My current project generates warnings, logs, and errors in case of any issues. I would like to provide users with a button that allows them to click and download the console.log data as a text file. Whether it is through a browser extension or using JavaScript and jQuery, I am open to implementing it in either way.
The ultimate goal is to have all this information saved in a text file for easy access.
One method is to develop custom functions for console.log, console.error, and other output methods that store the messages in a variable:
var log = "";
var myConsole = {};
myConsole.log = function(txt) {
log += txt + "\n";
console.log(txt);
}
Afterwards, you can generate a downloadable file containing the contents of the log variable. Refer to Create a file in memory for user to download, not through server for various techniques on how to achieve this.
To address your query, you will need to follow two steps:
You can achieve this by creating a custom interface to replace the console object:
var consoleText = ""
// Create a new console
window.console = (function(console){
return {
log: function(text){
console.log(text);
consoleText += text;
},
info: function (text) {
console.info(text);
consoleText += text;
},
warn: function (text) {
console.warn(text);
consoleText += text;
},
error: function (text) {
console.error(text);
consoleText += text;
}
};
}(window.console));
To handle uncaught exceptions:
window.addEventListener('error', function(event) {
consoleText += event.message;
})
Following DevonTaig's solution on Writing html form data to a txt file without the use of a webserver:
function download(filename, text) {
var pom = document.createElement('a');
pom.setAttribute('href', 'data:text/plain;charset=utf-8,' + encodeURIComponent(text));
pom.setAttribute('download', filename);
document.body.appendChild(pom);
pom.click();
document.body.removeChild(pom);
}
download("log.txt", consoleText)
Recently discovered a library created by an individual which can be found here.
Decided to incorporate some code to demonstrate its functionality:
<html>
<script type="text/javascript" src="./FileSaver.js"></script>
<body>
<h1>Logging Downloads</h1>
<script>
// Keeping track of logs in memory for later file writing.
let logList = [];
function downloadLogs() {
var blob = new Blob([logList.toString()], {type: "text/plain;charset=utf-8"});
saveAs(blob, "logFile.log");
}
function createLogMessage(){
logList.push('log message....');
}
</script>
<button type="button" onclick="downloadLogs()">Create Log!</button>
<button type="button" onclick="createLogMessage()">Write Log!</button>
</body>
</html>
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