Steps for modifying a method within a DOM objects prototype

Question

Steps for modifying a method within a DOM objects prototype

I'm looking to modify the open() method in XMLHttpRequest objects. Specifically, I need to alter the URL for every request sent through xhr. Is there a way to accomplish this?

For instance, when an xhr object opens a request for http://domain.com/, I want to change it to https://domain.com/.

javascript prototype-programming

Answer 1

Answer №1

It is possible to interrupt any method on native DOM objects, however, it is not recommended. It's best to avoid doing this.

If you're interested in manipulating the XMLXttpRequest's open method, here is a way to do it:

var open = XMLHttpRequest.prototype.open;
XMLHttpRequest.prototype.open = function(){ 
   // Perform desired actions 
   // For example, log to console:
   console.log('test');
   // Then allow the open method to proceed
   open.apply(this, arguments);
}

If your specific use case involves changing the protocol of a URL, you can achieve this as follows:

var open = XMLHttpRequest.prototype.open;
XMLHttpRequest.prototype.open = function(){ 
   var link = document.createElement('a'); // Create an anchor element
   link.href = arguments[1]; // Set its href to the second argument (the URL)
   link.protocol = 'https:'; // Force HTTPS protocol for the link
   arguments[1] = link.href; // Update the URL to start with 'https'
   // Then allow the open method to proceed
   open.apply(this, arguments);
}

Answer 2

It is possible to interrupt any method on native DOM objects, however, it is not recommended. It's best to avoid doing this.

If you're interested in manipulating the XMLXttpRequest's open method, here is a way to do it:

var open = XMLHttpRequest.prototype.open;
XMLHttpRequest.prototype.open = function(){ 
   // Perform desired actions 
   // For example, log to console:
   console.log('test');
   // Then allow the open method to proceed
   open.apply(this, arguments);
}

If your specific use case involves changing the protocol of a URL, you can achieve this as follows:

var open = XMLHttpRequest.prototype.open;
XMLHttpRequest.prototype.open = function(){ 
   var link = document.createElement('a'); // Create an anchor element
   link.href = arguments[1]; // Set its href to the second argument (the URL)
   link.protocol = 'https:'; // Force HTTPS protocol for the link
   arguments[1] = link.href; // Update the URL to start with 'https'
   // Then allow the open method to proceed
   open.apply(this, arguments);
}

Steps for modifying a method within a DOM objects prototype

Answer №1

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