当前位置：Gxlcms >
PHP教程 >
php-JS判断文本框是否是空的问题，为什么我的代码不能判断，就指点
php-JS判断文本框是否是空的问题，为什么我的代码不能判断，就指点
时间：2021-07-01 10:21:17
帮助过：3人阅读
phphtmljavascrpit
$conn = mysql_connect ( 'localhost', 'root', 'admin' ) or die ( 'could not connect: ' . mysql_error () );
mysql_select_db ( 'sybgtjxt' ) or die ( 'could not select database' );
mysql_query ( "set names gbk" );
?>
实验报告提交系统
h2, font { font-style: oblique; color: #FCC898; font-weight: normal id=top; valign =top; position: relative;}function YanZheng() { var cname = document.getElementById("cname").value; var tname = document.getElementById("tname").value; var ppro = document.getElementById("ppro").value; var pgrade = document.getElementById("pgrade").value; var pcol = document.getElementById("pcol").value; //var pcutdate = document.getElementById("pcutdate").value; var pname = document.getElementById("pname").value; var paim = document.form1.paim.value; var pcontent = document.getElementById("pcontent").value; var pstep = document.getElementById("pstep").value; var panalyse = document.getElementById("panalyse").value; var presult = document.getElementById(" presult").value; //这个功能没实现 if (cname=="") { window.alert("请输入所有内容"); return false; } } function Reset() { document.getElementById("cname").value = ""; document.getElementById("tname").value = 0; document.getElementById("ppro").value = 0; document.getElementById("pgrade").value = 0; document.getElementById("pcol").value = 0; document.getElementById("pcutdate").value = ""; document.getElementById("pname").value = ""; document.getElementById("paim").value = ""; document.getElementById("pcontent").value = ""; document.getElementById("pstep").value = ""; document.getElementById("panalyse").value = ""; document.getElementById("presult").value = ""; } function YYYYMMDDstart() { MonHead = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]; //先给年下拉框赋内容 var y = new Date().getFullYear(); for (var i = (y-30); i < (y+30); i++) //以今年为准，前30年，后30年 document.form1.YYYY.options.add(new Option(" "+ i, i)); //赋月份的下拉框 for (var i = 1; i < 13; i++){ if(i>=1&&i<10) document.form1.MM.options.add(new Option(" " +"0"+i, i));else{ document.form1.MM.options.add(new Option(" "+i, i));} } document.form1.YYYY.value = y; document.form1.MM.value = new Date().getMonth() + 1; var n = MonHead[new Date().getMonth()]; if (new Date().getMonth() ==1 && IsPinYear(YYYYvalue)) n++; writeDay(n); //赋日期下拉框 document.form1.DD.value = new Date().getDate(); } if(document.attachEvent) window.attachEvent("onload", YYYYMMDDstart); else window.addEventListener('load', YYYYMMDDstart, false); function YYYYDD(str) //年发生变化时日期发生变化(主要是判断闰平年) { var MMvalue = document.form1.MM.options[document.form1.MM.selectedIndex].value; if (MMvalue == ""){ var e = document.form1.DD; optionsClear(e); return;} var n = MonHead[MMvalue - 1]; if (MMvalue ==2 && IsPinYear(str)) n++; writeDay(n) } function MMDD(str) //月发生变化时日期联动 { var YYYYvalue = document.form1.YYYY.options[document.form1.YYYY.selectedIndex].value; if (YYYYvalue == ""){ var e = document.form1.DD; optionsClear(e); return;} var n = MonHead[str - 1]; if (str ==2 && IsPinYear(YYYYvalue)) n++; writeDay(n) } function writeDay(n) //据条件写日期的下拉框 { var e = document.form1.DD; optionsClear(e); for (var i=1; i<(n+1); i++) e.options.add(new Option(" "+ i, i)); } function IsPinYear(year)//判断是否闰平年 { return(0 == year%4 && (year%100 !=0 || year%400 == 0)); } function optionsClear(e) { e.options.length = 1; }
onsubmit="return YanZheng();">
