10 examples of 'first name validation in javascript' in JavaScript

53
validateDisplayName(): void {
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    if (this.signup.displayName) {
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        if (!Patterns.DisplayName.test(this.signup.displayName)) {
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            this.setError('Please provide a valid display name');
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            this.signup.displayNameValidated = false;
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            return;
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        } else {
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            this.setError('');
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            this.signup.displayNameValidated = true;
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        }
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    }
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}

88
function validateName()
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{
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    if($('#name').val().length == 0)
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    {
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        return;
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    }
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    if(customObject)
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    {
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        if($('#name').val().toLowerCase() == customObject.name.toLowerCase())
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        {
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            $('#name_availability_button').attr('class', 'btn btn-success');
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            $('#name_availability_button').html('<i></i> ' + loc.generic.AVAILABLE);
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            return;
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        }
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    }
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    $.getJSON('/api/custom_objects/get_object_type_name_available?name=' + $('#name').val(), function(response)
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    {
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        if(response.code == 0)
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        {
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            if(response.data)
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            {
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                $('#name_availability_button').attr('class', 'btn btn-success');
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                $('#name_availability_button').html('<i></i> ' + loc.generic.AVAILABLE);
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            }
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            else
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            {
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                $('#name_availability_button').attr('class', 'btn btn-danger');
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                $('#name_availability_button').html('<i></i> ' + loc.generic.UNAVAILABLE);
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            }
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        }
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    });
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}

175
validate_name(value)
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{
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	const { translate } = this.props
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	if (!value)
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	{
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		return translate(messages.registration_name_is_required)
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	}
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}

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function on_validation(name, value) {
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    switch (name) {
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        case 'name':
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        case 'street':
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        case 'city':
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            return value.length > 0;
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        case 'email':
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            return value.isEmail();
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        case age:
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            // The value will be always Number (The framework compares types)
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            return value > 18 && value < 60;
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    }
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}

10
function validateUsername() {
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    var username = $('#username').val();
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    console.log(username);
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    if (username.match(nameRegex) != null) {
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        if (username.length <= 8) {
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            window.location.replace('/chat/' + username);
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        } else {
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            alert("Username is not valid. Maximum 8 characters allowed.");
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        }
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    } else {
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        alert("Username is not valid. Only characters letters, numbers and '_' are  acceptable.");
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    }
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};

6
function get_firstname(){
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    return $("#First_Name").val();
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}

48
hasFirstNameError() {
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  return this.form.hasTextBoxError(FIRSTNAME_FIELD);
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}

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validateLastName() {
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  return this.lastName.invalid && this.lastName.touched
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}

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get firstName() {
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  return this.regFormGroup.get('full_name');
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}

13
function validate()
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{
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    $('#id_password').removeClass("is-invalid");
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    $('#id_password1').removeClass("is-invalid");
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    $('#id_password2').removeClass("is-invalid");
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    $('#id_email').removeClass("is-invalid");
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    if ($("#id_username")[0].value == "" || $("#id_password")[0].value.length == 0)
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        return false;
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    $("#id_email").val($("#id_email")[0].value.toLowerCase());
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    if (!utils.ValidateEmail($("#id_email")[0].value))
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    {
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        $('#id_email').addClass("is-invalid");
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        return false;
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    }
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    if ($("#id_password1")[0].value != $("#id_password2")[0].value)
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    {
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        $('#id_password2').addClass("is-invalid");
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        return false;
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    }
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    return true;
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}