So I'm writing a function in javaScript that will take a user full name in one...

So I'm writing a function in javaScript that will take a user full name in one text box. "first" space "last name" But if the user does not enter the space then there should be an error. So I'm looking for a way to validate this so the user needs to enter the space.

Expert Solution

Since we have to validate a pattern, we can use Regular Expressions. We can assign a pattern in a variable and compare it with the user's input to validate.

The following code explained:

1. Store the regular expression in a variable "regularExpression"

The regular expression is: ^[a-zA-Z]+ [a-zA-Z]+$

Note that the first [a-zA-Z] is for the first name and the second is for last name.

a-z : It is for lowercase letters

A-Z : It is for uppercase letters

Note: There is a space after the + operator which denotes a space between the two names.

2. The user's input will be stored in variable "name"

3. In the if statement, use the test( ) method to match the input string and the regular expression. If the condition doesn't satisfy , print an alert message and return false.

4. In the else block, which means that the pattern has matched and there is a space between both the names.So, alert the message as "Entered name is valid" and return true.

Code:

function validate(){

    var regularExpression = /^[a-zA-Z]+ [a-zA-Z]+$/;

    var name = document.getElementById('name').value;

    if(!regularExpression.test(name)){

        alert('Error! Enter your full name - First Name and Last Name');
        document.getElementById('name').focus();
        return false;
    }
    else{
        alert('Entered name is valid');
        return true;
    }
}

This is the entire code:

<html>

<head>
<title>Example</title>
</head>

<body>
<p>Full Name: <input id="name" value=""></p>
<input type="button" onclick="validate();" value="Validate Name">
<script>
function validate(){
    var regularExpression = /^[a-zA-Z]+ [a-zA-Z]+$/;
    var name = document.getElementById('name').value;
    if(!regularExpression.test(name)){
        alert('Please enter your full name (first & last name).');
        document.getElementById('name').focus();
        return false;
    }else{
        alert('Valid name given.');
        return true;
    }
}
</script>

</body>
</script>

venereology answered 2 months ago

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