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Posts tagged with: javascript

A potentially dangerous Request.Form value was detected from the client

Have you ever experience the following error in ASP .NET?

A potentially dangerous Request.Form value was detected from the client 

Then you are one like me. Then you should now that one of the values of your elements (<inputs> or <button> or <textarea>) has html elements on it. Example is bellow:

<input type=’text’ name=’content’ value='<script language=”javascript”>alert(“Hello World!”);</script>’/>

Then you should also know that this error is persisting because the values given above might be an XSS attack. If you are sure that you want to accept this type of values on your dabatase you may explicitly remove this validation by adding this tag to your page’s masterpage or 1st line of tag.

validateRequest=”false”

If you are on ASP .NET MVC you can add this to your model, assuming that your model has the content variable.

[AllowHtml]
public string content = String.Empty;

Thanks hope it help you allot. Also if you are not familiar with XSS attacks, I will try to make an article for that so you can create your own script that is hack-able, be able to prevent it, and know what are it’s crons.

God Bless!


jStorage:An alternative for Cookies

Have you ever wondered if there is an alternative for Cookies? 

You should, because there are limitation and downsides in using Cookies on your website that massively use this feature.

  1. Cookies has limited size on most browsers
  2. Cookies is transfer to server every page load
  3. If you overload the size of the Cookies it will also eat up the space of session and might remove it

Introducing jStorage, a jQuery way of saving your data to the local client and I quote

jStorage is a cross-browser key-value store database to store data locally in the browser – jStorage supports all major browsers, both in desktop (yes – even Internet Explorer 6) and in mobile.

Yes it even support IE 6!

So how to use it in an easy way?

  1. Include the following references to your project
    1. <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.8.0/jquery.min.js"></script>
      <script src="https://raw.github.com/andris9/jStorage/master/jstorage.js"></script>
  2. Use $.jStorage.set(key, value) to save a value 
  3. Use $.jStorage.get(key, “default value”) to get a value

And thats it you are now using jStorage. 

Reference : http://www.jstorage.info/


Get the User Referrer via JavaScript

Hi,

You van get the user referrer via javascript using the following code:

document.referrer

The said code will give you the full url path to which your user came from.

Example is http://google.com/?some-strings=goes-here

So you can check if its from a user from a google with a particular search string.

 

Just a Note. It can also received the same domain to which your site is in. For an instance your domain is http://domain.com then you referesh the page, the said code will return http://domain.com because you just refresh the page.