本文實例講述了js實現表單檢測及表單提示的方法。分享給大家供大家參考。具體如下：
這是個實用的表單判斷以及表單提示效果，如果點擊需要輸入文字的時候，提示就會跑出來，提示框的形狀比較個性化，有一個三角符號指向輸入框，有兩張圖片需要下載。
運行效果如下圖所示：
在線演示地址如下：
http://demo.VeVB.COm/js/2015/js-table-check-form-tips-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><title>表單檢測及表單提示</title><style type="text/css">dl {font:normal 12px/15px Arial;position: relative;width: 350px;}dt { clear: both; float:left; width: 130px; padding: 4px 0 2px 0; text-align: left;}dd { float: left; width: 200px; margin: 0 0 8px 0; padding-left: 6px;}.hint { display: none; position: absolute; right: -250px; width: 200px; margin-top: -4px; border: 1px solid #c93; padding: 10px 12px; background: #ffc url("images/pointer.gif") no-repeat -10px 5px;}.hint .hint-pointer { position: absolute; left: -10px; top: 5px; width: 10px; height: 19px; background: url("images/pointer.gif") left top no-repeat;}</style><script type="text/javascript">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++){ if (inputs[i].parentNode.getElementsByTagName("span")[0]) { inputs[i].onfocus = function () { this.parentNode.getElementsByTagName("span")[0].style.display = "inline"; } inputs[i].onblur = function () { this.parentNode.getElementsByTagName("span")[0].style.display = "none"; } } } var selects = document.getElementsByTagName("select"); for (var k=0; k<selects.length; k++){ if (selects[k].parentNode.getElementsByTagName("span")[0]) { selects[k].onfocus = function () { this.parentNode.getElementsByTagName("span")[0].style.display = "inline"; } selects[k].onblur = function () { this.parentNode.getElementsByTagName("span")[0].style.display = "none"; } } }}addLoadEvent(prepareInputsForHints);</script></head><body><p style="font:normal 12px/15px Arial;">Tab or click through the fields to reveal the hints.</p><dl> <dt> <label for="firstname">First Name:</label> </dt> <dd> <input name="firstname" id="firstname" type="text" /> <span class="hint">This is the name your mama called you when you were little.<span class="hint-pointer"> </span></span> </dd> <dt> <label for="lastname">Last Name:</label> </dt> <dd> <input name="lastname" id="lastname" type="text" /> <span class="hint">This is the name your sergeant called you when you went through bootcamp.<span class="hint-pointer"> </span></span> </dd> <dt> <label for="email">Email:</label> </dt> <dd> <input name="email" id="email" type="text" /> <span class="hint">The thing with the @ symbol and the dot com at the end.<span class="hint-pointer"> </span></span> </dd> <dt><label for="year">Birth Year:</label></dt> <dd> <select id="year" name="year"> <option value="">YYYY</option> <option value="1066">1066</option> <option value="1492">1492</option> <option value="1776">1776</option> </select> <span class="hint">Pick a famous year to be born in.<span class="hint-pointer"> </span></span> </dd> <dt> <label for="username">Username:</label> </dt> <dd> <input name="username" id="username" type="text" /> <span class="hint">Between 4-12 characters.<span class="hint-pointer"> </span></span> </dd> <dt> <label for="password">Password:</label> </dt> <dd> <input name="password" id="password" type="password" /> <span class="hint">Between 5-13 characters, but not 7. Never 7.<span class="hint-pointer"> </span></span> </dd> <dt class="button"> </dt> <dd class="button"> <input type="submit" class="button" value="Submit" /> </dd></dl></body></html>希望本文所述對大家的javascript程序設計有所幫助。
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