Search result filter for duckduckgo.com

ddg_filter.js

function inject_filter(
  blacklist,
  scroll_threshold = 512
)
{
  let lastscroll = 0;
  
  function err(msg)
  {
    document.onscroll = null;
    alert("Error:\n" + msg);
  }
  
  function update(first_pass)
  {
    try
    {
      let e = document.querySelector("div.results");
    	if(e === null || e === undefined) return;
      
      let results = e.querySelectorAll("div.result");
      if(results.length <= 0) return;
      
      let delete_these = [ ];
      let count = blacklist.length;
      results.forEach((n) => {
        if(n.hasAttribute("ignore")) return;
        
        let e = n.querySelector("span.result__url__domain");
        if(e == null) return;
        let domain = e.innerHTML;
        
        //e = n.querySelector("span.result__url__full");
        //if(e == null) return;
        //let url = e.innerHTML;
        
        let str = domain; // search only domain name for now
        
        for(let i = 0; i < count; i++)
        {
          if(str.search(blacklist[i]) != -1)
          {
            delete_these.push(n);
            break;
          }
        }
      });
			
      count = delete_these.length;
      if(count <= 0) return;
      
      let insert_info = delete_these[0].previousSibling;
      let restore = document.createElement("div");
      restore.style["margin-top"] = "10px";
      restore.style["padding-left"] = "8px";
      restore.style["padding-right"] = "8px";
      
      for(let i = 0; i < count; i++)
      {
        let e = delete_these[i];
        e.setAttribute("ignore", "true");
        restore.appendChild(e);
      }
      
      let info = document.createElement("div");
      info.style["padding-left"] = "3px";
      info.style["color"] = "#d7b973";
      info.style["background"] = "#dd631044";
      info.style["border"] = "1px solid #a6691b55";
      info.style["border-radius"] = "4px";
      info.style["cursor"] = "pointer";
      info.setAttribute("title", "click to restore");
      
      info.onclick = () => {
        try
        {
          info.onclick = null;
          info.style["cursor"] = null;
          info.appendChild(restore);
        }
        catch (e)
        {
          err(e);
          return;
        }
      };
      
      if(first_pass)
      {
        info.innerHTML = "<span style=\"opacity: 0.8\">⚠️</span> removed " + count + " search results";
      	
      	let el = document.querySelector("div.results--main");
     	 	el.insertBefore(info, el.children[1]);
      }
      else
      {
        info.style["margin-bottom"] = "16px";
        info.innerHTML = "<span style=\"opacity: 0.8\">⚠️</span> removed " + count + " more search results";
        
     	 	insert_info.parentElement.insertBefore(info, insert_info.nextSibling);
      }
    }
    catch (ex)
    {
      err(ex);
  	}
  }
  
  function scroll()
  {
    let currscroll = document.documentElement.scrollTop;
    
    if(Math.abs(lastscroll - currscroll) > scroll_threshold)
    {
      lastscroll = currscroll;
      update(false);
    }
  }
  
  function main()
  {
    update(true);
    
    if(scroll_threshold > 0)
    	document.onscroll = scroll;
  }

  window.onload = main;
}

can be used as a greasemonkey userscript like this:

// ==UserScript==
// @name     duckduckgo filter
// @version  1
// @grant    none
// @require  https://gist.githubusercontent.com/CptPotato/6233d3ded9deaaf342f4bcbdc9817a50/raw/ddg_filter.js
// ==/UserScript==

(function(){
  const junk = [
    "listverse.com",
    "techradar.com",
    "medium.com",
    "techviral.net",
    "lifewire.com",
    "zapier.com",
    "digitaltrends.com",
    "makeuseof.com",
    "windowscentral.com",
    "listoffreeware.com",
    "fossbytes.com",
    "accuratereviews.com",
    "allthatsaas.com",
    "gearhungry.com",
    "ecloudbuzz.com",
    "cnet.com",
    "pcmag.com",
    "bestproducts.com",
    "tomsguide.com",
    "rollingstone.com",
    "bestreviews.com",
    "bestadvisor.com",
    "thetechlounge.com",
    "verywellfit.com",
    "10bestportable.com",
    "pcsuggest.com",
    "wired.co.uk",
    "alltopstuffs.com",
    "alltoptenbest.com",
    "consumerhelp.guide",
    "xbitlabs.com",
    "ign.com",
    "guru99.com",
    "techwiser.com"
  ];
  
  inject_filter(junk);
})();