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if(!document.getElementById("radio1").checked)
{
alert('You must select one');
document.getElementById("radio1").focus();
return false;
}
if(!document.getElementsByName("radio1")[0].checked)
{
alert('You must select one');
document.getElementById("radio1").focus();
return false;
}
<SCRIPT>
function check() {
if(document.all.idcheckbox == null)
return;
var numRow = document.all.idcheckbox.length;
var index = 0;
if(numRow != null ){
for (var i = 0; i < numRow; i++) {
if (eval("document.all.idcheckbox[" + i + "].checked") == true){
index ++;
}
}
if(index ==0) {
alert("请选择记录");
}
}
}
</SCRIPT>
<input name="idcheckbox" id="idcheckbox" type="radio" >1</br>
<input name="idcheckbox" id="idcheckbox" type="radio" >2</br>
<input name="idcheckbox" id="idcheckbox" type="radio" >3</br>
<input name="idcheckbox" id="idcheckbox" type="radio" >4</br>
<input name="idcheckbox" id="idcheckbox" type="radio" >5</br>
<input name="idcheckbox" id="idcheckbox" type="radio" >6</br>
<input name="idcheckbox" id="idcheckbox" type="radio" >7</br>
<input name="idcheckbox" id="idcheckbox" type="radio" >8</br>
<input value="测试" onClick=" check();" type="button" ></br>