If you have a page with an <asp:TextBox TextMode="Password" ... />.
How can you keep the value after a postback?
This is my problem:
At the registration screen of my app you need to enter a password.
Then you click submit, a postback occurs and the password fields are cleared, how can I prevent the password field from clearing?
You require to set it again in page_load or in button click event like this :
string Password = txtPassword.Text;
txtPassword.Attributes.Add("value", Password);
You need to set back the password to the textbox on postback.
txtBox.Attributes["value"] = txtBox.Text;
Best way
dont set input type in aspx page,
set type of input in Pageload in !postback Section
txtPassword.Attributes["type"] = "password";
<input type="password" /> is treated differently than other form controls since it stores sensitive information that is a password of a user. At server side, for every postback the password textbox is force-fully cleared for this reason, should you really need to persist the value in password text-box, set it explicitly as others have mentioned here. But I really don't recommend doing so since it's not a good practice.
I realize this is an old post, but hopefully this will help someone else. I had the same issue on a user setup screen whereby I kept losing the password input during various postbacks. The solution I chose was to place portion of the input screen that posted back into an updatepanel. This solved the problem of the password being blanked out AND didn't present a security risk.
Hope this helps!
Use Jquery to retain your password after postback or submit
$(function () {
$('.txtPassword').val("<%=txtPassword.Value%>");
});
Just add type="password" in asp:textbox and remove Textmode="Password" and no need to write any code in code-behind.
Related
I am having a little problem. Whenever i login and set Remember password option to yes, the next page contains a form and it also includes username and password textboxes. They automatically get filled with the same username and password. Why is this happening? Please Tell me how to solve it
Its browser property. To stop this you can set autocomplete="off" in your inupt type.
<input type="text" name="Username" autocomplete="off">
and AutoCompleteType="disable" when using asp:TextBoxes
You can also put this on the form tag. Note this does not work consistently in all browsers.
Google Chrome and FireFox browsers have a feature that allows users to save user name and passwords to their local machine. This allows them to login the next time without much effort or remembering what that information is. The information is basically auto-filled. When those browsers do this it shows the * in the textbox. Showing that the browser successfully placed the value in the RadTextBox. However, when the c# code behind retrieves the value as an empty string.
My code is as follows
<telerik:RadTextBox ID="txtPassword" runat="server" ToolTip="Enter password"
Text="" MaxLength="40" EnableSingleInputRendering="False"
Wrap="False" TextMode="Password" CausesValidation="false" Skin="WebBlue">
</telerik:RadTextBox>
Code Behind:
objLogin.Password = txtPassword.Text;
Even odder is the fact that if you click the button more than once it will then the code behind will see the actual value and proceed to log you in. It seems that the RadTextBox Control needs to be rendered a second time or post back is required for the control to work properly.
What do I need to do to get the RadTextBox control to recognize the inputed value from the browser initially without having to click multiple times for the code behind to see the value?
Thanks for your help.
That is because your textboxes gets the value on the client side alone, while the underlying RadTextBoxes values do not.
I have experienced this issue before where values set to a RadTextBox by using jQuery xxx.val('...') do not get through to the server-side on postback.
The only way to get the value 'assigned' to the RadTextBox control's Text property from client-side is to use:
$find('<%= txtUsername.ClientID%>').set_value('newvalue');
In your case, most probably the browsers set (autofill) the values and only available on client side. Therefore, what you can do to actually assign those values is to intercept before the Login button postbacks, like so:
var un = $('#<%= txtUsername.ClientID%>').val();
var pw = $('#<%= txtPassword.ClientID%>').val();
$find('<%= txtUsername.ClientID%>').set_value(un);
$find('<%= txtPassword.ClientID%>').set_value(pw);
If you are using RadButton as the Login button, this can be done on the button's OnClientClicking/OnClientClicked event like so:
<telerik:RadButton ID="cmdSignin" runat="server" Text="Sign In"
SingleClick="true" SingleClickText="Signing In..."
OnClientClicking="OnClientClicking"></telerik:RadButton>
Hope that helps.
Is there any secure way of setting value to textbox in password mode?
I have a custom login form with a password textbox:
<asp:TextBox ID="tbPassword" runat="server" TextMode="Password"></asp:TextBox>
and on page load, I'd like to put there some remembered password I've decrypted in code-behind from a cookie.
95% of answers I've found is to set the textbox value, like:
tbPassword.Attributes["value"] = "ThePassword";
However, it's not the most secure way, as it generates following HTML code, visible when view source, where password is stored in a plain text:
<input id="tbPassword" type="password" value="ThePassword" name="ctl00$cpMainContentParent$tbPassword">
I've tried different way with jQuery, setting value with:
$("#tbLogin").val("ThePassword");
It is much better, as the value is not visible in View Source, yet the password is visible in jQuery script on a page...
I've also tried to register client script and run it, but as I cannot "unregister" it, so result is the same as with the plain jQuery sript...
Do you know any workaround to set that value and not show it in source code?
As Bob's comment says, the whole concept is flawed. If the cookie is valid, then just skip the password prompt. If it's not valid, then you have nothing to auto-fill with.
That being said, there is nothing you can do to directly fill the textbox which can't be intercepted in some way. Even if you filled it via a post-load AJAX call, the user could still see the content via something like FireBug. That's inherent in the nature of web browsers - there's nothing that's secure from the browser itself, because the browser needs to understand it to render it.
If you really want to do this, one option is to compute a custom hash of the password which incorporates the timestamp (or some other one-time value), and set the textbox to that. You'd need to accept both the standard password and the hash as valid, but the hash won't be reusable so it won't matter if the user sees it.
Do not set the password in a INPUT element. Instead, set it to a random or fixed value (if you want to indicate a password is set) or empty otherwise. As you say, it means the password is visible in the page source. To handle changing the password, set a flag if the password value so the handling code, either server or client side, knows when the password is modified.
How to disallow use of double quotes " in a textbox
Use String.Contains()
Since you can never control what users do the client you might as well just check it on the server, so you would probably use code something like:
if (textBox1.Text.Contains("\""))
{
Response.Write("Dey aint no way I'm letting you type that!");
}
use RegularExpressionValidator and set the ValidationExpression='^[^\"]*$', that will allow anything, including empty, other than "
If you don't want users to be able to type quotes in the textbox in the first place, consider using a FilteredTextBox from the AJAX Control Toolkit.
Use the RegularExpressionValidator for your page input validation. The .NET validation controls will verify your users' input on both sides, the client-side, and the server-side which is important if the user has disabled JavaScript. This article might also help you to implement the validation of your ASP.NET server controls.
Please don't do this just with JavaScript or AJAX. Always perform a server-side input validation! Especially if you are writing the users' input back into a database (SQL Injections).
You haven't specified if you're using webforms or MVC, so I'm gonna throw a couple things a'cha.
First off, here's the Regex you'll use in either situation. ^[^\"]*$
First for WebForms
<asp:TextBox runat="server" id="TextBox1" />
<asp:RegularExpressionValidator runat="server" id="Regex1" controltovalidate="TextBox1" validationexpression="^[^\"]*$" errormessage="Nope!" />
<!-- This will give you client AND server side validation capabilities-->
To ensure you're valid on the SERVER SIDE, you add this to your form submit method
If Page.IsValid Then
''# submit the form
Else
''# your form was not entered properly.
''# Even if the user disables Javascript, we're gonna catch them here
End If
In MVC you should definitely use DataAnnotations on your ViewModel
NOTE: DataAnnotations can also be use for WebForms if you're planning on doing a lot of repeat ctrl + C and ctrl + V
''# fix SO code coloring
''# this is in the view model
<RegularExpression("^[^\"]*$", ErrorMessage:="Nope")>
Public Property TextBox1 As String ''# don't actually call it TextBox1 of course
And in your controller "Post" action, you wanna add the following
If ModelState.IsValid Then
''# submit the form
Else
''# your form was not entered properly.
''# Even if the user disables Javascript, we're gonna catch them here
End If
i am generate random password and show it in a textbox.
when i am set textbox property textmode to password then it doesn't show in textbox but when i set it singleline then password shows in textbox.
I am using following code --
textbox1.attributes.add("value",passwordvalue);
for show i am using --
textbox1.text = textbox1.attributes["value"].tostring();
Same happing with when i edit record. password doesn't show in textbox.
When you set a textbox in password mode, it renders as an <input type="password" >, which hides what's written in it, but this also forbids setting the value of the field. A password field is strictly for users to type in, you can't pre-fill it with anything.
If you want a textbox that hides the characters, but still allows setting the initial value, you have to build it yourself (or find something that someone else built) using HTML and client script.
Does this help?
HTML
<body>
<input type="text" id="passbox" />
<input type="submit" onclick="generate_password()" value="Generate Password" />
<input type="submit" onclick="toggle_passbox()" value="Toggle Box" />
</body>
JAVASCRIPT
function passbox() {
return document.getElementById('passbox');
}
function generate_password() {
passbox().value=Math.random().toString(16).slice(2);
}
function toggle_passbox() {
passbox().type= passbox().type == "password" ? "text" : "password";
}
You can test this at http://jsbin.com/uxano3
textbox1.text = "yourrandompassword"
i dont get what you are trying to do with the attributes.
Are you using a asp control element for the textbox?
if you are generating a random password, i guess you want to show it to your user, not hide is with the asterix'es?
That approach doesn't make sense since even if it showed it would be just *****, and then that leaves the user in the same situation. The password field just isn't meant to be showed.
If you must keep with the generate random password, you could:
Show some simple text above the password field, something like: "Please enter your password in the field below. Alternatively leave it blank, and use this password we have generated for you: SomeNicePassword"
About the edit scenario, you shouldn't have passwords in clear, its just not safe and could upset some customers. Besides, an edit password feature usually requires the user to enter their current password and the new one in separate fields, to make sure it wasn't that it wasn't that the user left the session open and someone else is trying to take over the account.
If you want to use Vb.net you will have to use the following code for creating textbox as password
textbox1.passwordchar="*"
If you want to use C Sharp you will have to use the following code for creating textbox as password
textbox1.passwordchar='*';
If you want to use C++ you will have to use the following code for creating textbox as password
textbox->passwordchar='*';