Add an input search to filter comments from Hacker News
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
/*Copy this code to the console in HN and it will show a Search filter that you can use to filter the posts from HN*/ | |
function query() { | |
var | |
// HN is done with very unsemantic classes. | |
job_list = Array.prototype.slice.call(document.querySelectorAll('.c5a,.cae,.c00,.c9c,.cdd,.c73,.c88')), | |
query_list = Array.prototype.slice.call(arguments), | |
shown = 0, total = job_list.length; | |
// Traverses up the dom stack trying to find a match of a specific class | |
function up_to(node, klass) { | |
if (node.classList.contains(klass)) { | |
return node; | |
} | |
if(node === document.body) { | |
throw new Exception(); | |
} | |
return up_to(node.parentNode, klass); | |
} | |
function display(node, what) { | |
up_to(node, 'athing').style.display = what; | |
} | |
// If we have a RegEx, return it | |
// Otherwise make it a case insensitive regex. | |
function destring(what) { | |
return what.test ? what : new RegExp(what.toString(), 'i'); | |
} | |
// Hide all the postings | |
job_list.forEach(function(node) { | |
display(node, 'none'); | |
}); | |
query_list.forEach(function(query) { | |
if (query.forEach) { | |
var and_query_list = query.map(destring); | |
job_list.forEach(function(node) { | |
var | |
doesMatch = true, | |
toTest = node.innerHTML; | |
and_query_list.forEach(function(query) { | |
doesMatch &= toTest.search(query) > -1; | |
}) | |
if(doesMatch) { | |
display(node, 'block'); | |
shown ++; | |
} | |
}); | |
} else { | |
query = destring(query); | |
job_list.forEach(function(node) { | |
if(node.innerHTML.search(query) > -1) { | |
display(node, 'block'); | |
shown ++; | |
} | |
}); | |
} | |
}); | |
return {shown: shown, total: total} | |
} | |
var searcher = document.createElement("input"); | |
searcher.type = 'text'; | |
searcher.style.position = "absolute"; | |
searcher.style.top = "10px"; | |
searcher.style.left = "50%"; | |
searcher.style.width = "20%"; | |
searcher.setAttribute('onkeyup','query(this.value)'); | |
document.body.appendChild(searcher); |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment