i want my roll number length should be equl to 4 and the data inserted can only be integer..
how can it be possible through java script
i am trying this code but it is just checking it, if roll number is greater then 4 it displays error but also insert the roll number
function rollnumber(elem, min, max){
var uInput = elem.value;
if(uInput.length >= min && uInput.length <= max){
return true;
}else{
alert(" nter between " +min+ " and " +max+ " characters");
elem.focus();
return false;
}
}
rollnumber(document.getElementById('rollnumber'), 1, 4);
return true;
It confuses the javascript rollnumber is both a function name and an element id.
The function needs to be executed on a form when it submits otherwise it will continue submitting instead of stopping
Here is the fixed code. Tested.
<form onsubmit="e_rollnumber()">
<input type="text" id="rollnumber" />
<input type="submit" value="Click here to roll the number" />
</form>
<script type="text/javascript">
function e_rollnumber(){
var len = {min:1,max:4};
var input = document.getElementById('rollnumber');
if(input.value.length>=len.min && input.value.length<=len.max) return true;
alert("Please enter between " +len.min+ " and " +len.max+ " characters");
input.focus();
return false;
};
</script>
Related
I want to create a VAT calculator where the user enters an amount and the amount is multiplied by 1.15 (assume VAT is 15%) and alert message displays the results. So if the user enters an amount of £500, then the alert message should display £575.
function mult(x) {
if (x.length == 0) {
alert("Numbers cannot be blank");
return;
}
if (isNaN(x)) {
alert("Value entered is not numeric");
return;
}
var result = parseInt(x) * 1.15;
alert("Multiplication: " + result);
}
<h1>VAT Calculator</h1><br> Amount(£): <input type="text" id="amount" name="txt_amount">
<br><br>
<button onclick="calculateVAT(amount.value)">Calculate Total Amount</button>
The code of for the javascript is not working.Can you please help me. Thanks.
The error is occurring because when the button is clicked, the code is looking for a function called calculateVAT() which does not exist in the JS.
To resolve the issue, either rename your function called mult() to calculateVAT() or change onClick in the button tag to call the mult() function rather then calculateVAT()
Calculate Total Amount
Rename your function from mult to function calculateVAT(x)
function calculateVAT(x) {
if (x.length == 0) {
alert("Numbers cannot be blank");
return;
}
if (isNaN(x)) {
alert("Value entered is not numeric");
return;
}
var result = parseInt(x) * 1.15;
alert("Multiplication: " + result);
}
<h1>VAT Calculator</h1><br> Amount(£): <input type="text" id="amount" name="txt_amount">
<br><br>
<button onclick="calculateVAT(amount.value)">Calculate Total Amount</button>
I want to write in text box and check if is integer and less than 16 numbers. I have the following JavaScript codes.
<script type="text/javascript">
function doCheck(field) {
if (isNaN(document.getElementById(field).value)) {
alert('this is not a number');
document.getElementById(field).focus();
document.getElementById(field).select();
return false;
}
else {
return true;
}
}
</script>
<form method="post" action="" onsubmit="return doCheck('number');">
national id=<input type="text" name="nat" id="number">
<input type="submit" name="submit">
</form>
document.getElementById(field).value.length
you can find the length of string inside the text box using this
function doCheck(field) {
var len = document.getElementById("number").val().length;
if(parse.Int(document.getElementById(field).value) && len < 16) {
return true;
}
else {
alert('your alert');
document.getElementById(field).focus();
document.getElementById(field).select();
return false;
}
}
be sure you parse it as an integer.
function doCheck(field) {
var input_value = document.getElementById(field).value;
if(isNaN(input_value) || parseInt(input_value,10) != input_value || input_value.length < 16) {
alert('this is not a number');
document.getElementById(field).focus();
document.getElementById(field).select();
return false;
}
else{
return true;
}
}
isNAN() checks whether a number is an illegal number of any type, not only integer. So you have to use something else there, a regular expressions maybe.
To get the length of the field you can simply use:
document.getElementById(field).value.length
my code isn't working for some reason..here it is:
html:
<input type="text" name="post" maxlength="140" />
and for javascript:
var inpt = document.getElementsByName("post")[0];
// var inputValue=document.getElementById(post).value;
if (inpt.value < 10) {
return false;
alert("Post must be longer than 10 characters.");
} else {
return true;
}
i tried it with and without quoting the second line and both do nothing. also i made sure to change inpt.value to inputValue.length when i unquoted the second line.
There are 2 problems
var inpt = document.getElementsByName("post")[0];
//need to test the length
if (inpt.value.length < 10) {
alert("Post must be longer than 10 characters.");
//return after the alert
return false;
} else {
return true;
}
Also make sure that the script is triggered on an event
function validate() {
var inpt = document.getElementsByName("post")[0];
//need to test the length
if (inpt.value.length < 10) {
alert("Post must be longer than 10 characters.");
//return after the alert
return false;
} else {
return true;
}
}
<form onsubmit="return validate()">
<input type="text" name="post" maxlength="140" />
<button>Save</button>
</form>
Put the alert before the return statement.
i have a text box or input to save Phone number, i want that Users Can Only be able to Enter 11 Numbers and Just can accept Numbers Not Characters.
how Check and show message.
how this is possible in client side Like JavaScript And then Sending To Server Side.
my code that it`s Incorrect:
<script language="JavaScript" type="text/javascript">
function code(input){
if(input.length != "11"){
//return false;
alert("Enter a Valid Phone Number");
} else {
return true;
}
}
and in submit section:
<input type=submit border=0 value=" " Onclick=code(getElementById("Phone").value) />
Thanks
you should use return false after alert in validate condition, try this code
function code(input){
if(input.length != "11"){
alert("Enter a Valid Phone Number");
return false;
}
}
UPDATE
If you want to accept only 11 number then try with RegEx
function code(input){
if(input.match(/^[0-9]{11}$/)){
return true;
}
alert("Enter a Valid Phone Number");
return false;
}
submit button change Onclick to onClick with quote and use document.getElementById("Phone").value instead of getElementById("Phone").value
<input type=submit border=0 value=" "
onClick='return code(document.getElementById("Phone").value)' />
<script>
function code(inputd)
{
var phoneno = /^\d{11}$/;
if(inputd.match(phoneno))
{
return true;
}
else
{
alert("error");
return false;
}
}
</script>
<form>
<input type="text" id='Phone'>
<input type="submit" onclick=return code(document.getElementById("Phone").value);>
</form>
Please try this hope it is helpful.
Use jQuery Keypress event to disallow user to enter any character other than number (0-9).
jQuery(function(){
jQuery("#Phone").keypress(function(){
var value = jQuery(this).val();
value = value.replace(/[^0-9]+/g, '');
jQuery(this).val(value);
});
});
Now, in your validation script, check the length
function code(input){
if(input.length != "11"){
alert("Enter a Valid Phone Number");
return false;
}
else {
return true;
}
}
Using jquery is very easy. Try with:
<input type='text' id='phoneNum' border=0 value="" />
<input type='submit' id='submitBtn' border=0 value="" />
<script language="JavaScript" type="text/javascript">
$('#submitBtn').click(function(){
var phoneNum = $('#phoneNum').val();
code(phoneNum);
// other code
});
function code(input){
if(input.length != "11"){
//return false;
alert("Enter a Valid Phone Number");
} else {
return true;
}
}
</script>
Hi sorry i'm still pretty new to javascript.
I've developed a form in HTML and now i'm attempting to add javascript to validate the form.
So far i have simple javascript to make sure each element is filled in,
if (document.order.suburb.value=="")
{
alert("Suburb Cannot Be Empty")
return false
}
if (document.order.postcode.value=="")
{
alert("Postcode Cannot Be Empty")
return false
}
I then have javascript to validate the length of some of the elements,
if (document.order.telephone.value.length < 10)
{
alert("Invalid Telephone Number")
return false
}
Now i'm trying to validate numeric values in the telephone number part but it's not executing correctly, it's like the code is just ignored when it's being executed.
var digits="0123456789"
var temp
var i
for (i = 0 ; i <document.order.telephone.value.length; i++)
{
temp=document.order.telephone.value.substring(i,i+1)
if (digits.indexOf(temp)==-1)
{
alert("Invalid Telephone Number")
return false
}
}
Thanks for reading and thanks for the help :) been stuck on this issue for weeks and have no idea what i'm doing wrong, i tried to code on a separate document with another form and it seemed to work fine.
EDIT
Code for validation for digits in postcode
var post = document.order.postcode.value.replace(white,'');
if(!post){
alert("Post code required !");
return false;
}
post = post.replace(/[^0-9]/g,'');//replace all other than digits
if(!post || 4 > postcode.length) {
alert("Invalid Postcode !");
return false;
}
You may try this example:
var validate = function() {
var white = /\s+/g;//for handling white spaces
var nonDigit = /[^0-9]/g; //for non digits
if(!document.order.suburb.value.replace(white, '')) {
alert("Suburb required !");
return false; //don't allow to submit
}
var post = document.order.postcode.value.replace(white, '')
if(!post) {
alert("Post code required !");
return false;
}
post = post.replace(nonDigit,'');//replace all other than digits
if(!post || 6 > post.length) { //min post code length
alert("Invalid Post code !");
return false;
}
var tel = document.order.telephone.value.replace(white, '');
if(!tel) {
alert("Telephone required !");
return false;
}
tel = tel.replace(nonDigit,'');
if(!tel || 10 > tel.length) {
alert("Invalid Telephone !");
return false;
}
return true; //return true, when above validations have passed
};
<form onsubmit="return validate();" action="#" name="order">
Suburb: <input type="text" id="suburb" name="suburb" ><br/>
Post code: <input type="text" id="postcode" name="postcode"/><br/>
Telephone: <input type="text" id="telephone" name="telephone"/><br/>
<input type="reset"/><input type="submit"/>
</form>
Here is a FIDDLE that will give you something to think about.
You could handle this task in hundreds of ways. I've just used a regex and replaced all of the non-numbers with '' - and compared the length of two variables - if there is anything other than a number the length of the regex variable will be shorter than the unchanged mytelephone.
You can do all kinds of "validation" - just me very specific in how you define "valid".
JS
var mysuburb, mypostcode, mytelephone;
$('.clickme').on('click', function(){
mysuburb = $('.suburb').val();
mypostcode = $('.postcode').val();
mytelephone = $('.telephone').val();
console.log(mysuburb + '--' + mypostcode + '--' + mytelephone);
if(mysuburb.length < 1)
{
$('.errorcode').html('');
$('.errorcode').append('Suburb is required');
return false;
}
if(mypostcode.length < 1)
{
$('.errorcode').html('');
$('.errorcode').append('postode is required');
return false;
}
if( mytelephone.length < 1 )
{
$('.errorcode').html('');
$('.errorcode').append('telephone number is required');
return false;
}
if( mytelephone.length != mytelephone.replace(/[^0-9]/g, '').length)
{
$('.errorcode').html('');
$('.errorcode').append('telephone number must contain only numbers');
return false;
}
});