I'm trying to implement a function that will bring up an alert box when a date in the wrong format is entered and the submit button is pressed. I have six date fields in my form.
I can't seem to find regex examples that show me how to implement the function in my field inputs only how to do the function itself. I wanted to restrict it to YYYY-MM-DD. Posting here is the last resort for me, I have looked for a long time to no avail. Please can someone help?
function validate_date() {
var date_regex = /^(0[1-9]|1[0-2])\/(0[1-9]|1\d|2\d|3[01])\/(19|20)\d{2}$/ ;
if(!(date_regex.test(testDate)))
{
alert('Wrong format!');
return false;
}
}
<input type="text" class="form-control" id="empexpiry" style="width:350px;" placeholder="Nothing on File" name="empexpiry" value=""
If I was you I would use some plugin. There are good vanilla and jQuery plugins to validate forms (e.g. Vanilla, jQuery).
But if you wanna do it by yourself:
Listen to the submit event of the form and validate all your entries using regex
The function to validate could be something like this
function isDateValid (dateStr) {
let isValid = dateStr.match(/[0-9]{4}-[0-9]{2}-[0-9]{2}/)
if (!isValid) return false
const dateObj = new Date(dateStr);
isValid = dateObj != 'Invalid Date'
return isValid
}
And your function to listen the submit could be something like this:
function validateForm (e) {
const input1 = document.getElementById("input1").text
if (!isDateValid(input1)) {
alert('invalid')
e.preventDefault()
return false
}
/* And so on */
}
I found out that the HTML5 pattern attribute was all that was required. Simple!
<input id="date" type="text" pattern="\d{4}-\d{1,2}-\d{1,2}" oninvalid="setCustomValidity('Please make sure the date follows this format: YYYY-MM-DD')" required="required"/>
Related
Note: to the best of my knowledge this question is not a duplicate question of the following:
HTML5: Why does my “oninvalid” attribute let the pattern fail?
HTML5 form required attribute. Set custom validation message?
How can I change or remove HTML5 form validation default error messages?
Overview
Given a field that:
Has pattern attribute set for validation, for example "[a-f,0-9]{4}" for a 4 character hex string input.
Has oninvalid set with setCustomValidity('...some message...') to define a custom validation message
Has oninput set with setCustomValidity('') to reset on input
Here is an example showing this:
/* jshint esnext: true */
const form = document.querySelector("#form");
const field = document.querySelector("#field");
const output = document.querySelector("#output");
form.addEventListener('submit', (e) => {
console.log("SUBMIT");
output.textContent = field.value;
e.preventDefault(); // Prevent default POST request
});
field.oninvalid = (event) => {
console.log("INVALID");
event.target.setCustomValidity('must be valid 4 hex characters');
}
field.oninput = (event) => {
console.log("INPUT");
event.target.setCustomValidity('');
}
Output: <span id="output">No output</span>
<form id="form">
<label for="field">Enter 4 character hex code: </label>
<input id="field" type="text" pattern="[a-f,0-9]{4}" autocomplete=off>
</form>
Validation works almost as desired, except when the user enters an invalid entry and then proceeds to try and edit it, where their following input states are still invalid:
At this point, neither the custom setCustomValidity message defined in oninvalid is used, nor the empty one defined in onInput.
Instead, as long as the field is in an invalid state and not blurred, the default Please match the requested format. message appears.
Question
What is going on here? Looking at the console, the oninput event is called each time, and therefore event.target.setCustomValidity(''); is called each time.
So why is it that we are still seeing the generic default validation message? Shouldn't setCustomValidity('') disable that?
An acceptable answer here should exhibit the following:
The parameter field is respected for validation.
Any validation message appears if and only if the user attempts to submit an invalid field and not when they modify the input immediately afterward.
The default Please match the requested format. message never appears at all.
It appears that this is a bug with Chrome 65 in windows.
using setCustomValidity('') in oninput should disable the default validation messages appearing on input.
The following workaround works for me:
/* jshint esnext: true */
const form = document.querySelector("#form");
const field = document.querySelector("#field");
const output = document.querySelector("#output");
const pattern = field.getAttribute("pattern");
form.addEventListener('submit', (e) => {
console.log("SUBMIT");
output.textContent = `User submitted: ${field.value}`;
e.preventDefault(); // Prevent default POST request
});
field.oninvalid = (event) => {
console.log("INVALID");
event.target.setCustomValidity('must be valid 4 hex characters');
}
field.oninput = (event) => {
console.log("INPUT");
event.target.setCustomValidity('');
event.target.removeAttribute("pattern");
}
field.onchange = (event) => {
console.log("CHANGE");
event.target.setAttribute("pattern", pattern);
}
Output: <span id="output">No output</span>
<form id="form">
<label for="field">Enter 4 character hex code: </label>
<input id="field" type="text" pattern="[a-f,0-9]{4}" autocomplete=off>
</form>
setCustomValidity is meant to be used when multiple inputs, in combination are invalid. That is why it has to be reset to the empty string manually after. Other wise the title attribute should be used.
Trying to hide the validation error after editing the input is understandable but it is against the HTML5 form philosophy. It is meant to be shown as long as the input is invalid.
Adding maxlength can help the user to not cross the upper limit.
If you really want your bullet points to be satisfied feel free to not use HTML5 form validation but something custom instead.
So the reason a tooltip is shown even when setCustomValidity is set to empty string is because the input element is still invalid as per pattern attribute.
<form id="form">
<label for="field">Enter 4 character hex code: </label>
<input id="field" type="text" pattern="[a-f,0-9]{4}" maxlength="4" minlength="4" autocomplete="off" title="must be valid 4 hex characters">
</form>
JS
const form = document.querySelector("#form");
const field = document.querySelector("#field");
const output = document.querySelector("#output");
form.addEventListener('submit', (e) => {
console.log("SUBMIT");
output.textContent = field.value;
e.preventDefault(); // Prevent default POST request
});
field.oninvalid = (event) => {
console.log("INVALID");
}
field.oninput = (event) => {
console.log("INPUT");
}
I just started learning JS, Jquery and HTML online. I have a question, and have tried doing things which were told in the answers of similar questions on SO, but it won't help.
I have a password form which only accepts input which have atleast 6 characters, one uppercase letter and one number. I wish to show a custom validation message which could just state these conditions again.
Here's my HTML code -
<div class="password">
<label for="password"> Password </label>
<input type="password" class="passwrdforsignup" name="password" required pattern="(?=.*\d)(?=.*[A-Z]).{6,}"> <!--pw must contain atleast 6 characters, one uppercase and one number-->
</div>
I'm using JS to set the custom validation message.
JS code
$(document).ready(function () {
$('.password').on('keyup', '.passwrdforsignup', function () {
var getPW = $(this).value();
if (getPW.checkValidity() === false) {
getPW.setCustomValidity("This password doesn't match the format specified");
}
});
});
However, the custom validation message doesn't show. Please help. Thank you so much in advance! :)
UPDATE 1
I changed the password pattern to (?=.*\d)(?=.*[A-Z])(.{6,}). Based on 4castle's advise, I realized there were a few errors in my javascript, and changed them accordingly. However, the custom validation message still doesn't show.
JavaScript:
$(document).ready(function () {
$('.password').on('keyup', '.passwrdforsignup', function () {
var getPW = $(this).find('.passwrdforsignup').get();
if (getPW.checkValidity() === false) {
getPW.setCustomValidity("This password doesn't match the format specified");
}
});
});
Again, than you all in advance!
First, update this:
var getPW = $(this).find('.passwrdforsignup').get();
to this:
var getPW = $(this).get(0);
...because $(this) is already the textbox .passwrdforsignup, you can't find it in itself!
The problem with setCustomValidity is, that it does only work once you submit the form. So there is the option to do exactly that:
$(function () {
$('.password').on('keyup', '.passwrdforsignup', function () {
var getPW = $(this).get(0);
getPW.setCustomValidity("");
if (getPW.checkValidity() === false) {
getPW.setCustomValidity("This password doesn't match the format specified");
$('#do_submit').click();
}
});
});
Please note the getPW.setCustomValidity(""); which resets the message which is important because if you do not do this, getPW.checkValidity() will always be false!
For this to work the textbox (and the submit-button) must be in a form.
Working JSFiddle
There are several issues going on here.
The pattern doesn't have a capture group, so technically nothing can ever match it. Change the pattern to (?=.*\d)(?=.*[A-Z])(.{6,})
$(this).value() doesn't refer to the value of the input tag, it's referring to the value of .password which is the container div.
getPW.checkValidity() and getPW.setCustomValidity("blah") are getting run on a string, which doesn't have definitions for those functions, only DOM objects do.
Here is what you should do instead (JS code from this SO answer)
$(document).ready(function() {
$('.passwrdforsignup').on('invalid', function(e) {
var getPW = e.target;
getPW.setCustomValidity("");
if (!getPW.checkValidity())
getPW.setCustomValidity("This password doesn't match the format specified");
}).on('input', function(e) {
$(this).get().setCustomValidity("");
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<form>
<div class="password">
<label for="password">Password</label>
<input type="password" class="passwrdforsignup" name="password"
required pattern="(?=.*\d)(?=.*[A-Z])(.{6,})" />
</div>
<input type="submit" />
</form>
im learning angular and right now i created input (type:text) which should display date, and it have ui.mask like "99/99/9999", it has validation in module to not pass (unblock button) if there is a wrong date , i mean ex: 00/00/0000 or 12/12/1700, but the input dont show red frame, it displays like it is valid format, how can i show red frame based on module validation?
HTML
<input
id="dob"
type="text"
class="form-control cell-height form-input"
ng-model="createAccount.dob"
ui-mask="99/99/9999"
placeholder="D.O.B. (mm/dd/yyyy)"
required/>
CONTROLLER
var validateDob = function () {
try {
var date = moment.utc($scope.createAccount.dob, "MM/DD/YYYY");
if ($scope.patient == null) $scope.patient = {};
if (!date.utc().isValid()) return false;
if (date.utc().date() == 0 || date.utc().year() == 0) return false;
if (date.utc().isAfter(moment().utc())) return false;
if (date.utc().isSame(moment().utc())) return false;
if (!date.utc().isAfter(moment.utc().subtract(150, 'years'))) {
return false;
}
$scope.createAccount.dateOfBirth = date.utc();//.format("YYYY/MM/DD");
return true;
}
catch (err) {
return false;
}
};
Thanks to angular documentation In order to do a custom validation, you need to create a directive, not a controller.
When the validator return a false response, angular will put an ng-invalid class to you DOM Object. It will allow you to change the border color or the style of your invalid input
there were easier way, ng-class - check if validateDob returning false, if yes, show validation frame.
I am using a date picker that has a set range 1999:2005 however I only want from 08-01-1999 to be valid to 07-31-2005 so if the user selects outside of these dates I don't want my form to submit but instead prompt the user to add correct dates, I'm using parsley.js and was wondering if it is possible to add a date range in there to take care of this? If not I can add in my own validation.
You can fake it by using the parsley-beforedate="#elem" and parsley-afterdate="#elem" to refer to hidden, non-submitted fields which have these boundary values in them.
Alternatively, write a custom validator in JavaScript which you apply to these date fields along with the standard date validation. Here's one I wrote to prevent dates in the future. You can adapt it for your date range validation (note: it uses the datepicker routine from jqueryui).
$( '#formUpdate' ).parsley( {
validateIfUnchanged: true,
validators: {
// checks that a date is not in the future
// try needed because datepicker can throw an exception
notfuturedate: function ( fieldValue ) {
try {
var d1 = $.datepicker.parseDate("dd/mm/yy", fieldValue); // convert string to date
} catch (e) {
// if date is invalid, let the date check routine report it
return true;
}
var d0 = new Date(); // today
return (d1<=d0);
}
}
// some other irrelevant lines omitted
});
Having declared this new validator, you just put parsley-notfuturedate="true" on the input field and it works like a built-in parsley validation.
Also, if you are using a datepicker like the jqueryUI one , there are options (minDate, maxDate) to limit the range available.
<input type="text" placeholder="MM/DD/YYYY" required="" data-parsley-required-message="Date is required." data-parsley-pattern="^[0-9]{2}/[0-9]{2}/[0-9]{4}$" data-parsley-pattern-message="Invalid Date." data-parsley-maxdate="12/31/2019" data-parsley-mindate="01/01/2018" data-date-format="MM/DD/YYYY">
<script type="text/javascript">
window.ParsleyValidator
.addValidator('mindate', function(value, requirement) {
// is valid date?
var timestamp = Date.parse(value),
minTs = Date.parse(requirement);
return isNaN(timestamp) ? false : timestamp >= minTs;
}, 32)
.addMessage('en', 'mindate', '<div class="date-error">Date should be greater than or equal to %s</div>');
window.ParsleyValidator
.addValidator('maxdate', function(value, requirement) {
// is valid date?
var timestamp = Date.parse(value),
minTs = Date.parse(requirement);
return isNaN(timestamp) ? false : timestamp <= minTs;
}, 32)
.addMessage('en', 'maxdate', '<div class="date-error">Date should be less than or equal to %s </div>');
</script>
So I have a textbox which allows a max entry of 5 characters.
The user should enter the time in the format hh:mm or hhmm , into the textbox.
Supposing the user enters 1:2:3 or 1::2 etc, then it should show an alert message('Incorrect time format')
Is there any way I can check all other occurences of : EXCEPT for the first : , and alert the user?
(This needs to be done within a javascript function)
This is what I used to check for non-digit values(excluding :) entered into textbox:
<script type='text/javascript'>
function getClks(){
...
var re=":";
var found = clks.match(re);
if (clks.match(/^[0-9:]/)){
alert('Invalid time value');
}
if (found=:){
var splitime = clks.split(":");
var hours = splitime[0];
var mins = splitime[1];
......
}
}
</script>
Unless you have a very good reason to change the user's input. I would recommend only alerting the user that their input doesn't match the correct format.
If you really want to remove characters, you can use the replace function with some regex to remove the extra : chars.
You can use search or match to test whether the input is in the correct format.
Something like /^\d{1,2}:\d{2}$/ should work.
try to use this jquery plugin: http://digitalbush.com/projects/masked-input-plugin/
It will mask your textbox:
$("#hour").mask("99:99");
#alexl's jQuery plugin is probably enough, but for completeness sake..
Outside jQuery contexts I'd use a RegExp, /([0-9][0-9]):([0-9][0-9])/, and test the number string like so:
var timestr = /* .. get the text .. */
if(timestr.match(/([0-9][0-9]):([0-9][0-9])/) {
console.log('Good number string');
} else {
console.log('Bad number string');
}
Everyone else explained what to do. Here's a more concrete example of how to use it.
var regex = new RegExp("\\d{2}[:]\\d{2}");
if (regex.test(input)) {
var array = input.split(":");
var hours = array[0];
var minutes = array[1];
} else {
alert("malformed input");
}
You could do something like this
markup
<input id="myinput" maxlength="5" type="text" />
<input type="button" onclick="test()" value="test" id="testbtn" />
js
var re = new RegExp("^([0-1][0-9]|[2][0-3])(:([0-5][0-9])){1,2}$");
var myInput = document.getElementById('myinput');
function test(){
alert(re.test(myInput.value)); //alerts true if the input is well-formed
}
example => http://jsfiddle.net/steweb/rRZLx/