On the backend, I assign some data to Session.
Session["usedData"] = "sample data";
I am curious about how I can retrieve the Session value (in this case, "sample data") using JavaScript and then update Session["usedData"] with a new value.
On the backend, I assign some data to Session.
Session["usedData"] = "sample data";
I am curious about how I can retrieve the Session value (in this case, "sample data") using JavaScript and then update Session["usedData"] with a new value.
Using Javascript to Manage Session Variables in ASP.NET:
Setting a Session Variable with Javascript:
<script type="text/javascript">
function SetUserName()
{
var userName = "John Doe";
'<%Session["Username"] = "' + userName + '"; %>';
alert('<%=Session["Username"] %>');
}
</script>
Retrieving an ASP.NET Session variable using Javascript:
<script type="text/javascript">
function GetUserName()
{
var username = '<%= Session["Username"] %>';
alert(username );
}
</script>
It is not possible to directly access the Session in JavaScript.
One workaround is to create a hidden field and pass it to your page, then you can use JavaScript to retrieve the object using document.getElementById.
Give this a shot:
let sessionInfo = '<%=Session["userData"]%>';
Directly setting session values in Javascript is not possible. To achieve this, I make an ajax call from Javascript like this.
In my ASPx file or HTML code,
<script type="text/javascript">
$(function(){
//Retrieving session values and storing them in Javascript variables.
// This only works when the document is fully loaded.
var firstName = '<%= Session["FirstName"] ?? "" %>';
var lastName = '<%= Session["LastName"] ?? "" %>';
$("#FirstName").val(firstName);
$("#LastName").val(lastName);
$('Button').click(function(){
//Sending values to be saved in session
$.post(document.URL+'?mode=ajax',
{'FirstName':$("#FirstName").val(),
'LastName':$("#LastName").val()
} );
});
});
On the server side,
protected void Page_Load(object sender, EventArgs e)
{
if(Request.QueryString["mode"] != null && Request.QueryString["mode"] == "ajax")
{
//Storing posted variables in session
Session["FirstName"] = Request.Form["FirstName"] ?? "";
Session["LastName"] = Request.Form["LastName"] ?? "";
}
}
To retrieve session values, as mentioned by Shekhar and Rajeev
var firstName = '<%= Session["FirstName"] ?? "" %>';
I hope this explanation is useful.
When it comes to "client side JavaScript," retrieving session data directly is not possible.
Since the session data is stored on the server, client side code cannot access it without interacting with the server.
To retrieve the session data, you need to send an HTTP request and have a server side script handle the modification, retrieval, and return of the data.
Set a value to a concealed field within the backend file. Retrieve this value using javascript as you would any standard HTML element.
It is not possible to manipulate server-side session variables directly from Javascript. If you wish to accomplish this, you will need to utilize an AJAX request with a POST method to update the variable on the server. However, if selecting a car is a significant event, it may be more efficient to simply perform a POST action.
To begin, establish a method in the code-behind to initialize a session:
[System.Web.Services.WebMethod]
public static void InitializeSession(int value)
{
Page pageObj = new Page();
pageObj.Session["Value"] = value;
}
Next, invoke this method from the client-side:
function ModifySession(data) {
PageMethods.InitializeSession(data);
}
Ensure that EnablePageMethods is set to true:
<asp:ScriptManager EnablePageMethods="true" ID="MainSM" runat="server" ScriptMode="Release" LoadScriptsBeforeUI="true"></asp:ScriptManager>
If you are looking to access Session values in JavaScript, this code snippet will assist you:
<script type='text/javascript'>
var userID='@Session["userID"]';
</script>To update session data on the server post-page creation, one can utilize AJAX or JQuery to establish a connection with the server for modifying session data and fetching the returned data.
<?php
session_start();
$_SESSION['userData'] = "Some Value"; //initial setting
?>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Modifying PHP Session Data</title>
<script type='text/javascript'>
var userData = '<?php echo $_SESSION['userData']; ?>';
var previousDataValue = null;
function modifySession () {
var newValue = document.getElementById("newValueData").value;
var xhttp = window.XMLHttpRequest ? new XMLHttpRequest() : new ActiveXObject("Microsoft.XMLHTTP");
xhttp.onreadystatechange = function () {
if (this.readyState == 4 && this.status == 200) {
previousDataValue = userData;
userData = this.responseText;
document.getElementById("sessionValue").innerHTML = userData;
document.getElementById("sessionOldValue").innerHTML = previousDataValue;
}
};
xhttp.open("GET", "modifySession.php?newData="+newValue, true);
xhttp.send();
}
</script>
</head>
<body>
<h1><p>Modify Session</p></h1>
Current Value: <div id='sessionValue' style='display:inline'><?php echo $_SESSION['userData']; ?></div><br/>
Old Value: <div id='sessionOldValue' style='display:inline'><?php echo $_SESSION['userData']; ?></div><br/>
New Value: <input type='text' id='newValueData' /><br/>
<button onClick='modifySession()'>Change Value</button>
</body>
</html>
Creating a PHP script named modifySession.php is now necessary to adjust session data and potentially send it back.
<?php
session_start();
$_SESSION['userData'] = $_GET['newData'];
echo $_SESSION['userData'];
?>
Following these steps will allow you to effectively change session data using PHP/AJAX on the server-side.
Below is a solution that I found effective. In Javascript, you can use the following:
<script type="text/javascript">
var deptname = '';
</script>
In C# Code behind, you have the option to include this code on the master page so that it resets the variable on every page change.
String csname1 = "LoadScript";
Type cstype = p.GetType();
// Get a ClientScriptManager reference from the Page class.
ClientScriptManager cs = p.ClientScript;
// Check if the startup script is registered already.
if (!cs.IsStartupScriptRegistered(cstype, csname1))
{
String cstext1 = funct;
cs.RegisterStartupScript(cstype, csname1, "deptname = 'accounting'", true);
}
else
{
String cstext = funct;
cs.RegisterClientScriptBlock(cstype, csname1, "deptname ='accounting'",true);
}
You can add this code to a button click event to verify that the deptname has been changed successfully.
alert(deptname);
One way to handle this situation is by defining a property in the server side code and accessing it from JavaScript:
In the Server-side code :
Protected ReadOnly Property checkFieldEdited() As Boolean
Get
Return If((isFieldChanged), "true", "false")
End Get
Then, in the JavaScript section:
alert("The Field Edited Status: <%= checkFieldEdited %>" );
In my search for a solution to a problem, I stumbled upon a simple way to access session variables when using a .php file on the server side. Here is a snippet that might address part of your question:
Accessing session value
<script type="text/javascript>
var value = <?php echo $_SESSION['key']; ?>;
console.log(value);
</script>
Edit: Below is a better example that you can test on phpfiddle.org under the "codespace" tab:
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<?php
$_SESSION['key'] = 10;
$i = $_SESSION['key'];
?>
</head>
<body>
<p id="affichage">hello</p>
<script type="text/javascript>
var value = <?php echo $i; ?>;
$("#affichage").html(value);
</script>
</body>
</html>
Setting session value
You can assign any variable you want, like this:
$you = 13;
$_SESSION['user_id'] = $you;
This should work, although it has not been thoroughly tested.
Here's a clever workaround - send the value to the server side as a parameter:
<script>
var myVar = "hello"
window.location.href = window.location.href.replace(/[\?#].*|$/, "?param=" + myVar); //Pass the variable to the server side
</script>
On the server side, retrieve the parameter like so:
string myVar = Request.QueryString["param"];
Session["SessionName"] = myVar;
I hope this little trick proves useful!
I utilized my .php file to store necessary data in sessions
$_SESSION['name'] = $phparray["name"]; $ajaxoutput['name'] =$phparray["name"];
In my .js file, I implemented
sessionStorage.setItem("name", ajaxreturnedarray["name"]);
and then I retrieved this information using
var myName= sessionStorage.getItem("name");
in various .js files or the same ones.
If left unchanged, the stored data will persist even after logging out. Therefore, upon logout, I executed
sessionStorage.setItem("name", "");
This action effectively cleared the local variable. I employed this method on a single-page website for managing login/logout sessions and found it successful. I encourage you to try it and share your results with me.
I successfully tackled a similar issue by utilizing URL parameters and automatic page refresh.
By extracting the values from the URL parameters, you have the flexibility to manipulate them as needed before refreshing the page seamlessly.
Here's an example of how you can implement this approach:
<a href=\"webpage.aspx?parameterName=parameterValue"> LinkText </a>In C#, you can retrieve the parameter value like so:
string variable = Request.QueryString["parameterName"];
if (variable != null)
{
Session["sessionVariable"] += variable;
Response.AddHeader("REFRESH", "1;URL=webpage.aspx");
}<?php
session_start();
$_SESSION['mydata']="different content";
?>
<script>
var myseconddata="<?php echo $_SESSION['mydata'];?>";
</script>
There could be some potential in trying out this method. It appears to store the date as a session variable, although manipulating the string may pose some challenges.
ob_start();
?>
<script type="text/javascript">
var d = new Date();
document.write(d);
</script>
<?
$_SESSION["date"] = ob_get_contents();
ob_end_clean();
echo $_SESSION["date"]; // displays the date
echo substr($_SESSION["date"],28);
// displays 'script"> var d = new Date(); document.write(d);'
I attempted to solve the issue by implementing while(true) within the created method so that it constantly updates by sending frequent requests to Flask. Is there a different approach to updating my value? Vue: let app = Vue.createApp({ data ...
I'm feeling a bit disoriented with JavaScript. Here is the nested structure that's causing me trouble: { "value": 5, "children": [{ "value": 18, "children": [{ "value": 27, "children": [] } ...
Currently, I am still in the process of trying to integrate the angular 2 code mirror module into my angular 2 application. Previously, I faced some challenges with imports which I discussed in detail here, and managed to overcome them. However, a new iss ...
I am currently exploring methods to prevent an exploit where a user manipulates the URL, specifically in a GET request scenario. The following code represents a route on my Express router that processes incoming requests for a certain collection "A" and re ...
There is a click event that works perfectly in Firefox and IE 9 where the goal is to select an item from a dropdown, push the value into an array, display it in a div, and then parse the list in PHP on "submitList" click. If the value is empty, both the ar ...
After exploring different sources about cookies and sessions, I have decided to create a basic login system in nodejs using express with cookie/session management through redis as the data storage. I am curious to know what the most effective approach is ...
My website heavily relies on JavaScript and incorporates jQuery extensively. I have no plans to make the site functional for users without JavaScript enabled. However, I do want to display a banner at the top of the page indicating that the site is optim ...
Currently, I am in the process of developing a KanBan application using ReactJS. My main goal is to propagate the state from a parent component to the farthest child component in the hierarchy. Within my main App component, there exists a Column component, ...
Here's the code snippet: //Note: x is being pulled from an external source and contains certain values var x = [{ name: 'Michael Lovesllamas Lankford', created: 1338420951.11, laptop: 'pc', laptop_version: null, userid: &apos ...
https://i.sstatic.net/pnu0R.png Is there a way to generate curved text in HTML5, CSS3, or JavaScript similar to the image linked above? I've experimented with transform: rotate(45deg); but that just rotates the text without curving it. Additionally, ...
I have a straightforward form: <form id="change_id" action="update.php?update=profile" method="POST" enctype="multipart/form-data"> <input id="change_username" required name="user_new_name" type="text" placeholder="New Userna ...
I am looking to create conditions using && and || grouping. This means if one group satisfies the condition, the first action will be executed; otherwise, the second action will be taken. I plan to achieve this using if-else statements. Can someone provide ...
Attempted to extract specific data from a JSON file using $routeParams:id. Typically, I would use the following method: var eventId = $routeParams.eventId; $http.get('json/events.json') .success(function(data){ angular.forEach(data,functio ...
I am facing an issue with jquery. I need to change the link to src only when "document.write" is present. Below is my code: myscript.js document.write("TEST ABCD"); test.html <html> <body> <button id="example">click me</button&g ...
In my Vue.js + Nuxt.js component, I have implemented a head() method: <script> export default { name: 'my-page', head() { return { title: `${this.currentPage}` }; }, ... } </script> ...
I am utilizing TypeORM in conjunction with TypeGraphQL. I am curious about the SQL query result that TypeGraphQL provides. For instance, if I have a User Table with numerous columns and a simple resolver like this: @Resolver() class UserResolver { @Q ...
Hey there, I'm struggling with my signup form. I want to submit the form using ajax after completing validation. I've used a jQuery plugin for validation, but whenever I click on any field, the ajax request is automatically sent to the server and ...
Encountering an unusual issue while utilizing lazyload routing in our application! Within AppModule, there is TopModule followed by DashboardModule, all being loaded lazily. When localhost:4200/dashboard is accessed, the loading sequence is AppModule, To ...
I successfully implemented a piece of code into a PHP file by manually searching for the right section and inserting it. Now, I am looking to automate this process with an install script for my code. The ideal installation script would: 1. Copy the exist ...
I have a few pages that I am testing: =========== testpage1.htm =========== <p>This is my first test page</p> <input id="mysearch" type="image" onclick="return searchClick();" src="../../Img/arrow_large_down.gif" /> <span id="generat ...