Question

184

How can I check if a file contains a string or a variable in JavaScript?

rated 0 times [ 187] [ 3] / answers: 1 / hits: 92344 / 11 Years ago, wed, july 3, 2013, 12:00:00

Is it possible to open a text file with JavaScript (location like
http://example.com/directory/file.txt) and check if the file contains a given string/variable?

In PHP this can be accomplished easily with something like:

$file = file_get_contents("filename.ext");

if (!strpos($file, "search string")) {

    echo "String not found!";

} else {

    echo "String found!";

}

Is there a way to do this? I'm running the "function" in a .js file with Node.js, appfog.

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loganl

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answered 11 Years ago sabrina · Accepted Answer

You can not open files client side with javascript.

You can do it with node.js though on the server side.

fs.readFile(FILE_LOCATION, function (err, data) {

  if (err) throw err;

  if(data.indexOf('search string') >= 0){

   console.log(data) //Do Things

  }

});

Newer versions of node.js (>= 6.0.0) have the includes function, which searches for a match in a string.

fs.readFile(FILE_LOCATION, function (err, data) {

  if (err) throw err;

  if(data.includes('search string')){

   console.log(data)

  }

});