Call function in content script from web page

[Michal Drwal]

Hi
How can i call function defined in content script from my web page?

in content script i have UruchomWybierzPlik()

function UruchomWybierzPlik(){
 //if (e.shiftKey && e.ctrlKey && e.keyCode == trigger_key)
 {
  alert("Contentscript is sending a message to background script: '" + contentScriptMessage  + "'");
 // chrome.extension.sendRequest({Function: "WybierzPlik"});
 chrome.runtime.sendMessage({Function: "WybierzPlik"}, function(response) {
  //console.log(response.farewell);
});
 
 }
}

in my wab page i have

function WybierzPlikChrome(callBackRez)
{
   
   UruchomWybierzPlik();
  
}

UruchomWybierzPlik() is not defined

how call UruchomWybierzPlik(); from WybierzPlikChrome()  ???

[PhistucK]

​You cannot call content scripts functions directly from web page scripts. They live in a different, separate world for increased security.

You have a few options -

- Add them as listeners to custom events (window.addEventListener('​UruchomWybierzPlik", UruchomWybierzPlik)) in the content script and dispatch the event from the web page script (window.dispatchEvent(new Event('UruchomWybierzPlik'))). If you want to return a value, you could use the same way, but the other way around (dispatch the event from the content script, listen to the event from the web page script), or put the value in the DOM somewhere (using element.textContent or using element.setAttribute).

- Inject a <script> to the page. That script will run in the context and world of the page and could interact with the other web page scripts normally.

☆PhistucK

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[Michal Drwal]

Hi

Now i try call function by events.

In my web page is:

function WybierzPlik()
{
        window.postMessage({ type: "ELDOK_EXT_MSG", params: "UruchomWybierzPlik()" }, "*");
}

in my content script :

window.addEventListener("message", function(e) {
       
        alert('aaaa');
       
        if (e.source != window) {
            return;
        }

        var data = JSON.parse(e.data);
        if (data.type && (data.type == "ELDOK_EXT_MSG")) {
              UruchomWybierzPlik();
       
        }
    });

My manifest :
{
  "name": "Plugin el-Dok",
  "description": "Plugin el-Dok",
  "version": "0.7",
 
  "background": { "scripts": ["background.js"], "persistent": false },
 
   "content_scripts":[{
       "matches": [ "*://*/*" ],
       "js": [ "jquery-2.1.4.min.js", "content.js" ],
      "run_at": "document_idle"
    }],
    "content_security_policy": "script-src 'self'; object-src 'self'",
     "description": "Komponenty dla el-Dok System ",

  "manifest_version": 2,
  "permissions": [ "nativeMessaging","tabs" ,"activeTab", "management" ],
  "externally_connectable": {
   "matches": ["*://*.eldok.pl/*","*://localhost/*"  ]
  
 
}
 
}

But addEventListener don't start. Where is the problem?

[PhistucK]

This simple test code works for me (using the debugger) -

Content script -

window.addEventListener('message', function () {console.log('0')});

Web page script -

window.postMessage({type: 'f', params: 'd()'}, "*");

0 is printed.

Make sure you operate in the same frame (or define all_frames: true in your manifest).

☆PhistucK

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