<form name="form1" method="post" action="register_step2.php">
<input name=user_id>
<input class=button name=submit type=button value=提交 onclick=formCheck()>
</FORM>
<script>
function formCheck(){
var s=document.form1.user_id.value;
if(s==""||s.indexOf(" ")!=-1) {
alert("不能为空");
document.form1.user_id.select();
return;
}
form1.submit();
}
</script>
<input name=user_id>
<input class=button name=submit type=button value=提交 onclick=formCheck()>
</FORM>
<script>
function formCheck(){
var s=document.form1.user_id.value;
if(s==""||s.indexOf(" ")!=-1) {
alert("不能为空");
document.form1.user_id.select();
return;
}
form1.submit();
}
</script>
<input class=button name=submit type=button value=提交 onclick=formCheck()>function formCheck()
{
var s=document.form1.user_id.value;
for(var i=0;i<s.length;i++){
if(s.substr(i,1)==" ")
{
alert("不能为空");
document.form1.user_id.focus();
return;
}
}
form1.submit();
}
<input name=user_id>
<input class=button name=submit2 type=button value=提交 onclick=formCheck()>
</FORM>
<script>
function formCheck(){
var s=document.form1.user_id.value;
if(s==""||s.indexOf(" ")!=-1) {
alert("不能为空");
document.form1.user_id.select();
return;
}
form1.submit();
}
</script>
<input name=user_id>
<input class=button name=submit2 type=button value=提交 onclick=formCheck()>
</FORM>
<script>
function formCheck(){
var s=document.form1.user_id.value;
if(s==""||s.indexOf(" ")!=-1) {
alert("不能为空");
document.form1.user_id.select();
return;
}
form1.submit();
}
</script>