JavaScript script to validate minimum words entered in input - javascript

I really don't know how to do this. So I need a JavaScript script that'd look at the contact form field (question name) and make sure it has more than one word before submitting it.
<input type="text" name="question[name]" id="question_name">
I really searched a lot, found some solutions but non of them really worked.
Can you help me?

Here a fiddle http://jsfiddle.net/6q8jJ/4/
html
<input type="text" name="question[name]" id="question_name">
<button onclick="validate();">send</button>
js
function validate(){
var error = 0,
el = document.getElementById("question_name");
if(el.value.replace(/\s+/g, '').length <= 1){ //get value, remove all whitespace, get length
error++;
}
/*
* etc
* your other validation
*/
if(error > 0) {
alert('mhh...');
}else{
alert('ok send for real');
}
}

<input type="text" name="question[name]" id="question_name" onblur="this.value.split(' ').length < 2 ? alert('you need more words here') : '';" />
jsfiddle
Edit to improve it:
HTML code:
<p>
<input type="text" name="question[name]" id="question_name" onblur="CheckErrors.Name(this);" />
<span class="error"></span>
</p>
JS code:
var CheckErrors = {
Config: {
Error_Strings: {
Name: 'you need more words here',
Email: 'the email looks invalid'
//, ....
}
},
Name: function(element){
try{
var error_target = element.nextElementSibling;
if( element.value.split(' ').length < 2 ){
error_target.textContent = this.Config.Error_Strings.Name;
}
else{
error_target.textContent = '';
}
}
catch(e){
console.log(e.stack);
}
}
//, Email: function(element){}....
};

Related

If statement not working correctly in Javascript

I've written a program that should display an image of a beverage or an alert window depending on the user's age input. The problem is that regardless of what value is submitted it only executes the 'if' portion of the statement. None of the other conditions are being checked prior to execution. I have tried using getElementById with the element id in place of querySelector but the program did not run at at all. I have tried querySelector with the button tag as well as trying the input tag. That also did not work.
function strt() {
let theButton = document.getElementById('aButton');
theButton.addEventListener('click', verifyAge);
}
function verifyAge() {
let patronAge = document.querySelector('age');
let primaryImg = document.getElementById('mainImg');
if (patronAge < 21) {
primaryImg.src = 'images/cola.jpg';
} else if (patronAge >= 21) {
primaryImg.src = 'images/tallboy.jpg';
} else if (patronAge <= 0) {
alert('Please enter a valid number:');
} else if (patronAge == NaN) {
alert('That is not a valid number. Please try again.');
}
}
window.addEventListener('load', strt);
<img src="images/bar&grill.png" alt="barandgrill" id="mainImg">
<br>
<form>
<label for="age">Please enter your age:</label>
<input type="text" id="age" required>
<button id="aButton" type="button">Get Drinks</button>
</form>
Instead of writing this:
let patronAge = document.querySelector('age');
you should write the following:
let patronAge = parseInt(document.querySelector('#age').value);
There are a few problems with your approach.
querySelector('age') looks for an element with tag age, this does not exist. Since you're using querySelector you need to specify a # symbol to search for an id.
You need to access the value of the HTMLElement
You need to parse the value as a number
couple of minor problems. They are pretty easy to spot. Look over the snippet and let me know if you don't understand anything.
function strt() {
let theButton = document.getElementById('aButton');
theButton.addEventListener('click', verifyAge);
}
function verifyAge() {
let patronAge = document.getElementById('age').value;
let primaryImg = document.getElementById('mainImg');
if (patronAge < 21) {
primaryImg.src = 'https://via.placeholder.com/120';
} else if (patronAge >= 21) {
primaryImg.src = 'https://via.placeholder.com/150';
} else if (patronAge <= 0) {
alert('Please enter a valid number:');
} else if (typeof(patronAge) == 'string') {
alert('That is not a valid number. Please try again.');
}
}
window.addEventListener('load', strt);
<img src='https://via.placeholder.com/100' alt="barandgrill" id="mainImg">
<br>
<form>
<label for="age">Please enter your age:</label>
<input type="text" id="age" required>
<button id="aButton" type="button">Get Drinks</button>
</form>

Form validation error message is overriding in javascript (only )

Hope, you all doing well.
I am trying to validate firstname input field of a form with Javascript. For some reason, error messages doesn't display in order. Some of them override others, only just one error message is displaying, the rest is not.
I'm wondering why? Can anyone shed me some light please?
Here is my code:
// Predefined validator function to check if input is empty or not
var validator = {};
validator.isEmpty = function(input) {
// Stop execution if input isn't string
if (typeof input !== 'string') return false;
if (input.length !== 0) {
for (var i = 0; i < input.length; i++) {
if (input[i] !== " ") {
return false;
}
return true;
}
}
return true;
};
validator.isEmpty(null); // returns false
// Main part to get inputs and apply validation
window.onload = function() {
var signUp = document.getElementById("signUp");
var fName = document.getElementById("fName");
var suButton = document.getElementById("subMit");
// Submit button on the function
suButton.addEventListener('click', function(event) {
isNameValid(fName);
});
signUp.addEventListener('submit', function(event) {
event.preventDefault();
});
function isNameValid(char) {
var val = char.value;
if (validator.isEmpty(val)) {
if (val.length < 2) {
// Display a message if input length is less than 2
char.setCustomValidity("We expect your input should contain at least 2 characters, darling !");
char.style.borderColor = "red";
}
if(!isNaN(val)) {
char.setCustomValidity("Please, enter only characters");
char.style.borderColor = "red";
}
} else {
char.setCustomValidity("");
char.style.borderColor = "green";
}
}
<form id="signUp">
<input type="text" id="fName" name="firstname" placeholder="First name">
<input type="checkbox" name="result" required autofocus> Agree our conditions
<input type="submit" id='subMit' value="SUBMIT">
</form>
It took me a while but I hope following works for you. Let me know if you need help understanding anything. I felt your code was a bit complex so I simplified it.
<script>
function submitForm(){
var formValid = false;
var msg = "";
var fNameElement = document.getElementById("fName");
if(fNameElement){
var fNameValue = fNameElement.value;
if(fNameValue.length < 2){
msg = "We expect your input should contain at least 2 characters, darling !";
}
else if(!(/^[a-zA-Z]+$/.test(fNameValue))){
msg = "Please, enter only characters";
}
else{
formValid = true;
}
if(formValid){
fNameElement.style.borderColor="green";
//do something
}
else{
fNameElement.style.borderColor="red";
alert(msg); // or show it in a div
}
}
}
</script>
<form id="signUp" action="javascript:submitForm()">
<input type="text" id="fName" name="firstname" placeholder="First name">
<input type="checkbox" name="result" required autofocus> Agree our conditions
<input type="submit" id='subMit' value="SUBMIT">
</form>
Fiddle: https://jsfiddle.net/fxumcL3d/3/

Form validation woes

New to JS guy here! I feel I have understanding of what my code is doing, but it still won't work.
The bug is (supposedly) with the validation for the phone number form, I have code that -as far as I know- should work (but does not).
Note that I have not got code to validate Address, post code and CC. The Idea is that I can apply your solutions to theses, seeing as they are similar to Phone number.
Also note I did try isNaN, but it was being "weird". Hope thats not too vague, but I'm sure some of you will "know" what I'm talking about.
Here we go (Sorry if my function is a bit long, let me know if its bad practice or whatever.)
Lets stay away from blunt answers if we can? I'd like to know whats wrong so I can fix it myself, walk me through it if you have the mind to be patient :)
JS and HTML:
function detailCheck() {
var phNoLength = document.getElementById('phNo').value.length; //get value for phone number from form for checking
var cardNoLength = document.getElementById('cardNo').value.length; //get value for card number length for checking
var postCodeLength = document.getElementById("postCode").value.length //get value for post code length
var a = /^[A-Za-z]+$/;
var b = /^[-+]?[0-9]+$/;
for (var i = 0; i < 5; i++) {
details = document.getElementById("myForm")[i].value;
if (details === "") {
var i = ("Please enter ALL your details.");
document.getElementById("formTital").innerHTML=i;
return;
} else {
if(phNoLength != 7) {
var i = "Please use a phone number with a length of 7";
document.getElementById("formTital").innerHTML = i;
} else {
if(b.test(document.getElementById("phNo").value)) {
if(postCodeLength === 4){
var f_nameLength = document.getElementById('fName').value.length;
var l_nameLength = document.getElementById('lName').value.length;
if(f_nameLength < 3) {
var i = "First name not long enough"
document.getElementById("formTital").innerHTML=i;
} else {
if(a.test(document.getElementById("fName").value)) {
if(l_nameLength < 3) {
var i = "Last name not long enough"
document.getElementById("formTital").innerHTML=i;
} else {
if(a.test(document.getElementById("lName").value)) {
if(cardNoLength === 4) {
if(isNaN(cardNoLength)) {
var i = "Your card number must be numbers only";
document.getElementById("formTital").innerHTML=i;
} else {
//---- End result ----//
toggleContent();
//--------------------//
}
} else {
var i = "Your card number must have four numbers";
document.getElementById("formTital").innerHTML = i;
}
} else {
var i = "Please only use letters in your last name";
document.getElementById("formTital").innerHTML=i;
}
}
} else {
var i = "Please only use letters in your first name";
document.getElementById("formTital").innerHTML=i;
}
}
} else {
var i = "Please use a post code with a length of four";
document.getElementById("formTital").innerHTML = i;
}
} else {
var i = "only use numbers in your Phone number";
document.getElementById("formTital").innerHTML=i;
}
}
}
}
}
<form id="myForm" action="form_action.asp">
First name: <br> <input class="formInput" type="text" id="fName" name="fName"><br>
Last name: <br> <input class="formInput" type="text" id="lName" name="lName"><br>
Phone Number: <br> <input class="formInput" type="number" id="phNo" name="phNo" maxlength="7"><br>
Credit Card Number: <br> <input class="formInput" type="password" id="cardNo" name="cardNo" maxlength="4"><br>
Address: <br> <input class="formInput" type="text" id="address" name="address"><br>
Post code: <br> <input class="formInput" type="number" id="postCode" name="postCode" maxlength="4"><br>
</form>
It is not obvious when you want the validation to occur (you included a function but it is not clear whether you want it to be an event handler or not).
Your regex seems to be fine. I am including a stripped-down JSFiddle with a single input to which I attached an event handler for keyup and showed the result of .test() for your regex.
See it here.
In regards to your code, it is fairly messy. In terms of form validation. I assume you meant to display a single status message for the user, so you would want to you want to first figure out the priority of your validation. One cleaner option would be to use a function with ordered returns, for example take this pseudo-code:
function getErrorMessage(){
// if name is invalid
// return 'Your name is invalid.';
// if phone is invalid
// return 'Your phone is invalid.';
// ...
// return '';
}
Nesting so many conditional statements can lead to very messy, very non-maintainable spaghetti code. If you are new to Javascript, it is best to learn the best practices early on, as it will save you a lot of headache and facepalms in the future.
If I did not understand your question correctly, please let me know.

Javascript and HTML form validation checks

i am trying to learn html and javascript. I have created an html form and am using javascript to validate the fields. I have a isNaN check for the age field, a regex check for emial and a presence check for all fields. I am currently outputting the form to the address bar but this does not work as i am getting errors.
<title> </title>
<script type="text/javascript">
function validate()
{
var errors = 0;
if (isNumeric(document.getElementById("age").value) == false)
{
errors++;
}
if (emailCheck(document.getElementById("email").value) == false)
{
errors++;
}
var inputBoxes = document.getElementsByTagName('input');
for(var i= 0; i < inputBoxes.length; i++)
{
if(inputBoxes[i].type != 'text') continue;
if(presenceCheck(inputBoxes[i].value) == false)
{
errors++;
}
}
console.log(errors);
if(errors == 0)
{
window.location.assign("output.html#" + "%%" + "name" + "%%" +
document.getElementById("name").value + "%%" + "email" + "%%" +
document.getElementById("email").value + "%%" + "age" + "%%" +
document.getElementById("age").value + "%%" + "comments" + "%%" +
document.getElementById("comments").value);
}
}
function isNumeric(number)
{
return !isNaN(number) && number != null && number != "";
}
function emailCheck(email)
{
var emailRegex = /\s+#\s+.\s+/;
return emailRegex.test(email);
}
function presenceCheck(data)
{
var regex = /\s+/;
return regex.test(data);
}
</script>
Below is the form which is just incased in body tags at the moment
<form id="frmA" name="frmA">
<label name="frmName">Name:</label><br />
<input form="frmA" type="text" name="frmName" id="name"/><br />
<label name="frmEmail">E-Mail:</label><br />
<input form="frmA" type="text" name="frmEmail" id="email"/><br />
<label name="age">Age:</label><br />
<input form="frmA" name="frmAge" id="age"/><br />
<label name="frmComments">Comments:</label><br />
<textarea form="frmA" cols="50" rows="10" id="comments"></textarea><br />
</form>
<button onClick="validate();">Submit</button>
i know that the checks work when no data is present however when i input data in the form and hit submit i am still faced with 4 errors. (there are 5 errors with no data: 3x presence checks, 1 for the regex and one for the isNaN)
My question therefore is why am i still getting errors and why do i get no output.
Any help would be greatly appreciated.
Extra: i would also like the input fields to change colour when there is an error.
Your regexes are wrong. You have /\s+#\s+.\s+/ and it should be /\w+#\w+\.\w+/. You didn't escape the dot and \s matches whitespace, not strings. \w matches word. For a proper email regex you would need much more than that but for your simple case to work this will suffice. The second regex should be /\w+/.

Validation stuck at first validation

I'm new to JavaScript and my form validation works but keeps jumping to validate username on submit even when its validated. Heres my code
function validate_form(form)
{
var complete=false;
if(complete)
{
clear_all();
complete = checkUsernameForLength(form.username.value);
}
if(complete)
{
clear_all();
complete = checkaddress(form.country.value);
}
if(complete)
{
clear_all();
complete = checkaddress(form.country.value);
}
if(complete)
{
clear_all();
complete = checkEmail(form.email.value);
}
if (complete)
{
clear_all();
complete = checkphone(form.phone.value);
}
}
function clear_all()
{
document.getElementById('usernamehint').style.visibility= 'hidden';
/*.basicform.usernamehint.style.backgroundColor='white';*/
document.getElementById("countrthint").style.visibility= 'hidden';
/*document.basicform.countrthint.style.backgroundColor='white';*/
document.getElementById("subhint").style.visibility= 'hidden';
/*document.basicform.subject.style.backgroundColor='white';*/
document.getElementById("phonehint").style.visibility= 'hidden';
/*document.basicform.phone.style.backgroundColor='white';*/
document.getElementById("emailhint").style.visibility= 'hidden';
/*document.basicform.email.style.backgroundColor='white';*/
}
heres the functions
function checkUsernameForLength(whatYouTyped)
{
var fieldset = whatYouTyped.parentNode;
var txt = whatYouTyped.value;
if (txt.length > 2) {
fieldset.className = "welldone";
return true;
}
else
{
fieldset.className = "";
return false;
}
}
function checkEmail(whatYouTyped)
{
var fieldset = whatYouTyped.parentNode;
var txt = whatYouTyped.value;
if (/^\w+([\.-]?\w+)*#\w+([\.-]?\w+)*(\.\w{2,3})+$/.test(txt))
{
fieldset.className = "welldone";
}
else
{
fieldset.className = "";
}
}
function checkaddress(whatYouTyped)
{
var fieldset = whatYouTyped.parentNode;
var txt = whatYouTyped.value;
if (txt.length > 3 && txt.length <10)
{
fieldset.className = "welldone";
}
else
{
fieldset.className = "";
}
}
function checkphone(whatYouTyped)
{
var fieldset = whatYouTyped.parentNode;
var txt = whatYouTyped.value;
if ( /^((\+\d{1,3}(-| )?\(?\d\)?(-| )?\d{1,5})|(\(?\d{2,6}\)?))(-| )?(\d{3,4})(-| )?(\d{4})(( x| ext)\d{1,5}){0,1}$/.test(txt)) {
fieldset.className = "welldone";
}
else
{
fieldset.className = "FAILS";
}
}
function addLoadEvent(func)
{
var oldonload = window.onload;
if (typeof window.onload != 'function')
{
window.onload = func;
} else {
window.onload = function()
{
oldonload();
func();
}
}
}
function prepareInputsForHints()
{
var inputs = document.getElementsByTagName("input");
for (var i=0; i<inputs.length; i++)
{
inputs[i].onfocus = function ()
{
this.parentNode.getElementsByTagName("span")[0].style.display = "inline";
}
inputs[i].onblur = function ()
{
this.parentNode.getElementsByTagName("span")[0].style.display = "none";
}
}
}
addLoadEvent(prepareInputsForHints);
and heres my form
<form form method="post" action="mailto:s00103684#mail.itsligo.ie" name="basicform" id="basicform" >
<fieldset>
<label for="username">Name:</label>
<input type="text" id="username" onkeyup="checkUsernameForLength(this);" />
<span class="hint" id="usernamehint">This Field Must Not Be Left Blank !</span>
</fieldset>
<fieldset>
<label for="country">Country:</label>
<input type="text" id="country" onkeyup="checkaddress(this);" />
<span class="hint" id="countryhint">This Field Must Not Be Left Blank !</span>
</fieldset>
<fieldset>
<label for="Subject">Subject:</label>
<input type="text" id="subject" onkeyup="checkaddress(this);" />
<span class="hint" id="subhint">Please Indicate What Your Interest Is !</span>
</fieldset>
<fieldset>
<label for="Phone">Phone:</label>
<input type="text" id="Phone" onkeyup="checkphone(this);" />
<span class="hint" id="phonehint">This Feld Must Be Numeric Values Only !</span>
</fieldset>
<fieldset>
<label for="email">Email Address:</label>
<input type="text" id="email" onkeyup="checkEmail(this);" />
<span class="hint" id="emailhint">You can enter your real address without worry - we don't spam!</span>
</fieldset>
<input value="send" type="button" onclick="validate_form(this.form)"/>
<br /><br /> <br /><br />
</form>
Please point amateur coder in right direction Thanks
Like others said, you are trying to access the username inside a condition, where the condition is always false. You set complete=false on start and right after that you try to see if that is true.
By the way, clear_all() may not have the behavior you want before the first validation. It will hide every input in the screen, so if there is anything else wrong, you won't be able to see that. I should go for hiding at the end (or at the beginning like #mplungjan stated, and always depending on what you need), maybe reusing your if(complete) structure:
function validate_form(form)
{
clear_all();
var complete = checkUsernameForLength(form.username.value);
if(complete)
{
complete = checkaddress(form.country.value);
}
if(complete)
{
complete = checkEmail(form.email.value);
}
if (complete)
{
complete = checkphone(form.phone.value);
}
}
Also, and after stating the username validation works, you should return a boolean value in the other methods =)
EDIT: Also, checking the errors the others said is a high priority issue.
EDIT2: I turned to see a repeated condition. Now I deleted it. To keep using the if(complete) that way, you should also do these changes:
function checkaddress(whatYouTyped)
{
var fieldset = whatYouTyped.parentNode;
var txt = whatYouTyped.value;
if (txt.length > 3 && txt.length <10)
{
fieldset.className = "welldone";
return true; // <-- this change
}
else
{
fieldset.className = "";
return false; // <-- and this change
}
}
Also, change the other methods to return true and false when you need.
Don't panic.
Everyone has to start somewhere and it can be very frustrating when you're only just learning the ropes.
In answering this question, we need to look not only at your JavaScript, but at the HTML as well.
You don't have a submit input type; instead opting for a regular button. That wouldn't necessarily be a problem, except nowhere in your JavaScript are you actually submitting your form. That means every time someone clicks the "Send" button, it will fire the validate_form() function you've defined but do nothing further with it. Let's make a couple of changes:
Replace your button with a submit input:
<input value="send" type="submit" />
Next, add the following code to your form tag so that we define an action to take when the user tries to submit your form:
onsubmit="validate_form(this)"
So your whole form tag now looks like this:
<form method="post" action="mailto:s00103684#mail.itsligo.ie" name="basicform" id="basicform" onsubmit="return validate_form(this)">
Notice I removed an extra "form" from that element.
Ok, next we want to handle what happens when the form is ready to be validated.
function validate_form(form)
{
// ...we can step through each item by name and validate its value.
var username = checkUsernameForLength(form["username"].value);
var email = checkaddress(form["country"].value);
// ...and so on.
return (username && email && {my other return values});
}
Each method you call (e.g. CheckUsernameForLength) should return either true or false, depending on whether the input is valid or not.
Our last return is probably a little inelegant, but is a verbose example of a way to aggregate our returned values and see if there are any "failed" values in there. If all your methods returned true, that last return will evaluate to true. Otherwise (obviously) it will return false.
The submission of the form will depend on whatever value is returned from your validate_form() function.
Please start with this ( http://jsfiddle.net/4aynr/4/ )
function validate_form(form)
{
var complete=false;
clear_all();
complete = checkUsernameForLength(form.username); // pass the FIELD here
if(complete)
{
complete = checkaddress(form.country.value);
}
if(complete)
{
complete = checkEmail(form.email.value);
}
if (complete)
{
complete = checkphone(form.phone.value);
}
if (!complete) alert('something went wrong')
return complete;
}
and change
<form form method="post" action="mailto:s00103684#mail.itsligo.ie"
name="basicform" id="basicform" >
to
<form method="post" action="mailto:s00103684#mail.itsligo.ie"
name="basicform" id="basicform"
onSubmit="return validate_form(this)">
and change
<input value="send" type="button" onclick="validate_form(this.form)"/>
to
<input value="send" type="submit" />

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