ReCaptcha: connecting to the TextBox's OnKeyDown event using script

Question

ReCaptcha: connecting to the TextBox's OnKeyDown event using script

I've been figuring out how to integrate ReCaptcha, ASP.NET, and Gaia Ajax. It was a bit of a challenge to use the ReCaptcha AJAX APIs with Gaia to fetch the data from the recaptcha_response_field text box in an AJAX postback through a patch.

This was just a brief overview. Now, I want to apply another patch to ReCaptcha without having to start from scratch (an extensive open source library that enhances the current ASP.NET implementation would be ideal, but unfortunately I don't have the time for that): check out this question for more details.

Essentially,

After using ReCaptcha.Create() to display the CAPTCHA in an AJAX postback, I need to attach to the OnKeyDown event of the recaptcha_response_field and insert a JavaScript snippet that prevents the form from being submitted.

Since I can't control the rendering of the <input> tag, I have to handle it externally.

In essence,

I believe you could perhaps address the broader question: "how can JavaScript event handlers be set programmatically?" as this concept is applicable to various event classes.

Many thanks

javascript asp.net ajax

Answer 1

Answer №1

In my opinion, it's not advisable to perform real-time captcha checks as this could potentially leave the system vulnerable to brute force attacks. It's always better to implement additional security measures.

Personally, I prefer using jQuery for handling events. An example of this would be:

$(function() 
{
  $("#{TEXTBOXID}").keydown(function(event)
  {
    alert(event.keyCode);
  });
});

(excerpted from Why does JQuery keydown work for window but not textbox?)

Answer 2

In my opinion, it's not advisable to perform real-time captcha checks as this could potentially leave the system vulnerable to brute force attacks. It's always better to implement additional security measures.

Personally, I prefer using jQuery for handling events. An example of this would be:

$(function() 
{
  $("#{TEXTBOXID}").keydown(function(event)
  {
    alert(event.keyCode);
  });
});

(excerpted from Why does JQuery keydown work for window but not textbox?)

ReCaptcha: connecting to the TextBox's OnKeyDown event using script

Essentially,

In essence,

Answer №1

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