admin管理员组

文章数量:1134243

I would like to put a button in my app, if you press it it will get the contents of everything that was written to the console and email it to me (for reporting bugs). I know I can keep a variable around and every time I do a console.log also append the message to that variable but I am trying to keep the memory consumption of the app low so it would be much more efficient just to grab it from the console.

Is there a way to retrieve the console messages from javascript?

I would like to put a button in my app, if you press it it will get the contents of everything that was written to the console and email it to me (for reporting bugs). I know I can keep a variable around and every time I do a console.log also append the message to that variable but I am trying to keep the memory consumption of the app low so it would be much more efficient just to grab it from the console.

Is there a way to retrieve the console messages from javascript?

  • javascript
  • google-chrome
Share Improve this question edited Apr 17, 2021 at 11:30 phrogg 9081 gold badge13 silver badges28 bronze badges asked Nov 7, 2013 at 20:31 MikeMike 1,4732 gold badges10 silver badges7 bronze badges 4
  • 1 possible duplicate of Google chrome extension : is it possible to get console output (js errors, console.log or etc) – DontVoteMeDown Commented Nov 7, 2013 at 20:33
  • thanks, that is what I was thinking. I did some searching and didn't see this post, thanks for pointing it out – Mike Commented Nov 7, 2013 at 20:39
  • 1 thanks, I used jsconsole.com before for remote debugging, next time I ned it I will give your library a look – Mike Commented Nov 7, 2013 at 21:06
  • @Mike Another fine tool is weinre. I used both weinre and jsconsole and I liked weinre most. – DontVoteMeDown Commented Nov 8, 2013 at 9:45
Add a comment  | 

6 Answers 6

Reset to default 149

You can't. What's in the console can't be read from JavaScript.

What you can do is hook the console.log function so that you store when it logs :

console.stdlog = console.log.bind(console);
console.logs = [];
console.log = function(){
    console.logs.push(Array.from(arguments));
    console.stdlog.apply(console, arguments);
}

console.logs contains all what was logged. You can clean it at any time by doing console.logs.length = 0;.

You can still do a standard, non storing, log by calling console.stdlog.

get all console data

how to read browser console error in js?

How to read from Chrome's console in JavaScript

https://www.quora.com/How-do-I-read-console-window-errors-from-Chrome-using-JavaScript

logs

console.defaultLog = console.log.bind(console);
console.logs = [];
console.log = function(){
    // default &  console.log()
    console.defaultLog.apply(console, arguments);
    // new & array data
    console.logs.push(Array.from(arguments));
}

error

console.defaultError = console.error.bind(console);
console.errors = [];
console.error = function(){
    // default &  console.error()
    console.defaultError.apply(console, arguments);
    // new & array data
    console.errors.push(Array.from(arguments));
}

warn

console.defaultWarn = console.warn.bind(console);
console.warns = [];
console.warn = function(){
    // default &  console.warn()
    console.defaultWarn.apply(console, arguments);
    // new & array data
    console.warns.push(Array.from(arguments));
}

debug

console.defaultDebug = console.debug.bind(console);
console.debugs = [];
console.debug = function(){
    // default &  console.debug()
    console.defaultDebug.apply(console, arguments);
    // new & array data
    console.debugs.push(Array.from(arguments));
}

I have used this code in the past to capture all console activity and store it with types and timestamps in console.everything for sending back to the server for diagnosing form data entry issues. I run this code as early as possible in the <head> element.

if (console.everything === undefined)
{
    console.everything = [];

    console.defaultLog = console.log.bind(console);
    console.log = function(){
        console.everything.push({"type":"log", "datetime":Date().toLocaleString(), "value":Array.from(arguments)});
        console.defaultLog.apply(console, arguments);
    }
    console.defaultError = console.error.bind(console);
    console.error = function(){
        console.everything.push({"type":"error", "datetime":Date().toLocaleString(), "value":Array.from(arguments)});
        console.defaultError.apply(console, arguments);
    }
    console.defaultWarn = console.warn.bind(console);
    console.warn = function(){
        console.everything.push({"type":"warn", "datetime":Date().toLocaleString(), "value":Array.from(arguments)});
        console.defaultWarn.apply(console, arguments);
    }
    console.defaultDebug = console.debug.bind(console);
    console.debug = function(){
        console.everything.push({"type":"debug", "datetime":Date().toLocaleString(), "value":Array.from(arguments)});
        console.defaultDebug.apply(console, arguments);
    }
}

QA Collective's solution is very nice but has a lot of repeated code and doesn't capture errors that are not printed via the console.log, console.error, etc.

Here's the DRY and extended version of his solution that captures more error messages that show up in the console:

if (console.everything === undefined) {
  console.everything = [];
  function TS(){
    return (new Date).toLocaleString("sv", { timeZone: 'UTC' }) + "Z"
  }
  window.onerror = function (error, url, line) {
    console.everything.push({
      type: "exception",
      timeStamp: TS(),
      value: { error, url, line }
    })
    return false;
  }
  window.onunhandledrejection = function (e) {
    console.everything.push({
      type: "promiseRejection",
      timeStamp: TS(),
      value: e.reason
    })
  } 

  function hookLogType(logType) {
    const original= console[logType].bind(console)
    return function(){
      console.everything.push({ 
        type: logType, 
        timeStamp: TS(), 
        value: Array.from(arguments) 
      })
      original.apply(console, arguments)
    }
  }

  ['log', 'error', 'warn', 'debug'].forEach(logType=>{
    console[logType] = hookLogType(logType)
  })
}

I also changed the timestamp format to use the ISO format in UTC timezone, to be able to compare time stamps in different time zones more easily.

If you're working on vue.js, you can actually do this:

data () {
    return {
        data: []
    }
},
created () {
    let current_log = console.log;

    console.log = msg => {
        if (msg !== undefined) this.data.push(msg);
        current_log.apply(null, arguments);
    }
}

All logs from console will be captured and stored in data

If you just want to catch windows errors (Browser's developer tool), you just need to use the window.onerror listener. and the most important thing is to keep returning it false because If you return true in your callback, then the propagation of the error will stop and won't be log in the console anymore .

window.onerror = function myErrorHandler(err, url, line) {  
    //Do some  stuff 
    console.log(err) // Uncaught SyntaxError: Invalid or unexpected token at Line no:- 1
    return false;   // so you still log errors into console 
}

本文标签： How to read from Chrome39s console in JavaScriptStack Overflow

版权声明：本文标题：How to read from Chrome&#39;s console in JavaScript - Stack Overflow 内容由网友自发贡献，该文观点仅代表作者本人， 转载请联系作者并注明出处：http://www.betaflare.com/web/1736819392a1954221.html， 本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如发现本站有涉嫌抄袭侵权/违法违规的内容，一经查实，本站将立刻删除。