innerHTML未隐藏在javascript验证中

您好，在上面的代码中，我试图做的是，如果满足

currentCourseO.value==”

，则显示其字符串消息，但不显示

newCourseMsgO

的字符串消息

如果未满足

currentCourseO.value==”

，则显示

newCourseMsgO

的字符串，即

newCourseMsgO.innerHTML=“请在编辑中填写课程ID”如果满足此验证

目前，当满足
currentCourseO.value==”
时，它没有隐藏
newCourseMsgO
的字符串。请用javascript给我一个答案。
听起来你的两个if-else语句应该连接起来，现在它们并不相互依赖。试试这个：

function editvalidation() {

    var isDataValid = true;

    var currentCourseO = document.getElementById("currentCourseNo");
    var newCourseNoO = document.getElementById("newCourseNo");

    var currentCourseMsgO = document.getElementById("currentAlert");
    var newCourseMsgO = document.getElementById("newAlert");


    if (currentCourseO.value == "") {
        currentCourseMsgO.innerHTML = "Please Select a Course to edit from the Course Drop Down Menu";
        newCourseMsgO.innerHTML = "";
        isDataValid = false; 
    } else {
        currentCourseMsgO.innerHTML = ""; 
    }


    if (newCourseNoO.value == "") {
        newCourseMsgO.innerHTML = "Please fill in the Course ID in your Edit";
        isDataValid = false;
    } else {
        newCourseMsgO.innerHTML = ""; 
    }


    return isDataValid;

}

if (currentCourseO.value == "") {
    currentCourseMsgO.innerHTML = "Please Select a Course to edit from the Course Drop Down Menu";
    newCourseMsgO.innerHTML = "";
    isDataValid = false; 
} else {
    if (newCourseNoO.value == "") {
        newCourseMsgO.innerHTML = "Please fill in the Course ID in your Edit";
        isDataValid = false;
    } else{
        newCourseMsgO.innerHTML = ""; 
    }
}