javascript - Calling a function in chrome.tabs.executeScript - Stack Overflow

I want to call a function in the chrome.tabs.executeScript that returns a string that I will be sending it in chrome.runtime.sendMessage().

code:

chrome.tabs.executeScript(tab.id, {code:var string1= ??? ;
chrome.runtime.sendMessage(string1);"});

How do I do this . My function contains Javascript code that returns a string or an array of strings.

Some help would be appreciated.

Update:

function(array_of_Tabs) {
  var tab = array_of_Tabs[0];
  //tab.url; - url of the active tab

  chrome.tabs.executeScript(tab.id, {code: 'var test = document.body,text= test.textContent,bodyStart="<BODY",bodyEnd="</BODY>",regex=bodyStart+"(.*?)"+ bodyEnd,regexg = new RegExp(regex, "g"),match = regexg.exec(text);' + 'chrome.runtime.sendMessage(match);'});
});
chrome.runtime.onMessage.addListener(function(request) {
  document.getElementsByTagName('html')[0].innerHTML = request;
});

This should've worked according to what you told me, But doesn't . Why.?

And yes BTW I am not parsing pure html on the page it may be anything say to for that matter.

I want to call a function in the chrome.tabs.executeScript that returns a string that I will be sending it in chrome.runtime.sendMessage().

code:

chrome.tabs.executeScript(tab.id, {code:var string1= ??? ;
chrome.runtime.sendMessage(string1);"});

How do I do this . My function contains Javascript code that returns a string or an array of strings.

Some help would be appreciated.

Update:

function(array_of_Tabs) {
  var tab = array_of_Tabs[0];
  //tab.url; - url of the active tab

  chrome.tabs.executeScript(tab.id, {code: 'var test = document.body,text= test.textContent,bodyStart="<BODY",bodyEnd="</BODY>",regex=bodyStart+"(.*?)"+ bodyEnd,regexg = new RegExp(regex, "g"),match = regexg.exec(text);' + 'chrome.runtime.sendMessage(match);'});
});
chrome.runtime.onMessage.addListener(function(request) {
  document.getElementsByTagName('html')[0].innerHTML = request;
});

This should've worked according to what you told me, But doesn't . Why.?

And yes BTW I am not parsing pure html on the page it may be anything say to for that matter.

• javascript
• google-chrome
• google-chrome-extension

Share Improve this question Follow edited Nov 30, 2013 at 14:52 rahul888 asked Nov 30, 2013 at 10:37 rahul888rahul888 41322 gold badges99 silver badges1818 bronze badges 1

• See my ment in your other identical question. – gkalpak Commented Nov 30, 2013 at 16:56

Add a ment  | 

1 Answer 1

Sorted by: Reset to default 3

chrome.tabs.executeScript has a third, optional argument that has access to the result of your injected code. E.g.

// In `background.js`:
...
const tab = ...
chrome.tabs.executeScript(
    tab.id,
    {code: 'const string1 = "Hello, world!"; return string1;'},
    resultArr => processString1(resultArr[0]));

function processString1(str1) {
  alert(`String1 = "${str1}"`);
}

If this does not cover your needs and you still want to use Message Passing:

// In `background.js`:
...
const tab = ...
chrome.tabs.executeScript(
    tab.id,
    {
      code: 'const string1 = "Hello, world!"; ' +
            'chrome.runtime.sendMessage({text: string1});',
    });

chrome.runtime.onMessage.addListener(msg => {
  if (msg.text !== undefined) {
    alert(`String1 = "${msg.text}"`);
  }
});