CODEWITHSUNDEEP
javascriptvalidation
mao
mao

Reputation: 1077

Javascript validation

I'm hoping someone can help me with a bit of validation, I'm taking the value of a form input as a string. I need to validate this against a couple of rules, so it can become a table name. I can do them individually but I've no idea how to put it together. The input (tempName) needs to:

  1. Have spaces replaced by underscores
  2. Have no special characters
  3. Be less than 25 characters

1.

    newName = tempName.replace(' ', '_')

2.

    var regex=/^[0-9A-Za-z]+$/; //^[a-zA-z]+$/

    if(regex.test(tempName)){
    tempName = newName
    return true;
    } 

    else {
    alert("Only letters + numbers allowed - no special characters or spaces.")
    return false;
    }

3.

    if (tempName.length < 25) {
    newName = tempName
     }

    else {
    newName = tempName.substr(0,25);    
    }

Apologies for asking something so simple but I haven't really worked with javascript properly for a few years and I'm having trouble with nested if statements and setting conditions.

Help would be greatly appreciated.

Thanks.

Upvotes: 3

Views: 198

Answers (3)

Ry-
Ry-

Reputation: 224913

if(/^\w{,25}$/.test(name = name.replace(/\s/g, '_'))) {
    // It's valid.
}

Is probably what you want.

Edit: If you want to truncate to 25 characters, it's:

if(/^\w+$/.test(name = name.replace(/\s/g, '_').substring(0, 25))) {
    // It's valid.
}

Upvotes: 5

kasdega
kasdega

Reputation: 18786

Well the first two you can put together.

newName = tempName.replace(" ", "_").replace(/\W/g, "");

But then I'd check for the length of the remaining string after the replaces to make sure I don't get a index out of range.

if(newName.length > 25) {
   newName = newName.substring(0, 25);
}

Upvotes: 1

Taersious
Taersious

Reputation: 779

Sounds like you just need to drop most of that in a JavaScript function block.

function validateTableName(tempName)
{
var newName='';
your code here...
return newName;
}

HTH...

Upvotes: 1

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