[英]How to retain current tab in a code slider after a postback in asp.net?
Im creating an asp.net booking page that has a coda slider effect,the page is also a content page of a master page, i have this JavaScript that allows the slider effect
<script>
var currentTab = 0; // Current tab is set to be the first tab (0)
showTab(currentTab); // Display the current tab
function showTab(n) {
// This function will display the specified tab of the form ...
var x = document.getElementsByClassName("tab");
x[n].style.display = "block";
// ... and fix the Previous/Next buttons:
if (n == 0) {
document.getElementById("prevBtn").style.display = "none";
document.getElementById("Submit").style.display = "none";
} else {
document.getElementById("prevBtn").style.display = "inline";
}
if (n == (x.length - 1)) {
document.getElementById("Submit").style.display = "inline";
document.getElementById("prevBtn").style.display = "none";
document.getElementById("nextBtn").style.display = "none";
} else {
document.getElementById("nextBtn").innerHTML = "Next";
}
// ... and run a function that displays the correct step indicator:
fixStepIndicator(n)
}
function nextPrev(n) {
// This function will figure out which tab to display
var x = document.getElementsByClassName("tab");
// Exit the function if any field in the current tab is invalid:
if (n == 1 && !validateForm()) return true;
// Hide the current tab:
x[currentTab].style.display = "none";
// Increase or decrease the current tab by 1:
currentTab = currentTab + n;
// if you have reached the end of the form... :
if (currentTab >= x.length) {
//...the form gets submitted:
document.getElementById("regForm").submit();
return false;
}
// Otherwise, display the correct tab:
showTab(currentTab);
}
function validateForm() {
// This function deals with validation of the form fields
var x, y, i, valid = true;
x = document.getElementsByClassName("tab");
y = x[currentTab].getElementsByTagName("input");
// A loop that checks every input field in the current tab:
for (i = 0; i < y.length; i++) {
// If a field is empty...
if (y[i].value == "") {
// add an "invalid" class to the field:
y[i].className += " invalid";
// and set the current valid status to false:
valid = false;
}
}
// If the valid status is true, mark the step as finished and valid:
if (valid) {
document.getElementsByClassName("step")[currentTab].className += " finish";
}
return valid; // return the valid status
}
function fixStepIndicator(n) {
// This function removes the "active" class of all steps...
var i, x = document.getElementsByClassName("step");
for (i = 0; i < x.length; i++) {
x[i].className = x[i].className.replace(" active", "");
}
//... and adds the "active" class to the current step:
x[n].className += " active";
}
</script>
問題是我有這個按鈕用於文件上傳控件,它執行回發以顯示 label 以顯示文件是否已上傳
<input type="submit" runat="server" class="btn btn-success" value="Upload File" onserverclick="Button1_Click"/>
但是頁面當前選項卡在回發后返回到第一個選項卡,我該如何防止這種情況發生? 這是我點擊“上傳文件”按鈕后運行的代碼
protected void Button1_Click(object sender, EventArgs e)
{
if (payment.HasFile)
{
string FileExtention = Path.GetExtension(payment.FileName);
if (FileExtention.ToLower() != ".pdf" && FileExtention.ToLower() != ".docx")
{
message2.Visible = true;
message3.Visible = false;
message.Visible = false;
message1.Visible = false;
}
else
{
int FileSize = payment.PostedFile.ContentLength;
if (FileSize > 2097152)
{
message3.Visible = true;
message2.Visible = false;
message.Visible = false;
message1.Visible = false;
}
else
{
payment.SaveAs(Server.MapPath("~/ApplicantUploads/" + payment.FileName));
message.Visible = true;
}
}
}
else
{
message1.Visible = true;
message3.Visible = false;
message.Visible = false;
message2.Visible = false;
}
}
作為一種通用技術,定義一個隱藏字段:
<asp:HiddenField ID="HiddenField" runat="server" value="" />
創建 javascript function 以保存當前選項卡 position:
function SaveTabPosition(position) {
document.getElementById('<%=HiddenField.ClientID%>').value = position;
}
當 POST 發生時,它還將存儲在 HiddenField 中的“currentTab”值發送回服務器。 在現在的響應中,您將不得不使用:
ScriptManager.RegisterStartupScript(this.Page, this.GetType(), "setTabPosition", "var currentTab="+HiddenField.Value, true);
現在,您應該在“currentTab”變量中將選項卡 position 放回客戶端。 順便提一下,“currentTab”應該是可訪問的。
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