<!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> new document </title> <meta name="generator" content="editplus" /> <meta name="author" content="yixianggao@126.com" /> <meta name="keywords" content="javascript" /> <meta name="description" content="for javascript region of csdn" /> </head> <body><input type="text" name="a1" id="b1"><input type="text" name="a2" id="b2"><input type="text" name="a3" id="b3"><input type="text" name="a4" id="b4"><input type="button" id="btnShow" value="Show" onclick="showTextBoxes();" /> <script type="text/javascript">... <!--function showTextBoxes()...{ var colInput = document.getElementsByTagName("input"); for (var i=0; i<colInput.length; i++) ...{ if (colInput[i].type=="text") ...{ if (colInput[i].value=="") ...{ alert(colInput[i].id + " is empty.") } else ...{ alert(colInput[i].id + " is not empty. The value is " + colInput[i].value) } } }} //--> </script> </body></html>////////////////////////////////////////<!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> new document </title> <meta name="generator" content="editplus" /> <meta name="author" content="yixianggao@126.com" /> <meta name="keywords" content="javascript" /> <meta name="description" content="for javascript region of csdn" /> </head> <body><input type="text" name="a1" id="b1"><input type="text" name="a2" id="b2"><input type="text" name="a3" id="b3"><input type="text" name="a4" id="b4"><input type="button" id="btnShow" value="Show" onclick="showTextBoxes();" /> <script type="text/javascript">... <!--function showTextBoxes()...{ var colInput = document.getElementsByTagName("input"); var textCollection = new Array(); for (var i=0; i<colInput.length; i++) ...{ if (colInput[i].type=="text") ...{ if (colInput[i].value=="") ...{ alert(colInput[i].id + " is empty.") } else ...{ textCollection[textCollection.length] = colInput[i].id + " | " + colInput[i].value; } } } alert(textCollection);} //--> </script> </body></html>