Question

I have input text element, I want: when I write some symbol in this input, alert this symbol,
that is if I write symbol “a”, immediately alert(“a”), how to make this? I trying, but it not working

$("input").on("keypress", function () {
                setTimeout (function () {               
                    var search_word =  $(this).val();
                    if ( search_word.length > 0 ) {
                        alert(search_word);
                    }
                },200);
            });

Answer 1

You are having problems with the variable scope. this refers to the inner function..

Use this instead:

$("input").on("keypress", function () {
    var that = this;
    setTimeout (function () {               
        var search_word =  $(that).val();
        if ( search_word.length > 0 ) {
            alert(search_word);
        }
    },200);
});​

JSFIDDLE