输入框的检测有关问题,真的有点难,请
日期：2014-05-16 浏览次数：20443 次
输入框的检测问题,真的有点难,请高手指点.
<script language= "JavaScript ">
function bb(){
var b=document.getElementsByTagName( "input ")
for(var i=0;i <b.length;i++){
if(b[i].name.substr(0,7)== "product "){
if(b[i].value== " "){
alert( "请产品 "+i+ "的值。 ");
//exit for
//b[i].name.focus();
return (false);
}
}
}
}
</script>
<form name= "form1 " action= "input.asp " onSubmit= "bb() ">
<input name= "product1 " type= "text " value= " " >
<input name= "product2 " type= "text " value= " ">
<input name= "product3 " type= "text " value= " ">
<input name= "product4 " type= "text " value= " ">
<input name= "rr " type= "submit " value= "OK ">
</form>
看看这里
alert( "请产品 "+i+ "的值。 ");
//exit for
//b[i].name.focus(); 注意这一行
return (false);
如何做到让alert确定后,退出FOR,且焦点落在product[i]中,并且不能提交？
------解决方案--------------------
<html>
<head>
<title>
dfjk </title>
</head>
<body>
<script language= "JavaScript ">
function bb(){
var b=document.getElementsByTagName( "input ")
for(var i=0;i <b.length;i++){
//这要加上 if(b[i].name.length> 7){这个判断，因为别的input的name可能没7个，.substr(0,7)的时候会出错
if(b[i].name.substr(0,7)== "product "){
if(b[i].value== " "){
alert( "请产品 "+(i+1)+ "的值。 ");
//exit for
b[i].focus();
return false;
}
}
}
return true
}
</script>
<form name= "form1 " action= "input.asp " onSubmit= "return bb() ">
<input name= "product1 " type= "text " value= " " >
<input name= "product2 " type= "text " value= " ">
<input name= "product3 " type= "text " value= " ">
<input name= "product4 " type= "text " value= " ">
<input name= "rr " type= "submit " value= "OK ">
</form>
</body>
</html>
<script language= "JavaScript ">
function bb(){
var b=document.getElementsByTagName( "input ")
for(var i=0;i <b.length;i++){
if(b[i].name.substr(0,7)== "product "){
if(b[i].value== " "){
alert( "请产品 "+i+ "的值。 ");
//exit for
//b[i].name.focus();
return (false);
}
}
}
}
</script>
<form name= "form1 " action= "input.asp " onSubmit= "bb() ">
<input name= "product1 " type= "text " value= " " >
<input name= "product2 " type= "text " value= " ">
<input name= "product3 " type= "text " value= " ">
<input name= "product4 " type= "text " value= " ">
<input name= "rr " type= "submit " value= "OK ">
</form>
看看这里
alert( "请产品 "+i+ "的值。 ");
//exit for
//b[i].name.focus(); 注意这一行
return (false);
如何做到让alert确定后,退出FOR,且焦点落在product[i]中,并且不能提交？
------解决方案--------------------
<html>
<head>
<title>
dfjk </title>
</head>
<body>
<script language= "JavaScript ">
function bb(){
var b=document.getElementsByTagName( "input ")
for(var i=0;i <b.length;i++){
//这要加上 if(b[i].name.length> 7){这个判断，因为别的input的name可能没7个，.substr(0,7)的时候会出错
if(b[i].name.substr(0,7)== "product "){
if(b[i].value== " "){
alert( "请产品 "+(i+1)+ "的值。 ");
//exit for
b[i].focus();
return false;
}
}
}
return true
}
</script>
<form name= "form1 " action= "input.asp " onSubmit= "return bb() ">
<input name= "product1 " type= "text " value= " " >
<input name= "product2 " type= "text " value= " ">
<input name= "product3 " type= "text " value= " ">
<input name= "product4 " type= "text " value= " ">
<input name= "rr " type= "submit " value= "OK ">
</form>
</body>
</html>
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