How to set focus of jQuery Dialog component

In web development, pop-up windows are a common component that allow users to perform multiple tasks at the same time without leaving the current page. Among them, the jQuery Dialog component is widely used. It is very flexible and can customize various attributes to make the pop-up window more effective. In this article, we will focus on how to set the focus of the jQuery Dialog component.

1. Basic introduction to the jQuery Dialog component

Before using the jQuery Dialog component, we need to understand some basic concepts. jQuery Dialog is a plug-in based on the jQuery library. Its main function is to generate pop-up windows, including prompt boxes and dialog boxes. The pop-up interface has good visual effects and allows users to operate more intuitively.

Generally, we need to introduce the jQuery library and Dialog plug-in into the HTML page:

<script src="https://cdn.bootcss.com/jquery/3.2.1/jquery.min.js"></script>
<link rel="stylesheet" href="https://cdn.bootcss.com/jqueryui/1.12.1/jquery-ui.min.css">
<script src="https://cdn.bootcss.com/jqueryui/1.12.1/jquery-ui.min.js"></script>

After the introduction is completed, we can happily use the jQuery Dialog component. Below, we'll show you how to create a simple popup window.

2. How to create a simple jQuery Dialog pop-up window

Before creating a jQuery Dialog pop-up window, we need to consider the content of the pop-up window, such as title, message and button. The following is a simple example of a pop-up window:

$(function() {
  $("#dialog-message").dialog({
    modal: true,   // 是否模态弹窗
    resizable: false,   // 是否可以拖放调整弹窗大小
    buttons: {
      "确定": function() {
        $(this).dialog("close");
      }
    }
  });
});

We can first understand some attributes in the code:

• modal: Whether the pop-up window is modal, When true, no other operations are possible.
• resizable: Whether the pop-up window can be resized by dragging and dropping.
• buttons: The object literal of the method execution button. There is only one "OK" button here.

Among them, $("#dialog-message") is an empty div element we created in the HTML code to carry the pop-up content. In the jQuery code, we use the $("#dialog-message").dialog() method to generate a pop-up window and set some properties of the pop-up window.

3. How to set the focus of the jQuery Dialog pop-up window

By default, the focus of the jQuery Dialog pop-up window will first focus on the first input box or button button. However, in some cases, we need to manually set the focus position to make it more convenient for users to operate. So, how to set the focus of the jQuery Dialog pop-up window?

To set the focus of the jQuery Dialog pop-up window, we need to call the focus() method immediately after the pop-up window is displayed. Through this method, we can specify an element in the pop-up window to receive focus. The following is a sample code snippet:

$(function() {
  $("#dialog-message").dialog({
    modal: true,
    resizable: false,
    buttons: {
      "确定": function() {
        $(this).dialog("close");
      }
    },
    open: function(event, ui) {
      // 将焦点设置到id为input-dialog-message的元素上
      $("#input-dialog-message").focus();
    }
  });
});

In the above code, we listen to the open event of the pop-up window through the open attribute, and set the focus to the id of # when the event is executed. ##input-dialog-message element.

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