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C4illin / Add All Subscribed Items to Collection

// ==UserScript==
// @name Add All Subscribed Items to Collection
// @namespace Steam Workshop Add All Subscribed Items to Collection
// @match *://steamcommunity.com/sharedfiles/managecollection/*
// @grant none
// @author      Unknown
// @oujs:author Unknown
// @version     1.0.0
// @license     MIT; https://opensource.org/licenses/MIT
// @copyright   2019, C4illin (https://github.com/C4illin)
// ==/UserScript==

// found this script in a reddit post I think but cant find it now, I made it work as a userscript

var btn_add = document.createElement("BUTTON")
var collection_window = document.querySelector('div.collectionAddItemsSection')
collection_window.insertBefore(btn_add,collection_window.firstChild)
btn_add.setAttribute('id','ASCM_addall')
document.querySelector("button#ASCM_addall").innerHTML = "+"
btn_add.style.position = 'absolute'
btn_add.style.top = '110px'
btn_add.style.right = '50px'
btn_add.style['border-radius'] = '10px'
btn_add.style.color = 'white'
btn_add.style['font-size'] = '40px'
btn_add.style.background = '#00c417'
btn_add.style.width = '60px'
btn_add.style.height = '60px'
btn_add.style['text-decoration'] = 'none'
// Create "Remove" button
var btn_rem = document.createElement("BUTTON")
collection_window.insertBefore(btn_rem ,collection_window.firstChild)
btn_rem .setAttribute('id','ASCM_removeall')
document.querySelector("button#ASCM_removeall").innerHTML = "-"
btn_rem.style.position = 'absolute'
btn_rem.style.top = '110px'
btn_rem.style.right = '120px'
btn_rem.style['border-radius'] = '10px'
btn_rem.style.color = 'white'
btn_rem.style['font-size'] = '40px'
btn_rem.style.background = '#c20000'
btn_rem.style.width = '60px'
btn_rem.style.height = '60px'
btn_rem.style['text-decoration'] = 'none'
// Bind "Add" button
jQuery('button#ASCM_addall').click(function(){
  var collection_name = jQuery('div.manageCollectionHeader div.breadcrumbs a').eq(2).text().trim()
  var url = new URL(document.location.href)
  var collection_id = url.searchParams.get('id')
  jQuery('div#MySubscribedItems div.itemChoice:not(.inCollection)').each(function(){
    var data = {
      id: collection_id,
      sessionid: window.g_sessionID,
      childid: jQuery(this).attr('id').replace('choice_MySubscribedItems_',''),
      activeSection: collection_name
    }
    addToCollection(data, jQuery(this))
  })
})
// Bind "Remove" button
jQuery('button#ASCM_removeall').click(function(){
  jQuery('div#MySubscribedItems div.itemChoice.inCollection').each(function(){
    window.RemoveChildFromCollection(jQuery(this).attr('id').replace('choice_MySubscribedItems_',''))
  })
})
// Function to send a request to add item to a collection
function addToCollection(data, object){
  jQuery.ajax({
    type: "POST",
    url: 'https://steamcommunity.com/sharedfiles/addchild',
    data: data,
    success: function(response){
      if(object && response.success == 1){
        object.addClass('inCollection')
      }
    }
  })
}