计算字符串长度，包括“隐形字符"，例如javascript和php中的\ r \ n [英] count string length including 'invisible characters' like \r \n in javascript and php

问题描述

我正在尝试在textarea旁边显示剩余x个字符"文本，以查看可以用javascript/jquery编写多少内容:

I am trying to display a "x characters left" text next to a textarea, to see how much still can be written, with javascript / jquery:

var area = 'textarea#zoomcomment';
var c = $(area).val().length;

然后使用laravel的max验证对输入进行验证.

Then the input is validated with laravel's max validation.

'comment' => 'required|max:3000'

javascript不计算\n或\r字符，但是PHP/laravel计数.是否有JavaScript函数可以计算所有内容，包括换行符等?我想让js和php具有相同的字符串长度.

The javascript does not count the \n or \r characters, but PHP/laravel does. Is there a javascript function to count everything , including linebreaks etc ? I'd like to have the same string length with js and php.

看来，javascript/jquery将\n\r计为1，而php strlen()将其计为2字符.我试图避免使用jquery，但它似乎仍然算错了:(

it seems, that javascript/jquery counts \n\r as 1 and php strlen() counts it as 2 characters. I tried to avoid jquery, but it still seemed to count wrong :(

        var c = document.getElementById('zoomcomment').value.length;
        alert(c);

此问题有很好的答案

推荐答案

您可以使用html函数来实现，它会为您提供innerhtml-

You could do it using html function which gives you innerhtml -

var area = 'textarea#zoomcomment';
var c = $(area).html().length;

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