How to pop up a prompt box using javascript

In web development, pop-up prompt boxes are a very common thing, especially for user operation prompts, confirmations, warnings, etc., which need to be interacted in the form of pop-up boxes, and at the same time, certain feedback can be given to the user. JavaScript provides the function of popping up a prompt box. Below I will introduce how to use JavaScript to pop up a prompt box.

JavaScript provides three different types of pop-up windows: warning box (alert), confirmation box (confirm) and prompt box (prompt). These three types of pop-up windows are very simple and easy to use and do not require many parameters.

1. Warning box (alert)

The warning box is the simplest pop-up window, usually used to prompt the user with certain warning information. It requires only one parameter, the information to be displayed.

Syntax:

alert(message);

Among them, message is the string information to be displayed.

For example:

alert("欢迎使用JavaScript弹窗");

After the warning box appears, the screen will be forced to pause until the user clicks the "OK" button. Alert boxes do not support custom button text and custom styles.

2. Confirmation box (confirm)

Confirmation boxes are usually used to ask the user whether they want to perform an operation. It requires two parameters. The first parameter is the prompt information to be displayed, and the second parameter is a callback function to handle the user's click event.

Syntax:

confirm(message, callback);

Among them, message is the string information to be displayed, and callback is the callback function, which will be called when the user clicks OK or Cancel. If the user clicks OK, the return value of the callback function is true, otherwise it returns false.

For example:

confirm("确定要删除这条记录吗？", function(result){ if(result){ //用户点击了确定按钮 //执行删除操作 }else{ //用户点击了取消按钮 //不执行删除操作 } });

The confirmation box supports custom button text and custom styles.

3. Prompt box (prompt)

The prompt box is used to allow the user to enter some information. It requires two parameters, the first parameter is the prompt information to be displayed, and the second parameter is the default value of the user input box (optional).

Syntax:

prompt(message, defaultValue);

For example:

var name = prompt("请输入您的姓名：", "张三"); if(name){ alert("您好，" + name); }else{ alert("您取消了输入！"); }

The prompt box supports customizing the default value of the input box, customizing the button text, and customizing the style.

Summary:

The above three pop-up windows are commonly used pop-up window methods in JavaScript. You can choose the corresponding pop-up window type according to your needs. In actual development, it should be noted that pop-up windows will block user interaction. If the frequency of pop-up windows is too high, the user experience will be affected, so the frequency of use of pop-up windows needs to be appropriately controlled.

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