本文實(shí)例講述了Ajax帶提示的驗(yàn)證表單。。具體如下：
這是一個(gè)常用的Ajax表單驗(yàn)證程序，實(shí)時(shí)提示你輸入的字符是否符合要求，簡(jiǎn)潔明快，便于修改，這是用JavaScript實(shí)現(xiàn)的，沒(méi)有摻雜其它的框架類代碼，因此比較實(shí)用。
運(yùn)行效果截圖如下：
在線演示地址如下：
http://demo.Vevb.com/js/2015/js-ajax-table-check-codes/
具體代碼如下：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="content-type" content="text/html; charset=utf-8" /><title>帶提示的Ajax驗(yàn)證表單</title><style type="text/css">form { width:500px; border:1px solid #ccc;}fieldset { border:0; padding:10px; margin:10px; position:relative;}label { display:block; font:normal 12px/17px verdana;}input {width:160px;}span.hint { font:normal 11px/14px verdana; background:#eee url(images/bg-span-hint-gray.gif) no-repeat top left; color:#444; border:1px solid #888; padding:5px 5px 5px 40px; width:250px; position:absolute; margin: -12px 0 0 14px; display:none;}fieldset.welldone span.hint { background:#9fd680 url(images/bg-span-hint-welldone.jpg) no-repeat top left; border-color:#749e5c; color:#000;}fieldset.kindagood span.hint { background:#ffffcc url(images/bg-span-hint-kindagood.jpg) no-repeat top left; border-color:#cc9933;}fieldset.welldone { background:transparent url(images/bg-fieldset-welldone.gif) no-repeat 194px 19px;}fieldset.kindagood { background:transparent url(images/bg-fieldset-kindagood.gif) no-repeat 194px 19px;}</style><script type="text/javascript">function checkUsernameForLength(whatYouTyped) { var fieldset = whatYouTyped.parentNode; var txt = whatYouTyped.value; if (txt.length > 5) { fieldset.className = "welldone"; } else { fieldset.className = ""; }}function checkPassword(whatYouTyped) { var fieldset = whatYouTyped.parentNode; var txt = whatYouTyped.value; if (txt.length > 3 && txt.length < 8) { fieldset.className = "kindagood"; } else if (txt.length > 7) { fieldset.className = "welldone"; } else { fieldset.className = ""; }}function checkEmail(whatYouTyped) { var fieldset = whatYouTyped.parentNode; var txt = whatYouTyped.value; if (/^/w+([/.-]?/w+)*@/w+([/.-]?/w+)*(/./w{2,3})+$/.test(txt)) { fieldset.className = "welldone"; } else { fieldset.className = ""; }}function addLoadEvent(func) { var oldonload = window.onload; if (typeof window.onload != 'function') { window.onload = func; } else { window.onload = function() { oldonload(); func(); } }}function prepareInputsForHints() { var inputs = document.getElementsByTagName("input"); for (var i=0; i<inputs.length; i++){ inputs[i].onfocus = function () { this.parentNode.getElementsByTagName("span")[0].style.display = "inline"; } inputs[i].onblur = function () { this.parentNode.getElementsByTagName("span")[0].style.display = "none"; } }}addLoadEvent(prepareInputsForHints);</script></head><body><form action="#" name="basicform" id="basicform" ><fieldset> <label for="username">用戶名:</label> <input type="text" id="username" onkeyup="checkUsernameForLength(this);" /> <span class="hint">用戶名最低6位哦</span></fieldset><fieldset> <label for="password">密碼:</label> <input type="password" id="password" onkeyup="checkPassword(this);" /> <span class="hint">密碼需要4到8位哦</span></fieldset><fieldset> <label for="email">Email地址:</label> <input type="text" id="email" onkeyup="checkEmail(this);" /> <span class="hint">You can enter your real address without worry - we don't spam!</span></fieldset></form></body></html>
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