I am trying to build a progressbar trying to periodically run an ajax call from the client side while a postback is occuring.
However, it seems like the ajax call gets blocked, maybe because of to the postback. When the postback is finished, the http request with the ajax calls goes from pending to canceled.
Questions:
Is it impossible to issue ajax calls during postback?
Can I use the Session like I am doing in the following code example to keep track of the progress?
The webpage aspx:
<%# Page Language="C#" AutoEventWireup="true"
CodeBehind="TestProgressIndicator.aspx.cs"
Inherits="Test.TestProgressIndicator" %>
<!DOCTYPE html>
<html>
<head>
<script src="//code.jquery.com/jquery-3.2.1.min.js"
type="text/javascript"></script>
<script type="text/javascript">
function start_progress()
{
var indicator = $(".progress-indicator");
indicator.show();
var num_div = indicator.find(".num");
num_div.text("0%");
setTimeout(update_progress, 80);
function update_progress()
{
console.log("update_progress");
$.post(
"Ajax/ProgressBarCallback.aspx"
, function (progress)
{
num_div.text(progress + "%");
if (progress < 100)
setTimeout(update_progress, 80);
else
indicator.hide();
});
}
}
</script>
</head>
<body>
<form runat="server">
<asp:ScriptManager runat="server"/>
<div class="progress-indicator">
<div class="num"></div>
</div>
<asp:Button ID="btnStart" runat="server" Text="Starta"
OnClientClick="start_progress()" OnClick="btnStart_OnClick" />
</form>
</body>
</html>
Ajax/ProgressBarCallback.aspx:
<%# Page Language="C#" %>
<script runat="server">
void Page_Load(object sender, EventArgs e)
{
var progressObj = HttpContext.Current.Session["progress"];
var progress = progressObj != null ? int.Parse(progressObj.ToString()) : 0;
Response.ContentType = "text/json";
Response.Write(progress);
}
</script>
I am aware of this post being a duplicate of ASP.NET making AJAX calls during long Postback but it was 5 years since asked and it did not get any explanatory answers.
I have created a user control which actually creates an empty dialog box for application form. I wanted to render this user control on the click event of a button(like we render partial views). I have an .aspx page that contains a button. On clicking the button the user control that creates a dialog, opens up. Below is the jquery code written to open the dialog in a user control:
Jquery
createAliasPopUpForm: function (rowNumberId) {
// debugger;
var self = this;
var dat = $("input[id*='hdnAliasRecordmetaData']").val();
self.metaDataColumns = JSON.parse(dat);
//debugger;
// now bind update data to pop up
if (self.metaDataColumns.length > 0) {
if (rowNumberId != 'undefined' && rowNumberId != null) {
self.rowNumber = rowNumberId;
// fill alias record to meta data
var listdata = $("input[id*='hdnAliasRecordList']").val();
var aliasList = JSON.parse(listdata);
if (aliasList.Rows.length > 0) {
$.each(aliasList.Rows, function (i, val) {
if (this.RowNumber == rowNumberId) {
self.fillAliasRecord(self.metaDataColumns, this.Columns);
return false;
}
});
}
}
else {
// right now cloumn list has MDM record value so need to clear that value only
$.each(self.metaDataColumns, function (i, val) {
this.Value = '';
});
}
// sort array
//self.metaDataColumns.sort(common.dynamicSortMultiple("GroupOrder", "MetadataId"));
self.metaDataColumns.sort(common.dynamicSortMultiple("GroupOrder", "ColumnNumber"));
self.createPopupHtml(self.metaDataColumns, rowNumberId);
self.init();
$('#popUpHeader').find('h4').remove();
$('#popUpHeader').append(' <h4 class="modal-title" >Alias Record</h4>');
$("#updateConfirmPopUp").dialog({
autoOpen: true,
width: 600,
resizable: false,
draggable: false,
modal: true,
show: { effect: 'blind' }
});
}
},
userControl
<%# Control Language="C#" AutoEventWireup="true" CodeFile="AddAlias.ascx.cs" Inherits="OCM.Phoenix.WebToolsFramework.Server.Modules.MDMAdmin.AddAlias" %>
<script language="javascript" type="text/javascript" src='<%= ResolveClientUrl("~/scripts/jquery-1.4.2.min.js") %>'></script>
<script language="javascript" src="../Scripts/jquery.js" type="text/javascript"></script>
<script language="javascript" src="../Scripts/jquery-ui.js" type="text/javascript"></script>
<script language="javascript" src="../Scripts/bootstrap.min.js" type="text/javascript"></script>
<script language="javascript" src="../Scripts/Common.js" type="text/javascript"></script>
<script language="javascript" src="../Scripts/AdminEdit.js" type="text/javascript"></script>
<asp:HiddenField ID="hdnAliasRecordmetaData" runat="server" />
<asp:HiddenField ID="hdnAliasRecordList" runat="server" />
<script>
$(function () {
adminEditForm.createAliasPopUpForm();
});
</script>
code behind file just contains the load event
aspx page
<%# Page Language="C#" AutoEventWireup="true" CodeFile="AddAliasPage.aspx.cs" Inherits="Modules_MDMDataHub_AddAliasPage" %>
<%# Register Src="UserControls/AddAlias.ascx" TagPrefix="uc" TagName="alias" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<script src="Scripts/jquery.js"></script>
<script src="Scripts/jquery-ui.js"></script>
<script src="Scripts/AdminEdit.js"></script>
<body>
<form id="form1" runat="server">
<div>
<uc:alias ID="alias" runat="server" />
<br />
<asp:button ID="btn1" OnClick="btn1_Click" runat="server"> </asp:button>
</div>
</form>
</body>
</html>
Although, I have created the click event of the button, that calls the below function to render the html of the user control. but its actuaaly not working as it keeps giving me an errer as the hdnmetadatavalue must be inside the form tag. I did it but still i get the error. Am i doing something wrong here? Please help
private string RenderControl()
{
var sb = new System.Text.StringBuilder();
using (var stWriter = new System.IO.StringWriter(sb))
using (var htmlWriter = new HtmlTextWriter(stWriter))
{
var p = new Page();
var ctrl = (AddAlias)p.LoadControl("~/Modules/MDMDataHub/UserControls/AddAlias.ascx");
ctrl.Visible = true;
// do your own init logic if needed
p.Controls.Add(ctrl);
ctrl.RenderControl(htmlWriter);
return sb.ToString();
}
}
By reviewing your code:
var ctrl = (AddAlias)p.LoadControl("~/Modules/MDMDataHub/UserControls/AddAlias.ascx");
// ... other lines
ctrl.RenderControl(htmlWriter);
I assume you are trying to call RenderControl method for user control to HTML rendering, where the page will raise form tag exception if the user control was rendered outside defined form tag with runat="server".
Use Page.VerifyRenderingInServerForm method on page code behind to ensure all user controls render properly:
public override void VerifyRenderingInServerForm(Control control) {
// nothing to override here
}
public override boolean EnableEventValidation {
get { return false; }
}
Reference: UserControl's RenderControl is asking for a form tag in (C# .NET)
I am building a multilingual web application in which i have a .aspx.cs file
public partial class example:System.Web.UI.Page
{
private string message="message to be displayed depending on user language";
public string Message
{
get{return message;}
set{}
}
}
and a .aspx file in which i have linked a javascript file for validating user input
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<script type="text/javascript" src="Scripts/DataValidation.js"></script>
</head>
<body>
<form id="form1" runat="server" onsubmit="return validation()">
<asp:TextBox ID="tbSupplierName" CssClass="marginspace" runat="server" Width="150px" MaxLength="30"></asp:TextBox>
<asp:Button ID="btnSearch" runat="server" Text="Search"
onclick="btnSearch_Click" />
</form>
</body>
</html>
my DataValidation.js file loks like this
function validation()
{
var SupplierName = document.getElementById('tbSupplierName');
if (SupplierName.value.length == 0)
{
alert('please enter supplier name');//here i want to display server side variable 'message'
return false;
}
}
The problem is i want to pass my server side variable 'message' to the linked external javascript file DataValidation.js and display it in alert
I have tried below code but it is not working
function validation()
{
var message='<%=Message%>';
var SupplierName = document.getElementById('tbSupplierName');
if (SupplierName.value.length == 0)
{
alert(message);
return false;
}
}
Help me to solve the problem.Thanks in advance.
You can declare global JavaScript variable in your ASP.NET page
<script>
message='<%=Message%>';
</script>
Then you can use it directly in JS file
function validation() {
var SupplierName = document.getElementById('tbSupplierName');
if (SupplierName.value.length == 0) {
alert(message);
return false;
}
}
I have a simple contact form in aspx.
I want to validate the reCaptcha (client-side) before submitting the form.
Please help.
Sample code:
<%# Page Language="VB" AutoEventWireup="false" CodeFile="Default2.aspx.vb" Inherits="Default2" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Test Form</title>
<link rel="stylesheet" href="//code.jquery.com/ui/1.11.2/themes/smoothness/jquery-ui.css">
<script src="//code.jquery.com/jquery-1.10.2.js"></script>
<script src="//code.jquery.com/ui/1.11.2/jquery-ui.js"></script>
<link rel="stylesheet" href="/resources/demos/style.css">
<script src="https://www.google.com/recaptcha/api.js" async defer></script>
<script>
$("#cmdSubmit").click(function () {
//need to validate the captcha
});
</script>
</head>
<body>
<form id="form1" runat="server">
<label class="clsLabe">First Name<sup>*</sup></label><br />
<input type="text" id="txtFName" name="txtFName" class="clsInput" /><br />
<div class="g-recaptcha" data-sitekey="my_key"></div>
<img id="cmdSubmit" src="SubmitBtn.png" alt="Submit Form" style="cursor:pointer;" />
</form>
</body>
</html>
I want to validate the captcha on cmdSubmit click.
Please help.
This Client side verification of reCaptcha - the following worked for me :
if reCaptcha is not validated on client side grecaptcha.getResponse(); returns null, else is returns a value other than null.
Javascript Code:
var response = grecaptcha.getResponse();
if(response.length == 0)
//reCaptcha not verified
else
//reCaptch verified
Use this to validate google captcha with simple javascript.
This code at the html body:
<div class="g-recaptcha" id="rcaptcha" style="margin-left: 90px;" data-sitekey="my_key"></div>
<span id="captcha" style="margin-left:100px;color:red" />
This code put at head section on call get_action(this) method form button:
function get_action(form)
{
var v = grecaptcha.getResponse();
if(v.length == 0)
{
document.getElementById('captcha').innerHTML="You can't leave Captcha Code empty";
return false;
}
else
{
document.getElementById('captcha').innerHTML="Captcha completed";
return true;
}
}
If you render the Recaptcha on a callback
<script src="https://www.google.com/recaptcha/api.js?onload=onloadCallback&render=explicit" async defer></script>
using an empty DIV as a placeholder
<div id='html_element'></div>
then you can specify an optional function call on a successful CAPTCHA response
var onloadCallback = function() {
grecaptcha.render('html_element', {
'sitekey' : 'your_site_key',
'callback' : correctCaptcha
});
};
The recaptcha response will then be sent to the 'correctCaptcha' function.
var correctCaptcha = function(response) {
alert(response);
};
All of this was from the Google API notes :
Google Recaptcha v2 API Notes
I'm a bit unsure why you would want to do this. Normally you would send the g-recaptcha-response field along with your Private key to safely validate server-side. Unless you wanted to disable the submit button until the recaptcha was sucessful or such - in which case the above should work.
Hope this helps.
Paul
Simplified Paul's answer:
Source:
<script src="https://www.google.com/recaptcha/api.js"></script>
HTML:
<div class="g-recaptcha" data-sitekey="YOUR_KEY" data-callback="correctCaptcha"></div>
JS:
var correctCaptcha = function(response) {
alert(response);
};
I used HarveyEV's solution but misread it and did it with jQuery validate instead of Bootstrap validator.
<script src="http://ajax.aspnetcdn.com/ajax/jquery.validate/1.14.0/jquery.validate.min.js"></script>
<script>
$("#contactForm").validate({
submitHandler: function (form) {
var response = grecaptcha.getResponse();
//recaptcha failed validation
if (response.length == 0) {
$('#recaptcha-error').show();
return false;
}
//recaptcha passed validation
else {
$('#recaptcha-error').hide();
return true;
}
}
});
</script>
I thought all of them were great but I had troubles actually getting them to work with javascript and c#. Here is what I did. Hope it helps someone else.
//put this at the top of the page
<script src="https://www.google.com/recaptcha/api.js"></script>
//put this under the script tag
<script>
var isCaptchaValid = false;
function doCaptchaValidate(source, args) {
args.IsValid = isCaptchaValid;
}
var verifyCallback = function (response) {
isCaptchaValid = true;
};
</script>
//retrieved from google and added callback
<div class="g-recaptcha" data-sitekey="sitekey" data-callback="verifyCallback">
//created a custom validator and added error message and ClientValidationFucntion
<asp:CustomValidator runat="server" ID="CustomValidator1" ValidationGroup="Initial" ErrorMessage="Captcha Required" ClientValidationFunction="doCaptchaValidate"/>
Unfortunately, there's no way to validate the captcha on the client-side only (web browser), because the nature of captcha itself requires at least two actors (sides) to complete the process.
The client-side - asks a human to solve some puzzle, math equitation, text recognition, and the response is being encoded by an algorithm alongside with some metadata like captcha solving timestamp, pseudo-random challenge code.
Once the client-side submits the form with a captcha response code, the server-side needs to validate this captcha response code with a predefined set of rules, ie. if captcha solved within 5 min period, if the client's IP addresses are the same and so on.
This a very general description, how captchas works, every single implementation (like Google's ReCaptcha, some basic math equitation solving self-made captchas), but the only one thing is common - client-side (web browser) captures users' response and server-side (webserver) validates this response in order to know if the form submission was made by a human or a robot.
NB. The client (web browser) has an option to disable the execution of JavaScript code, which means that the proposed solutions are completely useless.
you can render your recaptcha using following code
<div id="recapchaWidget" class="g-recaptcha"></div>
<script type="text/javascript">
var widId = "";
var onloadCallback = function ()
{
widId = grecaptcha.render('recapchaWidget', {
'sitekey':'Your Site Key'
});
};
</script>
<script src="https://www.google.com/recaptcha/api.js?onload=onloadCallback&render=explicit" async defer></script>
Then you can validate your recaptcha by using "IsRecapchaValid()" method as follows.
<script type="text/javascript">
function IsRecapchaValid()
{
var res = grecaptcha.getResponse(widId);
if (res == "" || res == undefined || res.length == 0)
{
return false;
}
return true;
}
</script>
Source Link
You can simply check on client side using
grecaptcha.getResponse() method
var rcres = grecaptcha.getResponse();
if(rcres.length){
grecaptcha.reset();
showHideMsg("Form Submitted!","success");
}else{
showHideMsg("Please verify reCAPTCHA","error");
}
I used Palek's solution inside a Bootstrap validator and it works. I'd have added a comment to his but I don'y have the rep;). Simplified version:
$('#form').validator().on('submit', function (e) {
var response = grecaptcha.getResponse();
//recaptcha failed validation
if(response.length == 0) {
e.preventDefault();
$('#recaptcha-error').show();
}
//recaptcha passed validation
else {
$('#recaptcha-error').hide();
}
if (e.isDefaultPrevented()) {
return false;
} else {
return true;
}
});
Here's how we were able to validate the RECAPTCHA using .NET:
FRONT-END
<div id="rcaptcha" class="g-recaptcha" data-sitekey="[YOUR-KEY-GOES-HERE]" data-callback="onFepCaptchaSubmit"></div>
BACK-END:
public static bool IsCaptchaValid(HttpRequestBase requestBase)
{
var recaptchaResponse = requestBase.Form["g-recaptcha-response"];
if (string.IsNullOrEmpty(recaptchaResponse))
{
return false;
}
string postData = string.Format("secret={0}&response={1}&remoteip={2}", "[YOUR-KEY-GOES-HERE]", recaptchaResponse, requestBase.UserHostAddress);
byte[] data = System.Text.Encoding.ASCII.GetBytes(postData);
HttpWebRequest request = (HttpWebRequest)WebRequest.Create("https://www.google.com/recaptcha/api/siteverify");
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
request.ContentLength = data.Length;
using (var stream = request.GetRequestStream())
{
stream.Write(data, 0, data.Length);
}
var response = (HttpWebResponse)request.GetResponse();
var responseString = "";
using (var sr = new System.IO.StreamReader(response.GetResponseStream()))
{
responseString = sr.ReadToEnd();
}
return System.Text.RegularExpressions.Regex.IsMatch(responseString, "\"success\"(\\s*?):(\\s*?)true", System.Text.RegularExpressions.RegexOptions.Compiled);
}
Call the above method within your Controller's POST action.
If you just want to avoid a trip to the server when the user hasn't even attempted the reCAPTCHA, put a validate function in the onsubmit action:
<form id="start_game" action="start-game" method="post" onsubmit="return validate_form();">
And then make that function something like this:
function validate_form() {
const recaptcha_box_checked = (grecaptcha.getResponse()) ? true : false;
if (recaptcha_box_checked) {
return true;
}
else {
alert("You must check the 'I am not a robot' box before you can start a game!");
return false;
}
}
Now, the user could certainly subvert this, but your backend is going to check the g-recaptcha-response with a google server using your secret key. This just stops the user from having to go through another page or two when she simply forgets to check the box.
You cannot validate alone with JS only. But if you want to check in the submit button that reCAPTCHA is validated or not that is user has clicked on reCAPTCHA then you can do that using below code.
let recaptchVerified = false;
firebase.initializeApp(firebaseConfig);
firebase.auth().languageCode = 'en';
window.recaptchaVerifier = new firebase.auth.RecaptchaVerifier('recaptcha-container',{
'callback': function(response) {
recaptchVerified = true;
// reCAPTCHA solved, allow signInWithPhoneNumber.
// ...
},
'expired-callback': function() {
// Response expired. Ask user to solve reCAPTCHA again.
// ...
}
});
Here I have used a variable recaptchVerified where I make it initially false and when Recaptcha is validated then I make it true.
So I can use recaptchVerified variable when the user click on the submit button and check if he had verified the captcha or not.
if (typeof grecaptcha !== 'undefined' && $("#dvCaptcha").length > 0 && $("#dvCaptcha").html() == "") {
dvcontainer = grecaptcha.render('dvCaptcha', {
'sitekey': ReCaptchSiteKey,
'expired-callback' :function (response){
recaptch.reset();
c_responce = null;
},
'callback': function (response) {
$("[id*=txtCaptcha]").val(c_responce);
$("[id*=rfvCaptcha]").hide();
c_responce = response;
}
});
}
function callonanybuttonClick(){
if (c_responce == null) {
$("[id*=txtCaptcha]").val("");
$("[id*=rfvCaptcha]").show();
return false;
}
else {
$("[id*=txtCaptcha]").val(c_responce);
$("[id*=rfvCaptcha]").hide();
return true;
}
}
<div id="dvCaptcha" class="captchdiv"></div>
<asp:TextBox ID="txtCaptcha" runat="server" Style="display: none" />
<label id="rfvCaptcha" style="color:red;display:none;font-weight:normal;">Captcha validation is required.</label>
Captcha validation is required.
<%# Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<script src='https://www.google.com/recaptcha/api.js'></script>
<script type="text/javascript">
function get_action() {
var v = grecaptcha.getResponse();
console.log("Resp" + v);
if (v == '') {
document.getElementById('captcha').innerHTML = "You can't leave Captcha Code empty";
return false;
}
else {
document.getElementById('captcha').innerHTML = "Captcha completed";
return true;
}
}
</script>
</head>
<body>
<form id="form1" runat="server" onsubmit="return get_action();">
<div>
<div class="g-recaptcha" data-sitekey="6LeKyT8UAAAAAKXlohEII1NafSXGYPnpC_F0-RBS"></div>
</div>
<%-- <input type="submit" value="Button" />--%>
<asp:Button ID="Button1" runat="server"
Text="Button" />
<div id="captcha"></div>
</form>
</body>
</html>
It will work as expected.
I lost the web session when i tried window.location.replace("webform2.aspx") from webform1.
I tried href as well. Also I passed "/webform2.aspx" as a paramaeter.
However the session is lost on the redirection.
Can anyone help.
Webform1.aspx
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title></title>
<script type="text/javascript">
function pageload() {
window.location.href("/webform2.aspx");
}
</script>
</head>
<body onload="pageload()">
<form id="form1" runat="server" >
</form>
</body>
</html>
WebForm1.aspx.cs
protected void Page_Load(object sender, EventArgs e)
{
string str = this.Session.SessionID;
}
Webform2.aspx just an empty form and having the aspx.cs as the above code to note session id by debugging.
Update:
I maanged to acheive using the below code. However I just keep this question open to know redirection with relative URL(without session id) lose the session. One more point here is I made cookieless as true hence only my url will have the session id.
var path = window.location.href;
var i = path.lastIndexOf("/") + 1;
var loc = path.substring(0, i ).concat("webform2.aspx");
window.location.href(loc);
I used cookieless session and hence a relative URL redirection doesnt have knowledge about session, hence a new session is initiated.
I used below code to overcome the problem.
var path = window.location.href;
var i = path.lastIndexOf("/") + 1;
var loc = path.substring(0, i ).concat("webform2.aspx");
window.location.href(loc);