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分享大虾 菜鸟都来看 JS小问题求解
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
</HEAD>
<SCRIPT LANGUAGE="JavaScript">
<!-- Begin
var checkflag = "false";
function check(field) {
if (checkflag == "false") {
for (i = 0; i < field.length; i++) {
field[i].checked = true;}
checkflag = "true";
return "Cancel All"; }
else {
for (i = 0; i < field.length; i++) {
field[i].checked = false; }
checkflag = "false";
return "Select All"; }
}
// End -->
</script>
<FORM name="form" METHOD=POST ACTION="test.asp">
<INPUT TYPE="checkbox" NAME="recordid" value='1'>
<INPUT TYPE="checkbox" NAME="recordid" value='2'>
<INPUT TYPE="button" name="selectall" value="Select All" onClick="this.value=check(this.form.recordid)">
</FORM>
<BODY>
</BODY>
</HTML>
当CHECKBOX两个或以上时候运行成功
<INPUT TYPE="checkbox" NAME="recordid" value='1'>
<INPUT TYPE="checkbox" NAME="recordid" value='2'>
而
<INPUT TYPE="checkbox" NAME="recordid" value='1'>
当CHECKBOX为一个时，按钮就没用了，怎么回事
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
</HEAD>
<SCRIPT LANGUAGE="JavaScript">
<!-- Begin
var checkflag = "false";
function check(field) {
if (checkflag == "false") {
for (i = 0; i < field.length; i++) {
field[i].checked = true;}
checkflag = "true";
return "Cancel All"; }
else {
for (i = 0; i < field.length; i++) {
field[i].checked = false; }
checkflag = "false";
return "Select All"; }
}
// End -->
</script>
<FORM name="form" METHOD=POST ACTION="test.asp">
<INPUT TYPE="checkbox" NAME="recordid" value='1'>
<INPUT TYPE="checkbox" NAME="recordid" value='2'>
<INPUT TYPE="button" name="selectall" value="Select All" onClick="this.value=check(this.form.recordid)">
</FORM>
<BODY>
</BODY>
</HTML>
当CHECKBOX两个或以上时候运行成功
<INPUT TYPE="checkbox" NAME="recordid" value='1'>
<INPUT TYPE="checkbox" NAME="recordid" value='2'>
而
<INPUT TYPE="checkbox" NAME="recordid" value='1'>
当CHECKBOX为一个时，按钮就没用了，怎么回事
...全文
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Myself_fu 2002-05-29
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When there are more than one checkboxes whose name are same, they will be looked as one array. But if there is only one checkbox, they will be looked as one element. In the later case, "field[i]" will cause error, for it can not be looked as one array. So you can give a judgement before your action.
If(field.length>1) ...
else ...
Ok,have a try!
If(field.length>1) ...
else ...
Ok,have a try!
