<form action="" method="post" name="frm" onsubmit="return check()">
<input type="text" name="val[]" class="bla">
<input type="text" name="val[]" class="bla">
<input type="text" name="val[]" class="bla">
<input type="text" name="val[]" class="bla">
<input type="submit" value="send">
</form>
i want to using javascript validation
check(){
// if array elements duplicate return false and show error ?
}
inputs maybe empty , not required , i found that this javascript function , but I could not adapt.
function checkIfArrayIsUnique(arr) {
var map = {}, i, size;
for (i = 0, size = arr.length; i < size; i++){
if (map[arr[i]]){
return false;
}
map[arr[i]] = true;
}
return true;
}
Related
<script>
function myFunction(val) {
const ele = document.querySelectorAll('input');
let sum = 0;
ele.forEach(input => {
sum += input.value ? parseFloat(input.value) : 0;
});
document.getElementById('result').textContent = sum.toFixed(2);
}
</script>
<form action="test.php" method="POST" enctype="multipart/form-data">
<input type="text" id="array[]" class="input" oninput="myFunction(this.value)">
<input type="text" id="array[]" class="input" oninput="myFunction(this.value)">
<p id="result"></p>
<br>
<p><input type="submit" name= "submit" id="submit" value="Submit"/></p>
</form>
Why the result is NaN? But if I remove the value="Submit" in the last 5th line, then everything working fine. Why? and what should I do to solve this problem?
Your
const ele = document.querySelectorAll('input');
will iterate over all inputs, including the <input type="submit" name= "submit" id="submit" value="Submit"/>.
When you don't use value="Submit", that element doesn't have a real .value, so it defaults to the empty string:
console.log(submit.value);
console.log(submit.value.length);
<input type="submit" name="submit" id="submit">
In contrast, <input value="Submit"/> will have a .value of Submit, which can't be turned into a number.
Select only your inputs with input classes instead:
function myFunction() {
const ele = document.querySelectorAll('input.input');
let sum = 0;
ele.forEach(input => {
sum += input.value ? parseFloat(input.value) : 0;
});
document.getElementById('result').textContent = sum.toFixed(2);
}
<form action="test.php" method="POST" enctype="multipart/form-data">
<input type="text" id="array[]" class="input" oninput="myFunction(this.value)">
<input type="text" id="array[]" class="input" oninput="myFunction(this.value)">
<p id="result"></p>
<br>
<p><input type="submit" name="submit" id="submit" value="Submit" /></p>
Also note that duplicate IDs are invalid HTML, and event handlers should be attached properly using Javascript instead of using inline handlers:
const inputs = document.querySelectorAll('input.input');
inputs.forEach((input) => {
input.addEventListener('keydown', () => {
const sum = [...inputs].reduce((a, input) => a + Number(input.value), 0);
document.getElementById('result').textContent = sum.toFixed(2);
});
});
<form action="test.php" method="POST" enctype="multipart/form-data">
<input type="text" class="input">
<input type="text" class="input">
<p id="result"></p>
<br>
<p><input type="submit" value="Submit"></p>
</form>
Because you are selecting all the input tag, you should be specific on selecting like querySelectorAll('input[type="text"]'). so it will select only text input tags. Try this one
<!DOCTYPE html>
<html>
<body>
<script>
function myFunction(val) {
const ele = document.querySelectorAll('input[type="text"]');
let sum = 0;
ele.forEach(input => {
sum += input.value ? parseFloat(input.value) : 0;
});
document.getElementById('result').textContent = sum.toFixed(2);
}
</script>
<form action="test.php" method="POST" enctype="multipart/form-data">
<input type="text" id="array[]" class="input" oninput="myFunction(this.value)">
<input type="text" id="array[]" class="input" oninput="myFunction(this.value)">
<p id="result"></p>
<br>
<p><input type="submit" name= "submit" id="submit" value="Submit"/></p>
</form>
</body>
</html>
Because document.querySelectorAll('input'); selecting all inputs including submit button as well which has value='submit' and value submit is not a number (NAN). When you remove value attribute from the submit button it returns nothing.
I'm trying to validate my form through JavaScript and instead of manually checking each radio button I decided to loop through a group of radio buttons and check to see if they were checked or not.
I'm simply trying to see if a group of radio buttons is checked or not. But the problem I'm facing is. It's returning both true and false when I check either of them. If I don't check either, they both return false but if I check one, it returns true and false.
Here is my code:
function validateForm(){
let firstliGroup = document.getElementsByName("yesnocheck");
for(i=0; i<firstliGroup.length; i++){
//console.log(firstliGroup[i].checked);
if(firstliGroup[i].checked == true){
console.log('success');
return true;
}
else {
console.log('failed');
return false;
}
}
}
<form name="driverkeylistform" method="post" onsubmit="return validateForm()">
<fieldset id="group1">
<input type="radio" name="yesnocheck" value="Yes"><span>Yes</span>
<input type="radio" name="yesnocheck" value="No"><span>No</span>
</fieldset>
<input type="submit" value="Send">
</form>
Try this:
function getRadioValue(name) {
let elements = document.getElementsByName(name);
for (let i = 0; i < elements.length; i++) {
if (elements[i].checked) {
return elements[i].value;
}
}
return null;
}
function validateForm() {
var yesnocheck = getRadioValue("yesnocheck");
console.log(yesnocheck);
return false;
}
If nothing is checked, then getRadioValue function will return null.
If any option was checked, it will return it's value.
Try using document.forms[0].yesnocheck.
function validateForm()
{
return (document.forms[0].yesnocheck.value.length > 0 &&
document.forms[0].yesnoremote.value.length > 0 &&
document.forms[0].yesnocable.value.length > 0 &&
document.forms[0].condition.value.length > 0);
}
<form name="driverkeylistform" method="post" onsubmit="return validateForm()">
<fieldset id="group1">
<input type="radio" name="yesnocheck" value="Yes"><span>Yes</span>
<input type="radio" name="yesnocheck" value="No"><span>No</span>
</fieldset>
<label for="gateremote">Gate remote batteries checked?:</label>
<input type="radio" name="yesnoremote" value="Yes"><span>Yes</span>
<input type="radio" name="yesnoremote" value="No"><span>No</span>
<label for="internetcabletv">Internet and Cable TV checked?:</label>
<input type="radio" name="yesnocable" value="Yes"><span>Yes</span>
<input type="radio" name="yesnocable" value="No"><span>No</span>
<label for="unitcondition">Unit Condition?:</label>
<input type="radio" name="condition" value="clean"><span>Clean</span>
<input type="radio" name="condition" value="light"><span>Light</span>
<input type="radio" name="condition" value="heavy"><span>Heavy</span>
<input type="radio" name="condition" value="superheavy"><span>SuperHeavy</span>
<input type="submit" value="Send">
</form>
Friends, I want the sum of the numbers I put in fields and these input value total are equal to my total value. it show a Nan Error When i add these input values please help
This is my body Content
<form action="" method="post">
<input type="text" name="cnum" placeholder="enter no. of input">
<input type="submit" name="submit" >
</form>
<?php
if(isset($_POST['cnum']))
{
$cnum=$_POST['cnum'];
$i=0;
?>
<form action="" method="post">
<input type="hidden" name="total" id="total" value="10">
<input type="hidden" name="cnum" id="cnum" value="<?php echo $cnum ;?>">
<?php
while($i<$cnum)
{
?>
<input type="number" id="aq<?php echo $i; ?>" onKeyup="add()" name="aq<?php echo $i; ?>"><br />
<?php
$i++;
}
?>
<input type="submit" name="aqsub">
</form>
<?php
}
?>
This is my java script function
var val=0;
var total=document.getElementById('total').value;
var cnum=document.getElementById('cnum').value;
var anum;
function add()
{
var n=0;
while(n<cnum)
{
anum = 0;
if(document.getElementById('aq'+n).value != "") {
anum=parseInt(document.getElementById('aq'+n).value);
}
val += anum;
n++;
}
alert(val);
}
Update JS part:
var total=document.getElementById('total').value;
total = parseInt(total);
var cnum=document.getElementById('cnum').value;
cnum= parseInt(cnum);
function add()
{
var anum;
var val=0;
var n=0;
while(n<cnum)
{
anum = 0;
var temp = document.getElementById('aq'+n).value;
if( temp != "") {
anum=parseInt(temp);
}
val = +val + anum;
n++;
}
alert(val);
}
var total=document.getElementById('total').value;
total = parseInt(total);
var cnum=document.getElementById('cnum').value;
cnum= parseInt(cnum);
function add()
{
var anum;
var val=0;
var n=0;
while(n<cnum)
{
anum = 0;
var temp = document.getElementById('aq'+n).value;
if( temp != "") {
anum=parseInt(temp);
}
val = +val + anum;
n++;
}
alert(val);
}
<form action="" method="post">
<input name="total" id="total" value="10" type="hidden">
<input name="cnum" id="cnum" value="10" type="hidden">
<input id="aq0" onkeyup="add();" name="aq0" value="" type="number"><br>
<input id="aq1" onkeyup="add();" name="aq1" value="" type="number"><br>
<input id="aq2" onkeyup="add();" name="aq2" value="" type="number"><br>
<input id="aq3" onkeyup="add();" name="aq3" value="" type="number"><br>
<input id="aq4" onkeyup="add();" name="aq4" value="" type="number"><br>
<input id="aq5" onkeyup="add();" name="aq5" value="" type="number"><br>
<input id="aq6" onkeyup="add();" name="aq6" value="" type="number"><br>
<input id="aq7" onkeyup="add();" name="aq7" value="" type="number"><br>
<input id="aq8" onkeyup="add();" name="aq8" value="" type="number"><br>
<input id="aq9" onkeyup="add();" name="aq9" value="" type="number"><br>
Add Following code in your javascript
cnum = parseInt(cnum);
Update code as:
var total= parseInt(document.getElementById('total').value);
As you are using total to comparing with anum. so must be error Nan for total
Well I don't understand your logic but you get NAN because your value of fields are blank.
try this code
var val=0;
var total=document.getElementById('total').value;
var cnum=document.getElementById('cnum').value;
var anum;
function add()
{
var n=0;
while(n<cnum)
{
anum = 0;
if(document.getElementById('aq'+n).value != "") {
anum=parseInt(document.getElementById('aq'+n).value);
}
val += anum;
n++;
}
if(total==anum)
{
alert('Its Work');
}
else
{
alert('Its not Work');
}
}
why dont you directly include the PHP var into a JS var?
var cnum=<?php echo $cnum ;?>;
Also may check against "", and then use a zero
parseInt(input.value)||0;
I'm trying to validate a form by passing the form node through a constructor. I know using OO is a bit over the top but it's a request. I've got the code below, but when I try to alert out the values of the text boxes in function(form), they are coming up as undefined.
<SCRIPT LANGUAGE="JavaScript">
function Validator(fields) {
this.fields = fields;
}
Validator.prototype.validate = function (form) {
for (var i = 0, l = this.fields.length; i < l; i++) {
alert(this.fields[i].value);
if (this.fields[i].value == 0) {
alert("The field is empty");
return false;
}
}
}
var validator = new Validator(["username", "password"]);
function runValidate(form) {
validator.validate(form);
}
</SCRIPT>
</head>
<body>
<form NAME="AbbeyRoad">
<fieldset>
<legend>Please login</legend>
<div class="form-element">
<label for="username"><span class="shortkey">U</span>sername:</label>
<input type="text" name="username" id="username" accesskey="u">
</div>
<div class="form-element">
<label for="password"><span class="shortkey">P</span>assword:</label>
<input type="password" name="password" id="password" accesskey="p">
</div>
<input type="button" name="login" value="Login" id="login" onClick="runValidate(this.form)">
</fieldset>
</form>
Change:
alert(this.fields[i].value);
to:
alert(form[this.fields[i]].value);
and this:
if (this.fields[i].value == 0) {
to:
if (form[this.fields[i]].value == 0) {
<pre>
<script>
// here i want to check form validation
//if i use for loop txtbox2 is not exist in my form so i am getting Js error
//Don't write individual validation
//check element is exist or not if exist check for validation
//I need know how to check an element is exist or not
</script>
<form
<input type="text" id="txtbox1" name="txtbox1" />*
<input type="text" id="txtbox3" name="txtbox3" />*
<input type="text" id="txtbox4" name="txtbox4" />*
<input type="text" id="txtbox5" name="txtbox5" />*
<input type="text" id="txtbox15" name="txtbox15" />*
<input type="text" id="txtbox28" name="txtbox28" />*
</pre>
Apply a class to them:
<input type="text" id="txtbox1" name="txtbox1" class="txt" />
<input type="text" id="txtbox3" name="txtbox3" class="txt" />
<input type="text" id="txtbox4" name="txtbox4" class="txt" />
<input type="text" id="txtbox5" name="txtbox5" class="txt" />
<input type="text" id="txtbox15" name="txtbox15" class="txt" />
<input type="text" id="txtbox28" name="txtbox28" class="txt" />
and go about like this:
function validate(){
var elms = document.getElementsByTagName('input');
for (var i = 0; i < elms.length; i++){
if (elms[i].className === 'txt'){
if (elms[i].value === ''){
alert('Make sure to fill in all required fields');
// now focus it
elms[i].focus();
return false;
}
}
}
return true;
}
And then call the above function like this:
<form ............ onsubmit="return validate();">
Post your code.
Easiest way to validate is by using jquery validate plugin.(Why write your own code when somebody else has done the same?).
An example
<script type="text/javascript" src="http://code.jquery.com/jquery-1.5.1.js"></script>
<script type="text/javascript" src="http://ajax.microsoft.com/ajax/jquery.validate/1.7/jquery.validate.min.js"></script>
<script type="text/javascript">
$(document).ready(function() {
$("#feedbackform").validate();
});
</script>
<body>
<form id = "feedbackform" method = "POST" action = "">
<h3><span>Contact Us</span></h3>
<fieldset>
<legend>Contact form</legend>
<label for="id_name">Name *</label>
<input id="id_name" class="required" type="text" name="name" />
<label for="id_email">Email</label>
<input id="id_email" type="email" name="email" class="email"/>
<label for="id_comments">Message *</label>
<textarea id="id_comments" class="required" name="comments"></textarea>
<button type="submit">Send</button>
</fieldset>
</form>
The elements that you want to validate add class="required". I hope the example provided is self-explainatory
You can get a reference to the element and check if the reference is null or not:
for (var i=1; i<=100; i++) {
var elem = document.getElementById('txtbox' + i);
if (elem != null) {
...
}
}
Another approach is to look at the elements in the form, but then you need a way to access the form of course:
var elems = document.getElementById('IdOfTheForm').elements;
for (var i=0; i<elems.length; i++) {
var elem = elems[i];
if (elem.tagName == 'INPUT' && elem.type == 'text' && elem.id.length > 6 && elemt.id.substr(0,6) == 'txtbox') {
...
}
}