输入框的检测问题,也许有点难,,请高手指点
有50多个输入框，而输入框的name就是后面的数字不同，如：
<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= "product55 " type= "text " value= " ">
<input name= "product56 " type= "text " value= " ">
而我想实现用JAVASCRIPT检测每个输入框是否为空，
传统做法是一个个地写代码：
if (theForm.product1.value == " " )
{
alert( "请填写产品1。 ");
theForm.product1.focus();
return (false);
}
if (theForm.product2.value == " " )
{
alert( "请填写产品2。 ");
theForm.product2.focus();
return (false);
}
……
可是我想实现不用一个个地写，，有没有什么数组或参数，，写一个，然后用JAVASCRIPT循环检测。
if (theForm.product[i].value == " " )
{
alert( "请填写产品 "+[i]+ "。 ");
theForm.product[i].focus();
return (false);
}
所以想请教高手，这个代码怎么写呀？？
[解决办法]
<script>
function aa(){
var b=document.getElementsByTagName( "input ")
for(var i=0;i <b.length;i++){
if(b[i].type== "text "){
if(b[i].name.length> 7){
if(b[i].name.substr(0,7)== "product "){
alert(b[i].name)
alert(b[i].value)
}
}
}
}
}
</script>
<input name= "product1 " type= "text " value= " " onclick= "aa() ">
<input name= "product2 " type= "text " value= " ">
<input name= "product3 " type= "text " value= " ">
<input name= "product4 " type= "text " value= " ">
[解决办法]
循环i,不可出错哦!
document.product[i].value == " "
-------------------------
www.jw112.com
[解决办法]
document.all.product[i].value == " "
[解决办法]
<form action=11.asp method=post onsubmit= "return ss(); ">
<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= "product5 " type= "text " value= " ">
<input value= "提交 " type=submit>
</form>
<script>
function ss()
{
var textname
var state
//把i <5改成i <你的input数
for (i=0;i <5;i++)
{
textname = 'product ' + (i+1)
if (document.all(textname).value== ' ')
{
alert( '第 '+(i+1)+ '个商品为空 ');
state=1
document.all(textname).focus();
break;
}
}
if (state==1)
{return false;}
}
</script>
数字对应一下就好了～！
[解决办法]
最好别用数组，因为顺序问题谁也说不准。
var o;
for(var i=0;i <56;i++){
o=document.getElementById( "product "+i);
if (o.value == " " ){
alert( "请填写产品 "+i+ "。 ");
o.focus();
return (false);
}
}
