How could i check if a string contains an element of an array
Question
I have a textarea, and I need to check if this textarea.value contains a string from a string array. Every onkeyup in textarea I call this script. I tried this code, but something went wrong. "@" is ok, but "apple" and "orange" is not. Please help me! Thanks!
var str = document.getElementById("messageArea").value;
var arr = ["@", "apple", "orange"];
for (var i = arr.length - 1; i >= 0; --i) {
if (str.indexOf(arr[i]) != -1) {
alert('contains');
} else {
alert('not contains');
}
}
2 answers
solution1
1 ACCPTED 2016-01-31 12:06:52
Break the loop when the message contains the substring.
$("#messageArea").on("keyup",function(e){ var str = document.getElementById("messageArea").value; var arr = ["@", "apple", "orange"]; for (var i = arr.length - 1; i >= 0; --i) { if (str.indexOf(arr[i]) != -1) { $('#messageBtn').prop('disabled',false); break; } else { $('#messageBtn').prop('disabled',true); } } });
<!DOCTYPE html> <html> <head> <script src="https://code.jquery.com/jquery-1.11.3.js"></script> <meta charset="utf-8"> <meta name="viewport" content="width=device-width"> <title>JS Bin</title> </head> <body> <textarea type="text" id="messageArea"></textarea> <button disabled id="messageBtn">submit</button> </body> </html>
solution2
0 2016-01-31 12:10:03
var str = "@ apple orange"; //document.getElementById("messageArea").value;
var arr = ["@", "apple", "orange"];
str = str.trim();
var parts = str.split(" "); // split textarea string by space into another array
for (var part in parts) { // iterate one every part and check it with your arr variable
if ( arr.indexOf(parts[part]) != -1 ) {
alert("found: " + parts[part] );
} else {
alert("not contains " + parts[part]);
}
}
you will get alerts for all 3 elements in the str variable.
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