Search/Filter Javascript Array which was created from a text file
Question
I hope someone have an idea or could give me some input on my problem.
Starting scenario: A .txt Logfile is created by a software and I try to create a website query which shows contained error messages from that log clearly arranged among each other.
So far I have the code to read the file as a variable, map the content as an array and split it to single lines.
<html>
<div>
Select Errorlog:
<input type="file" id="fileInput">
</div>
<pre id="displayFile"></pre>
<script>
var fileInput = document.getElementById('fileInput');
fileInput.addEventListener('change', function(e) {
var file = fileInput.files[0];
var reader = new FileReader();
reader.onload = function(e) {
var dateiinhalt = reader.result;
var arr = dateiinhalt.split("\n");
document.getElementById("Errorlog").innerHTML = arr[1];
};
reader.readAsText(file);
});
</script>
<p id="Errorlog"></p>
</html>
That was the easy job, but now I'm desperate to filter the array or to display certain index values of the array.
The Logfile itself looks like
2020-02-26 00:00:00 | ERROR | Message
2020-02-26 00:00:01 | INFO | NewEvent
2020-02-26 00:00:01 | ERROR | Message 2
The goal is to show every line which contains "ERROR" at once. I tried several filter/search functions, but everything I tried did not work (fe array.prototype.filter or indexOf).
1 answers
solution1
0 ACCPTED 2020-02-26 17:15:58
Assuming that after the .split() you have an array of log lines as strings, a simple way to filter it for errors would be:
var arr = dateiinhalt.split("\n");
arr = arr.filter(line => line.indexOf("ERROR") >= 0);
or, in a more old-fashioned style:
arr = arr.filter(function(line) { return line.indexOf("ERROR") >= 0; });
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