Question

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if variable contains

rated 0 times [ 0] [ 3] / answers: 1 / hits: 133720 / 12 Years ago, mon, october 22, 2012, 12:00:00

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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.

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lamontm

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2 Years ago

answered 12 Years ago tatyanna · Accepted Answer

You might want indexOf

if (code.indexOf(ST1) >= 0) { ... }

else if (code.indexOf(ST2) >= 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') >= 0):

        document.write('code contains ST1');

        break;

    case (code.indexOf('ST2') >= 0):

        document.write('code contains ST2');        

        break;        

    case (code.indexOf('ST3') >= 0):

        document.write('code contains ST3');

        break;        

    }