JQuery focusin()用法及代碼示例

jQuery focusin()是一種內置方法，用於獲得對所選元素的關注。

用法:

$(selector).focusin(function);

參數：它接受一個可選參數“function”，該參數獲得所選元素的焦點。

jQuery 示例展示 focusin() 方法的用法原理：
示例 1：在下麵的代碼中，傳遞了參數函數。

HTML


<!DOCTYPE html>
<html>
<head>
    <script src=
"https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js">
    </script>
    <!-- jQuery code to show the working of this method -->
    <script>
        $(document).ready(function () {
            $("div").focusin(function () {
                $(this).css("background-color", "green");
            });
        });
    </script>
    <style>
        div {
            border: 2px solid black;
            width: 50%;
            padding: 20px;
        }
        input {
            padding: 5px;
            margin: 10px;
        }
    </style>
</head>
<body>
    <!-- click inside the field focusin will take place -->
    <div>
        Enter name:
        <input type="text">
        <br>
    </div>
</body>
</html>

輸出：

示例 2：在下麵的代碼中，沒有傳遞任何參數。

HTML


<!DOCTYPE html>
<html>
<head>
    <script src=
"https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js">
    </script>
    <!-- jQuery code to show the working of this method -->
    <script>
        $(document).ready(function () {
            $("#foc").click(function () {
                $(this).focusin().css(
                    "background-color", "lightgreen");
            });
        });
    </script>
    <style>
        div {
            border: 2px solid black;
            width: 50%;
            padding: 20px;
        }
        input {
            padding: 5px;
            margin: 10px;
        }
    </style>
</head>
<body>
    <!-- click inside the field focusin will take place and
    background color becomes change -->
    <div>
        Enter name:
        <input id="foc" type="text">
        <br>
    </div>
</body>
</html>

輸出：

相關用法

注：本文由純淨天空篩選整理自kundankumarjha大神的英文原創作品 jQuery focusin() Method。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。