Rumah >hujung hadapan web >tutorial js >Bagaimana untuk melaksanakan pengesanan borang dan gesaan borang dalam kemahiran js_javascript
Contoh dalam artikel ini menerangkan cara melaksanakan pengesanan borang dan gesaan borang dalam js. Kongsikan dengan semua orang untuk rujukan anda. Butirannya adalah seperti berikut:
Ini adalah penilaian bentuk praktikal dan kesan segera bentuk Jika anda mengklik untuk memasukkan teks, gesaan akan keluar dua gambar yang perlu dimuat turun.
Kesan operasi adalah seperti yang ditunjukkan di bawah:
Alamat demo dalam talian adalah seperti berikut:
http://demo.jb51.net/js/2015/js-table-check-form-tips-codes/
Kod khusus adalah seperti berikut:
<!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>表单检测及表单提示</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>
Saya harap artikel ini akan membantu reka bentuk pengaturcaraan JavaScript semua orang.