Enforcing the maxlength attribute on mobile browsers

问题

I have an a text input with a maximum length:

<input type="text" name="name" maxlength="50">

This has been working fine on all the desktop browsers I've tried, but the maximum length does not seem to be enforced on mobile browsers.

Is there any way to get mobile browsers to enforce maxlength? I am open to using JavaScript and/or jQuery in the solution.

回答1:

Try this one:

var $input = $('input')
$input.keyup(function(e) {
    var max = 5;
    if ($input.val().length > max) {
        $input.val($input.val().substr(0, max));
    }
});

jsFiddle here: http://jsfiddle.net/fttk2/1/

回答2:

var max = 1

input.addEventListener('keyup', function (event) {
    event.target.value = event.target.value.substring(0, max)
})

回答3:

Universal jQuery way to enforce the stated maxlength of a form field. (I needed it for sessionStorage, localStorage, and param overrides.) Code optimized for readability.

$('input').on('change', function () {
  var max = $(this).attr('maxlength'),
      val = $(this).val(),
      trimmed;

  if (max && val) {
    trimmed = val.substr(0, max);
    $(this).val(trimmed);
  }
});

回答4:

var maxLength = 10;
var field = $('#myinput');
field.keydown( function(e)
{
    if ( $(this).val().length >= maxLength ) e.preventDefault();
});

回答5:

I'd suggest something a bit more simple. The aboves didn't work for me unless there was a space added for the field to pick up on it... or if I hit submit right after, it still passed the information.

if($(".input") > 20){$(".input") = input.slice(0,20)};

来源：https://stackoverflow.com/questions/17439487/enforcing-the-maxlength-attribute-on-mobile-browsers

标签

javascript

jquery

html

input

maxlength