Ways to secure the formdata message when sending it through the submit action

Question

Ways to secure the formdata message when sending it through the submit action

I have a unique script that modifies the behavior of submit buttons on social networking sites, such as Facebook. The script sets an "onclick" attribute that triggers a specific function when a user clicks on a submit button. This function is designed to encrypt messages that users send through these platforms.

The idea is to intercept the click event, prevent the default action from happening, extract the message being sent (possibly using formData), encrypt the text, and then allow the submit action to proceed with the encrypted message.

Below is a simplified version of the script:

$('textarea', window.content.document)
.closest('form')
.find('input[type=submit]')
.attr("onclick","encryptMessage();");

function encryptMessage(){
// Logic to access formData, encrypt the message, and continue submit action
};

javascript forms greasemonkey jquery-events userscripts

Answer 1

Answer №1

It appears that a crucial return statement is missing in your code snippet. Without the return keyword before the function call in the onclick attribute, the action may proceed regardless of the function's outcome.

$('textarea', window.content.document)
.closest('form')
.find('input[type=submit]')
.attr("onclick","return validate();");

function validate(){
//Retrieve form data and encrypt the message before submission
//Remember to explicitly return true or false to control the submission
};

Answer 2

It appears that a crucial return statement is missing in your code snippet. Without the return keyword before the function call in the onclick attribute, the action may proceed regardless of the function's outcome.

$('textarea', window.content.document)
.closest('form')
.find('input[type=submit]')
.attr("onclick","return validate();");

function validate(){
//Retrieve form data and encrypt the message before submission
//Remember to explicitly return true or false to control the submission
};

Answer 3

Answer №2

To avoid adding an onclick function to the submit buttons, you can directly incorporate a call to the function that collects and encrypts data within the form itself, as demonstrated below:

<form name="sampleForm" method="post" onsubmit="return dont()" enctype="multipart/form-data" action="someurl">


function dont()
{
    //code to access the form data and encrypt

    if(error)
       return false;  //Prevents form submission
    else
      return true;

}

Alternatively,

You can use a button (input type=button) instead of a submit button (input type=submit) and define the onclick function like this:

<input type="button" value="submit" onclick="dont()" />

function dont()
{
    //code to access the form data and encrypt

    if(error)
       alert("Failed")  //Stops the submission of the form
    else
      document.forms[0].submit();

}

I hope this explanation is helpful.

Answer 4

To avoid adding an onclick function to the submit buttons, you can directly incorporate a call to the function that collects and encrypts data within the form itself, as demonstrated below:

<form name="sampleForm" method="post" onsubmit="return dont()" enctype="multipart/form-data" action="someurl">


function dont()
{
    //code to access the form data and encrypt

    if(error)
       return false;  //Prevents form submission
    else
      return true;

}

Alternatively,

You can use a button (input type=button) instead of a submit button (input type=submit) and define the onclick function like this:

<input type="button" value="submit" onclick="dont()" />

function dont()
{
    //code to access the form data and encrypt

    if(error)
       alert("Failed")  //Stops the submission of the form
    else
      document.forms[0].submit();

}

I hope this explanation is helpful.

Ways to secure the formdata message when sending it through the submit action

Answer №1

Answer №2

Similar questions

Preventing attribute or tag cloning in Jquery: What you need to know

Retrieve information from a variety of selected checkboxes

Easily retrieve the value of a form control when it is changed with Form

Experiencing a problem with the bundle.js file in Angular Universal

Why is AJAX failing to execute PHP file from JavaScript?

PHP Server with MySQL Form Builder

The scrollOverflow feature in fullPage.js is not properly detecting the height of dynamically generated content

Countdown component in Ant Design failing to display correct date

Uploading multiple images using AngularJS and Spring framework

How come the instanceof operator returns false for a class when its constructor is present in its prototype chain?

What is the method for ensuring text remains within a square while it is being relocated?

How to Implement Flexbox Display Across Various Browsers Using jQuery?

Error encountered while updating in the midst of an ongoing state transition, e.g. within the `render` method

Organize the array by property name and include a tally for each group

Is there a way to activate a click event on a particular child element within a parent element?

Angular @Input set function not being activated during unit testing

Executing JavaScript code within a class object using ASP-VB

Modify hyperlink address according to chosen option

React Material UI unselect

What is the process for performing the "extract function" refactoring in JavaScript?