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get value of input and redirect to that url which is in the textbox

I have one input textbox and button on my page. actually what I want is --- on click of the button if the textbox is not empty then redirect to URL which is in the textbox... and it should also be redirected when we press enter key in the textbox. I need javascript function for that... I tried many things.. I am totally new...
<input type="text" name="url" id="editbox_search" />
<input type="submit" value="Submit" />
I have tried
function doKey(e) {
if (event.keyCode == 13) {
var x = document.getElementById('<%=editbox_search.ClientID%>');
var val = x.value;
if (val == "") {
return false;
}
else {
window.location = <%= Page.ResolveUrl("~/")%>+'Search/'+val;
}
return false;
}
}

Use:
window.location.replace(newUrl);
Or:
window.location.href = newUrl;

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/

Remove form error with correct input

I just made a registration form which will tell you in red(CSS) letters if something is wrong. However I want this text to go away as soon as the user writes it correctly. How do I do that?
<script>
function validateForm2() {
var usrnm2 = document.getElementById("usrnm2").value;
var passw2 = document.getElementById("passw2").value;
var cnfpassw2 = document.getElementById("cnfpassw2").value;
var age = document.getElementById("age").value;
if (usrnm2 == null || usrnm2 == "") {
document.getElementById("error1").innerHTML = "You must enter a username";
return false;
}
else if (passw2 == null || passw2 == "") {
document.getElementById("error2").innerHTML = "You must enter a password";
return false;
}
else if (cnfpassw2 !== passw2) {
document.getElementById("error3").innerHTML = "Password does not match";
return false;
}
else if (age < 18) {
document.getElementById("error4").innerHTML = "You are not old enough to enter this site"
return false;
}
else {
alert("Congratulations, you have registered successfully!")
}
}
</script>
<script>
function register2() {
validateForm2()
}
</script>
<form>
Username:
<input id="usrnm2" type="text" name="username"><p id="error1"></p>
Password
<input id="passw2" type="password" name="password"><p id="error2"></p>
Confirm Password
<input id="cnfpassw2" type="password" name="confirmpw2"><p id="error3"></p>
Age
<input id="age" type="number" name="age"><p id="error4"></p><br />
<input id="bttn2" type="button" value="Register!" onclick="register2()"><br />
</form>

Separate the validation conditions into single block if statements, and then include a handler for returning the fields to normal when they are entered correctly:
if (field is entered incorrectly) {
document.getElementById("error").innerHTML = "You must enter correctly";
return false;
}
else {
document.getElementById("error").innerHTML = "";
}
...
alert("Congratulations, you have registered successfully!");
You simply need to place the alert after all of the statements - it will execute as long as none of the conditions fail and thus return.

Javascript form validation needs fix

I'm trying to make a basic form validation but it's not working. I need to make it in such a way that after validation is passed, THEN ONLY it submits the form. I'm not sure how to do it though. My code is below.
[Important request]
** I'm actually pretty new to this so if possible I would like to get some concrete information/explanation concerning the DOM and how to manipulate it and style it (W3School is NOT helping) **
<form id="reg" method="POST" action="user.php" onsubmit="return validate()">
<label for="first">First Name: </label>
<input id="first" name="first" type="text" value="">
<label for="last">Last Name: </label>
<input id="last" name="last" type="text" value="">
<button type="submit">Register</button>
</form>
function validate(){
if(document.getElementById('first').value == ""){
alert('First Name Blank!');
return false;
}else{
return true;
}
if(document.getElementById('last').value == ""){
alert('Last Name Blank!');
return false;
}else{
return true;
}
}
Thanks

Try this:
function validate() {
var validForm = true;
var msg = '';
if (document.getElementById('first').value == "") {
msg += 'First Name Blank! ';
validForm = false;
}
if (document.getElementById('last').value == "") {
msg += 'Last Name Blank! ';
validForm = false;
}
if (!validForm) {
alert(msg);
}
return validForm;
}
Plunker example

Your validation function only validates the first name. Whether it's valid or not, the function returns before checking the last name.
function validate(){
if(document.getElementById('first').value == ""){
alert('First Name Blank!');
return false; // WILL RETURN EITHER HERE ...
}else{
return true; // ... OR HERE
}
The return statement will exit the function at the point it appears, and other code after that is simply not executed at all.
Instead of doing it that way, keep a flag that determines whether the fields are all OK:
function validate(){
var isValid = true; // Assume it is valid
if(document.getElementById('first').value = ""){
alert('First Name Blank!');
isValid = false;
}
if(document.getElementById('last').value == ""){
alert('Last Name Blank!');
isValid = false;
}
return isValid;
}

Here's the code to check for validation and stop it from submitting if it is incorrect data.
<form id="reg" method="POST" action="user.php">
<label for="first">First Name: </label>
<input id="first" name="first" type="text" value="">
<label for="last">Last Name: </label>
<input id="last" name="last" type="text" value="">
<button type="button" id="submit">Register</button>
</form>
document.getElementById('submit').onclick = function(){
if(validate()){
document.getElementById('reg').submit();
}
}
function validate(){
if(document.getElementById('first').value == ""){
alert('First Name Blank!');
return false;
}else if(document.getElementById('last').value == ""){
alert('Last Name Blank!');
return false;
}else{
return true;
}
}
All I have done here is made the submit button a regular button and handled submitting via JS, When an input of type submit is clicked the page will submit the form no matter what. To bypass this you can make it a regular button and make it manually submit the form if certain conditions are met.

Your javascript code can be:
document.getElementById('submit').onclick = function () {
if (validate()) {
document.getElementById('reg').submit();
}
}
function validate() {
if (document.getElementById('first').value == "") {
alert('First Name Blank!');
return false;
} else if (document.getElementById('last').value == "") {
alert('Last Name Blank!');
return false;
} else {
return true;
}
}

JavaScript form validation on server/local

I'm using JavaScript form validation for the entry form for a contest I'm running. It's inline CSS so that if certain conditions aren't met, it displays, in red, messages that say "please enter your email address" or "that doesn't look like a valid email address" etc.
The script, which sits at the top of the file, looks like this:
<script>
function checkForm() {
name = document.getElementById("name").value;
email = document.getElementById("email").value;
terms = document.getElementById("terms").value;
if (name == "") {
hideAllErrors();
document.getElementById("nameError").style.display = "inline";
document.getElementById("name").select();
document.getElementById("name").focus();
return false;
} else if (email == "") {
hideAllErrors();
document.getElementById("emailError").style.display = "inline";
document.getElementById("email").select();
document.getElementById("email").focus();
return false;
}
else if (!check_email(document.getElementById("email").value)) {
hideAllErrors();
document.getElementById("emailError2").style.display = "inline";
document.getElementById("email").select();
document.getElementById("email").focus();
return false;
}
else if (!document.form1.terms.checked){
hideAllErrors();
document.getElementById("termsError").style.display = "inline";
document.getElementById("terms").select();
document.getElementById("terms").focus();
return false;
}
return true;
}
function check_email(e) {
ok = "1234567890qwertyuiop[]asdfghjklzxcvbnm.#-_QWERTYUIOPASDFGHJKLZXCVBNM";
for(i=0; i < e.length ;i++){
if(ok.indexOf(e.charAt(i))<0){
return (false);
}
}
if (document.images) {
re = /(#.*#)|(\.\.)|(^\.)|(^#)|(#$)|(\.$)|(#\.)/;
re_two = /^.+\#(\[?)[a-zA-Z0-9\-\.]+\.([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$/;
if (!e.match(re) && e.match(re_two)) {
return (-1);
}
}
}
function hideAllErrors() {
document.getElementById("nameError").style.display = "none"
document.getElementById("emailError").style.display = "none"
document.getElementById("commentError").style.display = "none"
document.getElementById("termsError").style.display = "none"
}
The email and name validation work just fine, the part of the form that won't work looks like this:
<form onSubmit="return checkForm();" method="get" action="sweepstakes-results.php"
<input type=checkbox name=terms id=terms ><br></p>
<div class=error id=termsError>Required: Please check the checkbox<br></div>
<p><input type=submit value=Send style="margin-left: 50px"> </p>
</form>
The "terms and conditions" checkbox only works if the file is on my local machine, when I upload it, it just lets me submit the form even if it's not checked. Isn't JavaScript run on the browser? How could the location of the file make a difference?

Your form doesn't have a name, so the following code won't work:
else if (!document.form1.terms.checked){
Since you're already retrieving the DOM object of the checkout, do the following. Change the line:
terms = document.getElementById("terms").value;
to:
terms = document.getElementById("terms");
And the replace that else if code with:
else if (!terms.checked){