 2009-07-12
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Last Modified: 2012-05-07
I have a callback function (onContentLoad) that is parsing some json.  I have a bunch of if/else statements that I'd like to turn into a swtich.
onContentLoad: function (json) {

    //Parse the returned JSON response

    if (json.result == 'success' && json.addremove == 'add') {
 

}

    else if (json.result == 'success' && json.addremove == 'remove') {
 

}

    else if (json.result == 'fail' && json.message == 'action-failed') {
 

}

    else if (json.result == 'fail' && json.message == 'number-exceeded') {
 

}

    else if (json.result == 'fail' && json.message == 'not-logged-in') {
 

}

}

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Question by:aznprncritic
2 Comments
 
LVL 36

Accepted Solution

by:
Zyloch earned 250 total points
ID: 24835544
You cannot turn a condition in which you are testing two equalities into a single switch. What you can do is:

//Parse the returned JSON response

if (json.result == 'success')

{

    switch (json.addremove)

    {

    case 'add':

        // Code

        break;

    case 'remove':

        // Code

        break;

    }

}

else if (json.result == 'fail')

{

    switch (json.message)

    {

    case 'action-failed':

        // Code

        break;

    case 'number-exceeded':

        // Code

        break;

    case 'not-logged-in':

        // Code

        break;

    }

}

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LVL 41

Expert Comment

by:HonorGod
ID: 24835560

if ( json. result == 'success' ) {

  if ( json.addremove == 'add' ) {

//  #1 - json.result == 'success' && json.addremove == 'add' 

  } else {

//  #2 - json.result == 'success' && json.addremove == 'remove' 

  }

} else {

  switch ( json.message ) {

    case 'action-failed' :

//    #3 json.result == 'fail' && json.message == 'action-failed'

      break;

    case  'number-exceeded' :

//    #4 json.result == 'fail' && json.message == 'number-exceeded'

      break;

    case 'not-logged-in' :

//    #5 json.result == 'fail' && json.message ==    'not-logged-in'

      break;

    default :

      alert( 'oops' );

  }

}

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