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<!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>用JS添加文本框案例代码</title> </head> <body> <form id="t"> <table id="table"> <tr></td><input type="text" value="1" /></td></tr> <table> <input type="button" id="btn" value="提交" /> <input type="button" id="new" value="新增" /> </form> <script> document.getElementById(‘new‘).onclick = function(){ var input = document.createElement(‘input‘); var tr = document.createElement(‘tr‘); var td = document.createElement(‘td‘); td.appendChild(input); tr.appendChild(td); document.getElementById(‘table‘).appendChild(tr); }; document.getElementById(‘btn‘).onclick = function(){ var inps = document.getElementsByTagName(‘input‘), len = inps.length,count = 0,arr = []; for(var i = 0; i < len; i++){ if(inps[i].type == ‘text‘){ arr.push(inps[i]); } } for(var i = 0; i < arr.length; i++){ if(inps[i].value != ‘‘){ count++; }else{ count--; } } if(count == arr.length){ alert(‘提交‘) document.getElementById(‘t‘).submit(); }else{ alert(‘有空值‘) } }; </script> </body> </html>
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原文地址：http://www.cnblogs.com/qingsong/p/5389487.html
