让我们展示我的功能:
function checkEligibility(elementID) {
// get the hons subject code choosen
var elt = document.getElementById(elementID);
var honssubcode = document.getElementById(elementID).value;
var sys_form_no = document.getElementById("sys_form_no").value;
var errorflag = false;
if(elementID.value == 19 || elementID.value == 110){
document.getElementById(elementID+"_div").style.display = 'none';
document.getElementById(elementID+"_marks").value = "";
document.getElementById(elementID+"_error").innerHTML = "";
return false;
}
if(elementID == 'general_choice'){
document.getElementById(elementID+"_div").style.display = 'inline';
document.getElementById(elementID+"_preview").innerHTML = elt.options[elt.selectedIndex].text;
return false;
}
// Lets check if the choice is unique
if(elementID == 'hons_pref_sub1') {
if(document.getElementById("hons_pref_sub2").value == honssubcode ||
document.getElementById("hons_pref_sub3").value == honssubcode)
{
errorflag = true;
}
}
else if(elementID == 'hons_pref_sub2') {
if(document.getElementById("hons_pref_sub1").value == honssubcode ||
document.getElementById("hons_pref_sub3").value == honssubcode)
{
errorflag = true;
}
}
else if(elementID == 'hons_pref_sub3'){
if(document.getElementById("hons_pref_sub1").value == honssubcode ||
document.getElementById("hons_pref_sub2").value == honssubcode)
{
errorflag = true;
}
}
else{
document.getElementById(elementID+"_error").innerHTML = "";
}
// now decide what to do
if(errorflag)
{
document.getElementById(elementID).options[0].selected = true;
document.getElementById(elementID+"_marks").value = "";
document.getElementById(elementID+"_error").innerHTML = "This Subject Already Choosen!";
document.getElementById(elementID+"_div").style.display = 'none';
}
else
{
var xmlhttp;
if (window.XMLHttpRequest)
{// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
}
else
{// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function()
{
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{
var myarray=eval(xmlhttp.responseText);
// processing block if any
if(myarray[0] == '1') {
document.getElementById(elementID+"_marks").value = myarray[1];
document.getElementById(elementID+"_div").style.display = 'inline';
document.getElementById(elementID+"_preview").innerHTML = elt.options[elt.selectedIndex].text;
document.getElementById(elementID+"_preview_marks").innerHTML = myarray[1];
}else{
document.getElementById(elementID+"_marks").value = "";
document.getElementById(elementID).options[0].selected = true;
}
// Show the message returned by checkeligibility.php
document.getElementById(elementID+"_error").innerHTML = myarray[2];
// processing sub block ends
}
}
var url="checkeligibility.php";
url=url+"?sub_id="+honssubcode+"&sys_form_no="+sys_form_no;
url=url+"&sid="+Math.random();
xmlhttp.open("GET",url,true);
xmlhttp.send(null);
} //end else
}// end function
如果出现错误,我想退出以下两项检查:
if(elementID.value == 19 || elementID.value == 110) {
document.getElementById(elementID+"_div").style.display = 'none';
document.getElementById(elementID+"_marks").value = "";
document.getElementById(elementID+"_error").innerHTML = "";
return false;
}
if(elementID == 'general_choice') {
document.getElementById(elementID+"_div").style.display = 'inline';
document.getElementById(elementID+"_preview").innerHTML = elt.options[elt.selectedIndex].text;
return false;
}
我该怎么办?实际上,退出该代码块是强制性的,否则下面的代码将被执行并破坏业务逻辑。请帮忙。
答案 0 :(得分:0)
满足要求退出的条件时返回