GET function console error

Question

The logic:

my_function looks through file.txt, if it finds the word "Hello", returns true. If not, false.

The problem:

Uncaught type error: contents.includes is not a function

Limitations:

Can only use plain javascript

function my_function() { var xhttp = new XMLHttpRequest(); xhttp.onreadystatechange = function(contents) { if (this.readyState == 4 && this.status == 200) { //contents variable now contains the contents of the textfile as string //check if text file contains the word Hello var hasString = contents.includes("Hello"); //outputs true if contained, else false console.log(hasString); } }; xhttp.open("GET", "http://www.example.com/file.txt", true); xhttp.send(); }

Try var hasString = contents.indexOf("Hello") > -1; Also, check if includes is supported in your browser. — Tushar
– Tushar, Commented Oct 13, 2016 at 3:16
You need to check if the "contents" is not empty/undefined add this: var hasString; if (contents !== undefined && contents !== "") { hasString = contents.includes("Hello"); } Make sure the result coming back is not empty. Checking the status is not enough in this context. — Ben Bozorg
– Ben Bozorg, Commented Oct 13, 2016 at 3:19
@Malasorte Let me know if that works. Execute 'abc'.includes('a') in browser and see if you're getting error or true. — Tushar
– Tushar, Commented Oct 13, 2016 at 3:20

Beginner · Accepted Answer · 2016-10-13 03:50:25Z

use this.responseText instead of that parameter contents
this.responseText is the response of your ajax

function my_function() { var xhttp = new XMLHttpRequest(); xhttp.onreadystatechange = function() { if (this.readyState == 4 && this.status == 200) { //contents variable now contains the contents of the textfile as string //check if text file contains the word Hello var hasString = this.responseText.includes("Hello"); //outputs true if contained, else false console.log(hasString); } }; xhttp.open("GET", "http://www.example.com/file.txt", true); xhttp.send(); }

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