function checkbox(ename){
d = document.all[ename];//被选对象
n = document.getElementsByName(ename).length;
if(n > 1){
for(i = 0; i < n; i++){
if(d[i].checked){
return true;
}
}
}
else {
if(d.checked){
return true;
}
}alert("请选择操作对象!");
return false;}
d = document.all[ename];//被选对象
n = document.getElementsByName(ename).length;
if(n > 1){
for(i = 0; i < n; i++){
if(d[i].checked){
return true;
}
}
}
else {
if(d.checked){
return true;
}
}alert("请选择操作对象!");
return false;}
<input name=haha type=checkbox checked>
<input name=haha type=checkbox>
<script language=javascript>
function checkbox(ename){
d = document.all[ename];//被选对象
n = document.getElementsByName(ename).length;
if(n > 1){
for(i = 0; i < n; i++){
if(d[i].checked){
return true;
}
}
}
else{
if(d.checked){
return true;
}
}
alert("请选择操作对象!");
return false;}
alert(checkbox("haha"))
</script>
当所有checkbox都没有选中, 提示“请选择操作对象”?
如果是的, 试试看下面的效果对你有无用(还是用自己平时习惯书写舒服一点^_^)<script language=javascript>
function checkbox(){
var checkValue = false;
for(i=0; i<document.testform.chkbox.length; i++){
if(document.testform.chkbox[i].checked == true){
checkValue = true;
}
}
if(checkValue == false){
alert("请选择操作对象!");
}
else{
alert("OK");
}
}
</script><form name="testform" method="post">
<input type="checkbox" name="chkbox" >
<input type="checkbox" name="chkbox" >
<input type="checkbox" name="chkbox" >
<input type="button" name="btn" value="Btton" onclick="checkbox()" />
</form>