效果超酷的textarea的输入字数限提…-白红宇的个人博客

效果超酷的textarea的输入字数限提…

发布日期：2021-05-04 09:17:57 浏览次数：18 分类：技术文章

本文共 9821 字，大约阅读时间需要 32 分钟。

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "">

<head>

<title>POPHint & statInput 整合效果</title>

<!--

* {padding: 0; margin: 0}

body {margin: 3em; font: 12px Tahoma; background: #EAEAEA; color: #333333; line-height: 20px}

input, textarea {font: 12px Tahoma; color: #666666; padding: 2px; border: solid 1px #DBDBDB}

textarea {padding: 5px; line-height: 20px}

p {margin: 1em 0}

ul {}

li {height: 1%; overflow: hidden; list-style-type: none}

a {color: #666666; text-decoration: none}

a:hover {color: #333333}

.r {float: right}

.l {float: left}

.b {font-weight: bold}

.gray {color: #666666; margin-top: 8px}

.light {color:#FF6600; margin: 0 5px}

.case {display: block; padding: 0 2em 2em 2em; border: solid 1px #EAEAEA; background: #FFFFFF; margin-bottom: 2em; height: 1%; overflow: hidden}

.title {display:block; padding: .5em 2em .5em 1em; margin: 0 -2em 2em -2em; font-weight: bold; color: #000000; background: #FAFAFA; border-bottom: solid 1px #EAEAEA}

.call {display:block;}

.key {display: block; width: 6em; float: left}

.type {display: block; width: 6em; float: left}

.info {padding-left: 2em}

.demo {margin-bottom: 2em}

#popHint {position: absolute; line-height: normal}

#popHint .popLeft, #popHint .popRight, #popHint .popAngle span, #popHintText, #popHint .popIcon {background-image: url()}

#popHint .popHeader {height: 1%; overflow: hidden !important; overflow : visible}

#popHint .popLeft {float: left; width: 5px; height: 24px; background-position: 0 0; background-repeat: no-repeat}

#popHint .popRight {float: left; width: 5px; height: 24px; background-position: -10px -25px; background-repeat: no-repeat}

#popHint .popAngle {clear: both; position: relative; height: 10px}

#popHint .popAngle span {position: absolute; top: -3px; left: 15px; width: 7px; height: 13px; background-position: 0 -75px; background-repeat: no-repeat}

#popHintText {float: left; color: #975400; height: 19px !important; height : 24px; padding: 5px 0 0 0; white-space: nowrap; background-position: 0 -50px; background-repeat: repeat-x; overflow: hidden}

#popHintText .popIcon {float: left; width: 15px; height: 10px; margin: 1px 3px 0 0}

#popHint .wrong {background-position: 0 -90px; background-repeat: no-repeat}

#popHint .right {background-position: 0 -105px; background-repeat: no-repeat}

-->

</style>

<!--

// 这里都是公用函数，挺多的...

var

// 获取元素

$ = function(element) {

return (typeof(element) == 'object' ? element : document.getElementByIdx(element));

// 判断浏览器

brower = function() {

var ua = navigator.userAgent.toLowerCase();

var os = new Object();

os.isFirefox = ua.indexOf ('gecko') != -1;

os.isOpera = ua.indexOf ('opera') != -1;

os.isIE = !os.isOpera && ua.indexOf ('msie') != -1;

os.isIE7 = os.isIE && ua.indexOf ('7.0') != -1;

return os;

// 生成元素到refNode

appendElement = function(tagName, Attribute, strHtml, refNode) {

var cEle = document.createElement_x(tagName);

// 属性值

for (var i in Attribute){

cEle.setAttribute(i, Attribute[i]);

}

cEle.innerHTML = strHtml;

refNode.appendChild(cEle);

return cEle;

// 获取元素坐标

getCoords = function(node){

var x = node.offsetLeft;

var y = node.offsetTop;

var parent = node.offsetParent;

while (parent != null){

x += parent.offsetLeft;

y += parent.offsetTop;

parent = parent.offsetParent;

}

return {x: x, y: y};

// 事件操作(可保留原有事件)

eventListeners = [],

findEventListener = function(node, event, handler){

var i;

for (i in eventListeners){

if (eventListeners[i].node == node && eventListeners[i].event == event && eventListeners[i].handler == handler){

return i;

}

return null;

myAddEventListener = function(node, event, handler){

if (findEventListener(node, event, handler) != null){

return;

}

if (!node.addEventListener){

node.attachEvent('on' + event, handler);

}else{

node.addEventListener(event, handler, false);

}

eventListeners.push({node: node, event: event, handler: handler});

removeEventListenerIndex = function(index){

var eventListener = eventListeners[index];

delete eventListeners[index];

if (!eventListener.node.removeEventListener){

eventListener.node.detachEvent('on' + eventListener.event,

eventListener.handler);

}else{

eventListener.node.removeEventListener(eventListener.event,

eventListener.handler, false);

}

myRemoveEventListener = function(node, event, handler){

var index = findEventListener(node, event, handler);

if (index == null) return;

removeEventListenerIndex(index);

cleanupEventListeners = function(){

var i;

for (i = eventListeners.length; i > 0; i--){

if (eventListeners[i] != undefined){

removeEventListenerIndex(i);

}

};

-->

</script>

<!--

function statInput(e, _max, _exp) {

e= $(e);

_max= parseInt(_max);

_max= isNaN(_max) ? 0 : _max;

_exp= _exp==undefined ? {} : _exp;

if(e==null || _max==0) {

alert('statInput初始化失败！');

return;

}

var

// 浏览器

_brower= brower();

// 输出对象

_objMax= _exp._max==undefined ?null : $(_exp._max),

_objTotal= _exp._total==undefined ?null : $(_exp._total),

_objLeft= _exp._left==undefined ?null : $(_exp._left),

// 弹出提示

_hint= _exp._hint==undefined ?null : _exp._hint;

// 初始统计

if(_objMax!=null)_objMax.innerHTML= _max;

if(_objTotal!=null)_objTotal.innerHTML= 0;

if(_objLeft!=null)_objLeft.innerHTML= 0;

// 设置监听事件

// 输入这个方法比较好.

// 但是Opera下中文输入跟粘贴不能正确统计...相当BT的东西...

// 如果不考虑Opera的话就用这个吧.否则就老老实实用计时器.

if(_brower.isIE) {

myAddEventListener(e, "propertychange", stat);

}else{

myAddEventListener(e, "input", stat);

}

// 统计函数

var _len, _olen, _lastRN, _sTop;

_olen = _len = 0;

function stat() {

_len = e.value.length;

if(_len==_olen) return;// 防止用计时器监听时做无谓的牺牲...

if(_len>_max) {

_sTop = e.scrollTop;

// 避免IE最后俩字符为'\r\n'.导致崩溃...

_lastRN = (e.value.substr(_max-1, 2) == "\r\n");

e.value = e.value.substr(0, (_lastRN ? _max-1 : _max));

if(_hint==true) popHint(e, "悟空你也太调皮了，为师跟你说过，叫你不要输那么多字~~.");

// 解决FF老是跑回顶部

if(_brower.isFirefox) e.scrollTop = e.scrollHeight;

}

_olen = _len = e.value.length;

// 显示已输入字数

if(_objTotal!=null) _objTotal.innerHTML = _len;

// 显示剩余可输入字数

if(_objLeft!=null) _objLeft.innerHTML = (_max-_len)<0 ? 0 : (_max-_len);

}

stat();

}

function popHint(obj, msg, initValues) {

var

_obj = $(obj),

_objHint = $("popHint"),

_msg = msg,

_init = initValues;

// 初始化失败...

if(_obj==undefined || _msg==undefined || _msg=="") return;

// 设置初始值

_init = _init==undefined ? {_type : "wrong", _event : "click"} : _init;

// obj如果不可见。设置弹出对象为obj父元素

if(_obj.style.display=='none' || _obj.style.visibility=='hidden' || _obj.getAttribute('type')=='hidden') _obj = _obj.parentNode;

var

_type = null,

_event = null,

_place = getCoords(_obj),

_marTop = null,

_objText = $("popHintText"),

// 初始化

init = function() {

var _hint = _obj.getAttribute("hint");

if(_hint=="false") return;

// 有的时候initValues不为空.但是只设置一个值...避免发生错误.再次设置初始值...

_type = _init._type==undefined ? "wrong" : _init._type;

_type = _type.toLowerCase();

_event = _init._event==undefined ? "click" : _init._event;

_event = _event.toLowerCase();

// 好了.输出...

var _Html = "<div id="popHeader">" +

"<div class="popLeft"></div>" +

"<div id="popHintText"></div>" +

"<div class="popRight"></div>" +

"</div>"+

"<div class="popAngle"><span></span></div>"

if(_objHint==null) {

_objHint = appendElement("div", {"id" : "popHint"}, _Html, document.body);

_objHint.style.display = "none";

_objText = $("popHintText");

}

show();

// 显示

show = function() {

_objHint.style.display = "";

_marTop = _objHint.offsetHeight;

_msg = "<span class="popIcon "+ _type +""></span>"+ _msg;

_objText.innerHTML = _msg;

_objHint.style.left = _place.x +"px";

_objHint.style.top = (_place.y-_marTop+8) +"px";

// 关闭触发事件

switch(_event) {

case "blur" :

myAddEventListener(_obj, 'blur', hide);

break;

//default :

case "click" :

myAddEventListener(document, 'mousedown', hide);

break;

//这里可以自己扩展很多事件...

}

// 关闭

hide = function() {

_objHint.style.display = "none";

_objText.innerHTML = "";

// 移除关闭触发事件

myRemoveEventListener(_obj, 'blur', hide);

myRemoveEventListener(document, 'mousedown', hide);

};

init();

}

-->

</script>

<!--

myAddEventListener(window, "load", testStatInput);

function testStatInput(){

statInput('Test_1', 100, {_max : 'stat_max', _total : 'stat_total', _left : 'stat_left', _hint : true});

}

function testPopHint() {

if($('Test2').value==''){

popHint($('Test2'), 'Test2不能为空...', {_event : 'blur'});

$('Test2').focus();

return false;

}

if($('Test3').value==''){

popHint($('Test3'), 'Test3也不能为空...', 'blur');

$('Test3').focus();

return false;

}

if($('Test4').value==''){

popHint($('Test4'), 'Test4虽然看不见,但也不能为空...');

$('Test4').value='填一点进去...';

return false;

}

if($('Test5').value==''){

popHint($('Test5'), 'Test5也一样...');

return false;

}

-->

</script>

</head>

<body>

<div class="title"><a href="#" class="r">Top</a>statInput 调用方法</div>

<div class="b">statInput(Element, MaxLen, {objMax, objTotal, objLeft, Hint});</div>

<li><span class="key">Element：</span><span class="type">Object</span>限制统计对象 (*必须)</li>

<li><span class="key">MaxLen：</span><span class="type">Number</span>最大可输入长度 (*必须)</li>

<li><span class="key">objMax：</span><span class="type">Object</span>显示最大输入长度对象 (*可选)</li>

<li><span class="key">objTotal：</span><span class="type">Object</span>显示输入统计对象 (*可选)</li>

<li><span class="key">objLeft：</span><span class="type">Object</span>显示可输入长度对象 (*可选)</li>

<li><span class="key">Hint：</span><span class="type">Boolean</span>当长度超出上限时，是否提示 (*可选)</li>

</ul>

</div>

<div class="title"><a href="#" class="r">Top</a>statInput 演示</div>

<textarea name="Test_1" id="Test_1" rows="10" style="width: 99%" >悟空你也太调皮了，我跟你说过，叫你不要乱扔东西，乱扔东西这么做…… （咣当，悟空棍子掉在地上）你看我还没有说完呢你把棍子又给扔掉了！月光宝盒是宝物，你把他扔掉会污染环境，唉，要是砸到小朋友那怎么办？就算没有砸到小朋友砸到那些花花草草也是不对的呀！

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