It seems the minlength attribute for an <input> field doesn't work.
Is there any other attribute in HTML with the help of which I can set the minimal length of a value for fields?
You can use the pattern attribute. The required attribute is also needed, otherwise an input field with an empty value will be excluded from constraint validation.
<input pattern=".{3,}" required title="3 characters minimum">
<input pattern=".{5,10}" required title="5 to 10 characters">
If you want to create the option to use the pattern for "empty, or minimum length", you could do the following:
<input pattern=".{0}|.{5,10}" required title="Either 0 OR (5 to 10 chars)">
<input pattern=".{0}|.{8,}" required title="Either 0 OR (8 chars minimum)">
There is a minlength property in the HTML5 specification now, as well as the validity.tooShort interface.
Both are now enabled in recent versions of all modern browsers. For details, see https://caniuse.com/#search=minlength.
Here is HTML5-only solution (if you want minlength 5, maxlength 10 character validation)
http://jsfiddle.net/xhqsB/102/
<form>
<input pattern=".{5,10}">
<input type="submit" value="Check"></input>
</form>
Yes, there it is. It's like maxlength. W3.org documentation:
http://www.w3.org/TR/html5/forms.html#attr-fe-minlength
In case minlength doesn't work, use the pattern attribute as mentioned by #Pumbaa80 for the input tag.
For textarea:
For setting max; use maxlength and for min go to this link.
You will find here both for max and min.
I used maxlength and minlength with or without required and it worked for me very well for HTML5.
<input id="passcode" type="password" minlength="8" maxlength="10">
`
minlength attribute is now widely supported in most of the browsers.
<input type="text" minlength="2" required>
But, as with other HTML5 features, IE11 is missing from this panorama. So, if you have a wide IE11 user base, consider using the pattern HTML5 attribute that is supported almost across the board in most browsers (including IE11).
To have a nice and uniform implementation and maybe extensible or dynamic (based on the framework that generate your HTML), I would vote for the pattern attribute:
<input type="text" pattern=".{2,}" required>
There is still a small usability catch when using pattern. The user will see a non-intuitive (very generic) error/warning message when using pattern. See this jsfiddle or below:
<h3>In each form type 1 character and press submit</h3>
</h2>
<form action="#">
Input with minlength: <input type="text" minlength="2" required name="i1">
<input type="submit" value="Submit">
</form>
<br>
<form action="#">
Input with patern: <input type="text" pattern=".{2,}" required name="i1">
<input type="submit" value="Submit">
</form>
For example, in Chrome (but similar in most browsers), you will get the following error messages:
Please lengthen this text to 2 characters or more (you are currently using 1 character)
by using minlength and
Please match the format requested
by using pattern.
I notice that sometimes in Chrome when autofill is on and the fields are field by the autofill browser build in method, it bypasses the minlength validation rules, so in this case you will have to disable autofill by the following attribute:
autocomplete="off"
<input autocomplete="new-password" name="password" id="password" type="password" placeholder="Password" maxlength="12" minlength="6" required />
The minLength attribute (unlike maxLength) does not exist natively in HTML5. However, there a some ways to validate a field if it contains less than x characters.
An example is given using jQuery at this link: http://docs.jquery.com/Plugins/Validation/Methods/minlength
<html>
<head>
<script src="http://code.jquery.com/jquery-latest.js"></script>
<script type="text/javascript" src="http://jzaefferer.github.com/jquery-validation/jquery.validate.js"></script>
<script type="text/javascript">
jQuery.validator.setDefaults({
debug: true,
success: "valid"
});;
</script>
<script>
$(document).ready(function(){
$("#myform").validate({
rules: {
field: {
required: true,
minlength: 3
}
}
});
});
</script>
</head>
<body>
<form id="myform">
<label for="field">Required, Minimum length 3: </label>
<input class="left" id="field" name="field" />
<br/>
<input type="submit" value="Validate!" />
</form>
</body>
</html>
Not HTML5, but practical anyway: if you happen to use AngularJS, you can use ng-minlength (or data-ng-minlength) for both inputs and textareas. See also this Plunk.
My solution for textarea using jQuery and combining HTML5 required validation to check the minimum length.
minlength.js
$(document).ready(function(){
$('form textarea[minlength]').on('keyup', function(){
e_len = $(this).val().trim().length
e_min_len = Number($(this).attr('minlength'))
message = e_min_len <= e_len ? '' : e_min_len + ' characters minimum'
this.setCustomValidity(message)
})
})
HTML
<form action="">
<textarea name="test_min_length" id="" cols="30" rows="10" minlength="10"></textarea>
</form>
See http://caniuse.com/#search=minlength. Some browsers may not support this attribute.
If the value of the "type" is one of them:
text, email, search, password, tel, or URL (warning: not include number | no browser support "tel" now - 2017.10)
Use the minlength(/ maxlength) attribute. It specifies the minimum number of characters.
For example,
<input type="text" minlength="11" maxlength="11" pattern="[0-9]*" placeholder="input your phone number">
Or use the "pattern" attribute:
<input type="text" pattern="[0-9]{11}" placeholder="input your phone number">
If the "type" is number, although minlength(/ maxlength) is not be supported, you can use the min(/ max) attribute instead of it.
For example,
<input type="number" min="100" max="999" placeholder="input a three-digit number">
New version:
It extends the use (textarea and input) and fixes bugs.
// Author: Carlos Machado
// Version: 0.2
// Year: 2015
window.onload = function() {
function testFunction(evt) {
var items = this.elements;
for (var j = 0; j < items.length; j++) {
if ((items[j].tagName == "INPUT" || items[j].tagName == "TEXTAREA") && items[j].hasAttribute("minlength")) {
if (items[j].value.length < items[j].getAttribute("minlength") && items[j].value != "") {
items[j].setCustomValidity("The minimum number of characters is " + items[j].getAttribute("minlength") + ".");
items[j].focus();
evt.defaultPrevented;
return;
}
else {
items[j].setCustomValidity('');
}
}
}
}
var isOpera = !!window.opera || navigator.userAgent.indexOf(' OPR/') >= 0;
var isChrome = !!window.chrome && !isOpera;
if(!isChrome) {
var forms = document.getElementsByTagName("form");
for(var i = 0; i < forms.length; i++) {
forms[i].addEventListener('submit', testFunction,true);
forms[i].addEventListener('change', testFunction,true);
}
}
}
I wrote this JavaScript code, [minlength.js]:
window.onload = function() {
function testaFunction(evt) {
var elementos = this.elements;
for (var j = 0; j < elementos.length; j++) {
if (elementos[j].tagName == "TEXTAREA" && elementos[j].hasAttribute("minlength")) {
if (elementos[j].value.length < elementos[j].getAttribute("minlength")) {
alert("The textarea control must be at least " + elementos[j].getAttribute("minlength") + " characters.");
evt.preventDefault();
};
}
}
}
var forms = document.getElementsByTagName("form");
for(var i = 0; i < forms.length; i++) {
forms[i].addEventListener('submit', testaFunction, true);
}
}
In my case, in which I validate the most manually and using Firefox (43.0.4), minlength and validity.tooShort are not available unfortunately.
Since I only need to have minimum lengths stored to proceed, an easy and handy way is to assign this value to another valid attribute of the input tag. In that case then, you can use min, max, and step properties from [type="number"] inputs.
Rather than storing those limits in an array it's easier to find it stored in the same input instead of getting the element id to match the array index.
I used max and min then required, and it worked for me very well, but what am not sure is if it is a but coding method.
<input type="text" maxlength="13" name ="idnumber" class="form-control" minlength="13" required>
If desired to make this behavior, always show a small prefix on the input field or the user can't erase a prefix:
// prefix="prefix_text"
// If the user changes the prefix, restore the input with the prefix:
if(document.getElementById('myInput').value.substring(0,prefix.length).localeCompare(prefix))
document.getElementById('myInput').value = prefix;
Following #user123444555621 pinned answer.
There is a minlength attribute in HTML5 but for some reason it may not always work as expected.
I had a case where my input type text did not obey the minlength="3" property.
By using the pattern attribute I managed to fix my problem.
Here's an example of using pattern to ensure minlength validation:
const folderNameInput = document.getElementById("folderName");
folderNameInput.addEventListener('focus', setFolderNameValidityMessage);
folderNameInput.addEventListener('input', setFolderNameValidityMessage);
function setFolderNameValidityMessage() {
if (folderNameInput.validity.patternMismatch || folderNameInput.validity.valueMissing) {
folderNameInput.setCustomValidity('The folder name must contain between 3 and 50 chars');
} else {
folderNameInput.setCustomValidity('');
}
}
:root {
--color-main-red: rgb(230, 0, 0);
--color-main-green: rgb(95, 255, 143);
}
form input {
border: 1px solid black;
outline: none;
}
form input:invalid:focus {
border-bottom-color: var(--color-main-red);
box-shadow: 0 2px 0 0 var(--color-main-red);
}
form input:not(:invalid):focus {
border-bottom-color: var(--color-main-green);
box-shadow: 0 2px 0 0 var(--color-main-green);
}
<form>
<input
type="text"
id="folderName"
placeholder="Your folder name"
spellcheck="false"
autocomplete="off"
required
minlength="3"
maxlength="50"
pattern=".{3,50}"
/>
<button type="submit" value="Create folder">Create folder</button>
</form>
For further details, here's the MDN link to the HTML pattern attribute: https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/pattern
You can use minlength in input tag or you can regex pattern to check the number of character or even you can take the input and check the length of the character and then you can restrict based upon your requirement.
Smartest Way for maxlength
$("html").on("keydown keyup change", "input", function(){
var maxlength=$(this).attr('maxlength');
if(maxlength){
var value=$(this).val();
if(value.length<=maxlength){
$(this).attr('v',value);
}
else{
$(this).val($(this).attr('v'));
}
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<input type="text" maxlength="10">
I've used the follow tag with numbers:
<input type="tel" class="form-control" name="Extension" id="Extension" required maxlength="4" minlength="4" placeholder="4 Digits" />
Add both a maximum and a minimum value. You can specify the range of allowed values:
<input type="number" min="1" max="999" />
I am using html and jQuery library, trying to avoid core JavaScript, just bc I do not want to mix it
I have 3 fields, when user click on field1, then click some where else, I want field1 border to turn red only.
If user click on field2 then clicks some where else, I want field2 border to turn red only.
Right now blur() works perfectly but it creates a red border on every fields. this is because I am using .input class. any idea how can I do this without getting id? bc I will have 40 fields when i am done
html code:
<asp:TextBox runat="server" id="test1" class="input green" /> <br />
<asp:TextBox runat="server" id="test2" class="input blue" />
jquery code:
$(function() {
$(".input").blur(function() {
if ($(".input").val().trim() == '')
$(".input").css('border-color', 'red');
else
$(".input").css('border-color', '');
});
});
Use $(this) instead of repeating class name.
$(function() {
$(".input").blur(function() {
if ($(this).val().trim() == '')
$(this).css('border-color', 'red');
else
$(this).css('border-color', '');
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="text" class="input"/>
<input type="text" class="input"/>
<input type="text" class="input"/>
Optional
Also instead of
$(this).val().trim() == '' you can use $(this).val().length <= 0
I want to stop taking input in the text field once 10 characters have been entered.
What I have so far is not working:
$(document).ready(function() {
$('#comment').keypress(function(event){
if ($('#comment').val()).length == 10) {
event.preventDefault();
}
});
});
What am I missing?
You don't need jQuery for this. Use the maxlength attribute instead. It can be used with input or textarea elements:
<input id="comment" maxlength="2" type="text">
<textarea maxlength="100"></textarea>
You can use the maxlength attribute of the input tag
http://www.w3schools.com/tags/att_input_maxlength.asp
I'm working on a legacy .NET WebForms project where the front-end is being updated with Bootstrap.
There are some .NET Validation Controls which are validating on the ClientSide, but the "has-error" class needs to be added to the parent div of the input fields to match the Bootstrap markup.
Is there an event hook or a way of extending the .NET Validators so that I can add the "has-error" class to an invalid control group and remove it when valid?
e.g: Here is my markup which works server side:
<div class="form-group <%= IIf(RequiredFieldValidator1.IsValid, "has-error", "") %>">
<label class="control-label">Test</label>
<asp:TextBox runat="server" ID="TextBox1" CssClass="form-control" />
<asp:RequiredFieldValidator runat="server" ID="RequiredFieldValidator1"
ContolToValidate="TextBox1" ErrorMessage="TextBox1 is Required!" />
</div>
I was requiring the has-feedback class on the form-group div as well as the glyphicon tick and crosses depending on whether the input was valid or not. What I have found that works in my solution is to override asp.net's client side function ValidatorUpdateDisplay (note my code utilizes jQuery although you could use native JavaScript):
var originalValidatorUpdateDisplayMethod;
if (typeof(ValidatorUpdateDisplay) == "function"
&& typeof(originalValidatorUpdateDisplayMethod) != "function") {
originalValidatorUpdateDisplayMethod = ValidatorUpdateDisplay;
// now overwrite original method
ValidatorUpdateDisplay = function (val) {
originalValidatorUpdateDisplayMethod(val); // call original method first
var parent = $("#" + val.controltovalidate).parent();
if (parent.hasClass("form-group")) {
parent.addClass("has-feedback");
parent.toggleClass("has-success", val.isvalid);
parent.toggleClass("has-error", !val.isvalid);
var glyph = parent.find("span.form-control-feedback");
if (glyph.length == 0) {
glyph = $("<span class='glyphicon form-control-feedback' />");
parent.append(glyph);
}
glyph.toggleClass("glyphicon-ok", val.isvalid);
glyph.toggleClass("glyphicon-remove", !val.isvalid);
}
}
}
This adds the bootstrap validation to fields when they change as well as when an event on a control that has causesvalidation="true" is triggered.
Note: this is only adding the validations on the client side.
You'll need to put a id on the element
<div id="div1" class="someclass">
<img ... id="image1" name="image1" />
</div>
and this is the javascript which adds a class to a <div> element
var d = document.getElementById("div1");
d.className = d.className + " otherclass";
Here is what I did:
<asp:Panel ID="pnlNumberOnly" runat="server" CssClass="form-group">
<label for="<%= tbNumberOnly.ClientID %>" class="control-label">Enter a number:</label>
<asp:TextBox ID="tbNumberOnly" runat="server" CssClass="form-control" />
<asp:RegularExpressionValidator runat="server" ID="regExpNumberOnly"
ControlToValidate="tbNumberOnly"
Display="Dynamic"
ErrorMessage="Numbers only" CssClass="control-label"
ValidationExpression="^\d+$" EnableClientScript="True"/>
</asp:Panel>
and then my js looked like this:
$(document).ready(function() {
$('#<%= tbNumberOnly.ClientID %>').change(function() {
if ($('#<%= regExpNumberOnly.ClientID %>').is(':visible')) {
$('#<%= pnlNumberOnly.ClientID %>').addClass('has-error');
} else {
$('#<%= pnlNumberOnly.ClientID %>').removeClass('has-error');
}
});
});