CODEWITHSUNDEEP
javascriptjqueryvalidationsapui5
Scott
Scott

Reputation: 171

Javascript - Validation on input - Can I check if character x is number and character y is letter

I have a SAPUI5 project and have an input which I'm wanting to do some validation on.

It is inputting an 8 character length entry with a mixture of numbers and letters. I have the input max length at 8 characters already.

What I need is to create a function to only allow entry of either a number or a letter at certain characters in the entry (see below).

1 - Letter 2 - Letter 3 - Number 4 - Letter 5 - Number 6 - Number 7 - Number 8 - Number

eg, BP1A8123

Is there a way to do that in JavaScript? I've come across examples of letters only or number only but can't find an example of number / letters at certain characters within the entry.

Any direction would be appreciated.

Upvotes: 2

Views: 2175

Answers (3)

rikusv
rikusv

Reputation: 666

From a JavaScript perspective, you could do the check like this:

pattern = RegExp('[A-Z]{2}[0-9]{1}[A-Z]{1}[0-9]{4}')
pattern.test('BP1A8123') // true
pattern.text('B1111111') // false

From a SAPUI5 perspective, input validation is generally handled via the data binding. See, for example, this SAPUI5 Demokit Sample. Also see the validationError and validationSuccess events of class `sap.ui.core.Core'.

However, for your specific requirement, the sap.m.MaskInput control may be what you're after. See this Demokit example.

Upvotes: 2

Mathieu Dumez
Mathieu Dumez

Reputation: 25

You can split the string using .split('') (see here), parse the character into int to check if the variable is a number using isNaN (see here).

Upvotes: -1

Joe Iddon
Joe Iddon

Reputation: 20424

So we have the template:

template = ['letter', 'letter', 'number', 'letter',
            'number', 'number', 'number', 'number']

... and some input:

input = 'BP1A8123'

We can then just use isNaN() to check whether the respective characters are letters:

input.split('').every((c,i) => isNaN(c)  || template[i] == 'number')

which gives true in this instance.

Upvotes: 0

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