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Javascript how can I find character “utf-16” at string

Have a question. Sorry for my English.

I have a string. Customer enter SMS text at text-area.
How can I find the existing character of utf-16 at the string or not?

utf-16

At php I check this code:

if (iconv("UTF-8","UTF-8//IGNORE",$_entry_text) != $_entry_text) {
// exist utf-16
}


How can I at Javascript check? Try to find an answer the second day ((

Thanks.

3 Answers
3

If it's a short string, one method would be to just look across the length of it and check if any of the char-codes sit outside of the single-byte 0-255 range

if (_entry_text.charCodeAt(i) > 255) ...


A string is a series of characters, each which have a character code. ASCII defines characters from 0 to 127, so if a character in the string has a code greater than that, then it is a Unicode character. This function checks for that. See String#charCodeAt.

function hasUnicode (str) {
for (var i = 0; i < str.length; i++) {
if (str.charCodeAt(i) > 127)
return true;
}
return false;
}


Then use it like, hasUnicode("Test message");

I think there is no need for a loop;

var ascii = /^[ -~]+$/;

ascii.test("Sefa"); // it is true no non-ascii characters
ascii.test("Sefa£"); // it is false there is non-ascii character


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