if variable contains

Question

Possible Duplicate    JavaScript  string contains       I have a postcode variable and want to use JS to add a location into a different variable when the postcode is changed entered   So for example if ST6 is entered I would want Stoke North to be entered   I somehow need to do an if statement to run through e g   if code contains ST1        location   stoke central    else if code contains ST2        location   stoke north       etc     How would I go about this   It s not checking if  code  equals a value but if it contains a value  I think this is my problem

User · Answer

if  code indexOf  ST1   gt  0    location    stoke central

User · Answer

If you have a lot of these to check you might want to store a list of the mappings and just loop over that  instead of having a bunch of if else statements   Something like   var CODE TO LOCATION        ST1    stoke central      ST2    stoke north                function getLocation text      for  var code in CODE TO LOCATION        if  text indexOf code     -1          return CODE TO LOCATION code               return null      This way you can easily add more code location mappings   And if you want to handle more than one location you could just build up an array of locations in the function instead of just returning the first one you find

User · Answer

The fastest way to check if a string contains another string is using indexOf   if  code indexOf  ST1       -1           string code has  ST1  in it   else          string code does not have  ST1  in it

User · Answer

You can use a regex   if   ST1 i test code

User · Answer

You might want indexOf  if  code indexOf  ST1    gt   0          else if  code indexOf  ST2    gt   0            It checks if contains is anywhere in the string variable code  This requires code to be a string  If you want this solution to be case-insensitive you have to change the case to all the same with either String toLowerCase   or String toUpperCase     You could also work with a switch statement like  switch  true        case  code indexOf  ST1    gt   0           document write  code contains  ST1             break      case  code indexOf  ST2    gt   0           document write  code contains  ST2                     break              case  code indexOf  ST3    gt   0           document write  code contains  ST3             break

[javascript] if variable contains

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