Determine the class of the <body> element through the use of AJAX

I'm currently working with this AJAX code snippet:

function ajax(){
    if (!navigator.standalone) return;
for (var i= document.links.length; i-->0;) {
document.links[i].onclick= function() {
if(this.getAttribute("class") == "noeffect") return;
var req= new XMLHttpRequest();
req.onreadystatechange= function() { 
    if (this.readyState!==4) return;
        document.body.innerHTML= this.responseText;
    ajax();
};
req.open('GET', this.href, true);
req.send();  
return false;
};}
}

window.onload= function() {
    window.scrollTo(0, 0.9);
ajax();

};

In my setup, I've assigned specific classes to the <body> on certain pages. Only those classes are excluded when retrieving content. Is there a method to fetch the ENTIRE body using AJAX? Or perhaps even the complete HTML including the <head> section.

Your assistance is greatly appreciated :)

Answer №1

One of the main issues here stems from how innerHTML works, as it places HTML within an element rather than replacing it entirely. This can result in nested body elements, which is not valid.

Using replaceChild instead of innerHTML would be a solution, but it's not possible without a body node. Additionally, replacing a body element may not even work in Internet Explorer.

Even utilizing responseXML won't solve the problem, as moving nodes between different documents is not supported in IE.

In summary:
To resolve this issue, you need to parse the response, extract the body content and class, then update the existing body's innerHTML and class accordingly.

Here's a brief example (adjust the RegExp as needed based on the response):

var parsed = this.responseText.match(/<body\s+class="([^"]*)">(.*)<\/body>/);
   document.body.className = parsed[1];
   document.body.innerHTML = parsed[2];

Answer №2

It is advisable to utilize responseXML instead for better performance.

Modify as needed.

Your current code contains errors. Make sure to verify if req.readyState==4 and req.status==200, then proceed by calling req.responseTxt:

req.onreadystatechange = function() {
  if (this.readyState==4 && this.status==200) {
    document.body.innerHTML= this.responseText;
    ajax();
  }
};

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