JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" id="str_search" value=" "/>
<input type="button" id="search_str" value="search" />

JavaScript

var array = ["php", "jquery", "java"];
var src_keyword = "";
$(document).ready(function () {
    $("#search_str").click(function () {
        src_keyword = $("#str_search").val().trim();
        var res = $.grep(array,function(obj,_){
            return obj === src_keyword;
        });
       if(res.length == 0) alert('not found'); else alert('found');
    });
});