if (txtTitle!=null&&txtTitle.value == "") 这样的逻辑为了表达什么? 直接if (txtTitle.value == "") 不就得了吗?//输入框验证
function validateForm() {
var txtTitle = document.getElementById("Title");
var txtDescription = document.getElementById("Description");
var txtFileName = document.getElementById("videopath"); var isValid = true;
if (txtTitle!=null&&txtTitle.value == "")
isValid = false;
if (txtDescription!=null&&txtDescription.value == "")
isValid = false;
if (txtFileName.value == "")
isValid = false;
document.getElementById("btnSubmit").disabled = !isValid;
}
function validateForm() {
var txtTitle = document.getElementById("Title");
var txtDescription = document.getElementById("Description");
var txtFileName = document.getElementById("videopath"); var isValid = true;
if (txtTitle!=null&&txtTitle.value == "")
isValid = false;
if (txtDescription!=null&&txtDescription.value == "")
isValid = false;
if (txtFileName.value == "")
isValid = false;
document.getElementById("btnSubmit").disabled = !isValid;
}
function validateForm() {
var txtTitle = document.getElementById("Title");
var txtDescription = document.getElementById("Description");
var txtFileName = document.getElementById("videopath"); var isValid = true;
if (txtTitle!=null&&txtTitle.value == "")
isValid = false;
if (txtDescription!=null&&txtDescription.value == "")
isValid = false;
if (txtFileName.value == "")
isValid = false;
document.getElementById("btnSubmit").disabled = !isValid;