如何使用maxlength阻止textarea中的进一步输入 [英] How can I block further input in textarea using maxlength
问题描述
我有一个textarea,如果输入的字符达到最大长度,我想阻止输入。
I have a textarea that I want to block input on if the entered characters reaches a max-length.
我目前有一个文本框的Jquery脚本,用于计算输入的字符,并且想要添加一些内容,一旦输入150个字符,将阻止在textarea中输入。
I currently have a Jquery script for the textbox that calculates the characters entered and want to add something that will block input in the textarea once 150 characters are entered.
我尝试将max-length插件与我的脚本结合使用,但它们似乎不起作用。感谢帮助。
I have tried using max-length plugins in conjunction with my script but they don't seem to work. Help is appreciated.
当前代码
(function($) {
$.fn.charCount = function(options){
// default configuration properties
var defaults = {
allowed: 150,
warning: 25,
css: 'counter',
counterElement: 'span',
cssWarning: 'warning',
cssExceeded: 'exceeded',
counterText: '',
container: undefined // New option, accepts a selector string
};
var options = $.extend(defaults, options);
function calculate(obj,$cont) {
// $cont is the container, now passed in instead.
var count = $(obj).val().length;
var available = options.allowed - count;
if(available <= options.warning && available >= 0){
$cont.addClass(options.cssWarning);
} else {
$cont.removeClass(options.cssWarning);
}
if(available < 0){
$cont.addClass(options.cssExceeded);
} else {
$cont.removeClass(options.cssExceeded);
}
$cont.html(options.counterText + available);
};
this.each(function() {
// $container is the passed selector, or create the default container
var $container = (options.container)
? $(options.container)
.text(options.counterText)
.addClass(options.css)
: $('<'+ options.counterElement +' class="' + options.css + '">'+ options.counterText +'</'+ options.counterElement +'>').insertAfter(this);
calculate(this,$container);
$(this).keyup(function(){calculate(this,$container)});
$(this).change(function(){calculate(this,$container)});
});
};
})(jQuery);
推荐答案
你最好不要试图阻止用户输入太多字符而不是显示计数器,并且仅在用户尝试提交时强制执行字符限制。评论框Stack Overflow就是一个不错的例子。这在技术上更容易,更重要的是用户更好地这样做:即使您知道字符限制,也不能将文本输入/粘贴/拖动到文本区域,这真的很烦人。
You're much better off not trying to prevent the user from typing in too many characters and instead showing a counter and only enforcing the character limit when the user tries to submit. The comment boxes Stack Overflow are a decent example. It's both easier technically and more importantly better for the user to do it this way: it's really irritating not to be able to type/paste/drag text into a textarea even if you know there's a character limit.
这篇关于如何使用maxlength阻止textarea中的进一步输入的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!