Access localStorage from a content script

[Jared]

I have an extension in which I need to access the web page's localStorage. I have a content script and was under the impression that that could be done. I have been unable to accomplish this. Any help would be great.

Here is some of the code

Manifest.json

"name": "Promotify",

  "version": "1.0",

  "manifest_version": 2,

  "description": "Creates a user story from an issue using its description to create sub-tasks",

  "icons": {"20": "promotify_20.png",

            "128": "promotify_128.png"},

  "background": {

    "scripts": ["background.js"],

    "persistent": false

    

  },

  

  "content_scripts": [

    {   

      "matches": ["http://domain/project/*"],

      "js": ["user_story_template.js"]

    }   

  ],

  "page_action": {

    "default_title": "Promotify",

    "default_icon": "promotify_20.png",

    "default_popup": "popup.html" 

  },

  "permissions":["tabs",

                 "http://domain/project/*",

                 "declarativeContent",

                 "storage",

                 "webNavigation"

                 ]

 

Snippet of content script:

var token = ""

chrome.storage.local.get('token', function(result){

    token = result.token;

    });

[Vikas Singh]

store ur url like this...............................................

function webstorage(url)

{   

       if(typeof(Storage)!== 'undefined')

    {       

      if(localStorage.getItem("global_counter") == null)  

      {

        localStorage.setItem("global_counter", 7);

      }

      var global_value = Number(localStorage.getItem("global_counter"));

     

      if(localStorage.getItem("url:"+date.getDate()+":0") == null)

      {  

        localStorage.setItem("localname"+global_value,(date.getDate()*100)+(date.getMonth()+1));

        localStorage.setItem(":"+global_value+"_Counts",1);

        localStorage.setItem("url:"+date.getDate()+":0" ,url);

        global_value = global_value - 1;

        localStorage.setItem("global_counter",global_value);        

      }

      else

      { var counts = Number(localStorage.getItem(":"+(global_value+1)+"_Counts"));

        localStorage.setItem("url:"+date.getDate()+":"+counts,url);

        localStorage.setItem(":"+(global_value+1)+"_Counts", counts+1);

      }

      if(localStorage.getItem("global_counter") == 0)

      { localStorage.setItem("global_counter",1);

        removeContent();  

        }

    }

    else

    {

      document.getElementById("xyz").innerHTML = "Sorry your browser does not support HTML5 web storage";

    }

}

and fetchdata from url like this............................................

function fetchHistory()

{ 

  

  var globalCount = 7-Number(localStorage.getItem("global_counter"));

  var months = ['january','february','march','april','may','june','july','august','september','october','november','december'];

   for(m=0;m<globalCount;m++)

  { 

      var datestamp = Number(localStorage.getItem("localname:"+(7-m)));

    var Cdate =  parseInt(datestamp/100); 

    var Cmonth = datestamp - (Cdate*100); 

    var count = Number(localStorage.getItem(":"+(7-m)+"_Counts"));

    for(j=1;j<13;j++)

    {

      if(Cmonth == j)

        { var month = months[j-1]; }

    }

     for(k=0;k<count;k++)

    {

      var his = localStorage.getItem('url:'+Cdate+":"+k);

if(his!=null && his.indexOf('https://www.youtube.com/watch?v=') == 0){

var equalPos = his.indexOf("=");

     

}

}

    document.getElementById('xyx).innerHTML = data;

}

[Jared]

I have tried to use HTML5 webstorage without success. The content script doesn't seem to have access to the site's localStorage.

[Antony Sargent]

See the documentation on isolated worlds: https://developer.chrome.com/extensions/content_scripts#execution-environment

The typical workaround if you need to access something in the context of the page itself is to inject a <script> tag into the DOM, possibly using something like postMessage to communicate back to your content script. 

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