javascript - Jquery limit text in input box

Question

I want to limit number of chars in input text field.

Code I'm using:

function limitText(field, maxChar){
    if ($(field).val().length > maxChar){
       $(field).val($(field).val().substr(0, maxChar));
    }
}

Event is onkeyup. When I type some text in input field cursor stays on the end of text but focus is backed on start of the text so I can't see cursor.

What can be a problem.

Browser is FF, on IE and chrome it is working correctly

Answer 1

you can also do it like this:

<input type="text" name="usrname" maxlength="10" />

to achieve this with jQuery, you can do this:

function limitText(field, maxChar){
    $(field).attr('maxlength',maxChar);
}

Answer 2

您的代码在 FF 中运行。这是您的代码的略微修改版本：

$('input.testinput').on('keyup', function() {
    limitText(this, 10)
});

function limitText(field, maxChar){
    var ref = $(field),
        val = ref.val();
    if ( val.length >= maxChar ){
        ref.val(function() {
            console.log(val.substr(0, maxChar))
            return val.substr(0, maxChar);       
        });
    }
}

演示