javascript - Chrome Extension only hitting my main.js upon page reload -


i creating chrome extension trello which, @ basic start, adds button top of trello header.

i following code: 

manifest.json {     "name": "trello item linker",     "version": "1",     "manifest_version" : 2,     "description": "creates links every item number referenced in trello card.",     "background" : {         "page" : "background.html",          "persistent": false     },     "page_action" :     {         "default_icon": {             "19": "icons/19.png",             "38": "icons/38.png"         }     },     "content_scripts": [         {             "matches": ["https://trello.com/b/*"],             "js": [                 "lib/jquery-2.1.1.min.js",                 "scripts/main.js"             ],             "run_at": "document_idle"         }     ],     "permissions": [         "tabs"     ],     "icons": {         "16": "icons/16.png",         "48": "icons/48.png",         "128": "icons/128.png"     },     "web_accessible_resources": [         "settings/index.html"     ],     "options_page": "settings/index.html" }

in main.js script, have following snippet:

chrome.extension.sendmessage({}, function (response) {         var readystatecheckinterval = setinterval(function () {             if (document.readystate === "complete") {                 console.log(">document ready");                 clearinterval(readystatecheckinterval);              if($(".header-user").html().includes("create item links")){                 console.log(">header contains item option");             }                else{                 $(".header-user").append('<a class="header-btn js-linkscrs" href="#">link scrs</a>');                 console.log(">create item links added header");             }                    clearinterval(readystatecheckinterval);         }         else{             console.log("document not ready");         }          $(".js-linkscrs").click(function(e){             linkitems(event);         });      }, 10); });  /**

whenever navigate trello.com/b/* page (by using trello board links), document.readystate never being set complete. therefore, button not being inserted. when refresh entire page, document.readystate set complete, , rest of code fires expected. missing?

this first chrome extension hoping learning experience me first , foremost.

thanks!


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