Is there a minlength validation attribute in HTML5?

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It seems the minlength attribute for an field doesn\'t work.

Is there any other attribute in HTML5 with the help of which I

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抹茶落季

2020-11-22 17:26
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.
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感动是毒

2020-11-22 17:28

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>

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梦谈多话

2020-11-22 17:33

Not HTML5, but practical anyway: if you happen to use AngularJS, you can use ng-minlength for both inputs and textareas. See also this Plunk.

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孤街浪徒

2020-11-22 17:34

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>

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慢半拍i

2020-11-22 17:36

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);
        }
    }
}

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