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This article mainly explains "what is the focus in javascript". The content in the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "what is the focus in javascript".

In javascript, the focus is the area of attention, that is, the current location where the cursor is activated, and a small vertical bar flashing in the page screen, indicating that a control on the web page is selected and can be manipulated; you can get the focus through the focus () method and move the focus away by the blur () method.

The operating environment of this tutorial: windows7 system, javascript1.8.5 version, Dell G3 computer.

What is the focus in javascript?

In JavaScript, the focus is the area of attention, that is, where the current cursor is activated, and a small vertical bar that flashes on the page screen, indicating that a control on the page is selected and can be manipulated. Click the mouse to get the cursor, and the Tab key can switch focus according to the set Tabindex.

For example, when a text box gets focus, the characters you type on the keyboard go directly into the text box; for example, a drop-down list box gets focus, and you press the down arrow on the keyboard, and it lists the list. There are also events in the program that get focus (gotfocus ()) and lose focus (lostfocus ()), as well as the focus method for the control (setfocus ()). Making good use of focus can make your program look very human.

Get the focus, the area that can work, including the Activity interface and visual controls, etc., and enable the area to automatically perform certain actions (such as scrolling and animation) or the occurrence of a logical event; it can also manually perform click events and operations to get focus. Whether the area (Activity interface, controls, etc.) works and responds depends on whether it gains focus or not.

Methods for JavaScript to get focus and move focus away:

JavaScript can get the focus through the focus () method and move the focus away by the blur () method.

Get focus:

The focus () method is used to give focus to the checkbox.

Syntax:

CheckboxObject.focus ()

Lose focus:

The blur () method is used to move focus away from the radio button.

Grammar.

RadioObject.blur ()

Example:

The following example sets or removes the focus on the radio button:

Function setFocus () {document.getElementById ('check1') .focus ()} function loseFocus () {document.getElementById (' check1') .blur ()}

Effect picture:

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