What is the function of html label tag? Detailed explanation of how to use the html label tag

This article mainly introduces the introduction of the dare html label tag, as well as the main usage scenarios of the html label tag, and finally there are comments about the html label tag. Now let's take a look at this article

First let's take a look at the introduction of the html label tag:

The label tag defines the label (mark) for the input element, which No special effects will be presented to the user, similar to the span tag. But the biggest difference between the label label and the span label is that it improves usability for mouse users and can be associated with specific form controls.

After the label label is associated with a specific form control, if the user clicks the text within the label element, the associated form control will be triggered. That is to say, when the user selects the label label, the browser will automatically turn the focus to the form control related to the label label.

html The main usage scenarios of the label label:

The label label is often used to associate with a checkbox or radio, so that the checkbox or radio can be selected/cancelled by clicking on the text. As shown in the figure below, clicking on text has the same effect as clicking on the previous radio button, that is, the clickable area of ​​the control is enlarged, because clicking on the label or control will activate the control, which is especially useful for check boxes and radio buttons.

Now let’s talk about the use of the html label tag:

The label defines the label (mark) for the input element. The label element does not present any special effects to the user. However, it improves usability for mouse users. This control is triggered if you click on the text inside the label element. That is to say, when the user selects the label, the browser will automatically turn the focus to the form control related to the label. The label's for attribute should be the same as the related element's id attribute. Example of a simple HTML form with two input fields and related tags:

<form> 
<label for="male">两个人</label> 
<input type="radio" name="sex" id="male" />
<label for="female">一个人</label> 
<input type="radio" name="sex" id="female" />
</form>

This is a radio button, so there is no need to display the effect.

Finally, let’s take a look at the comments about the html label tag:

To bind LABEL to other controls, set the FOR attribute of the LABEL element to The same ID as the control. Binding LABEL to the control's NAME property is useless. However, to submit the form, you must specify a name for the control to which the LABEL element is bound.

There are two ways to add an underline to the specified shortcut key. Rich text support for the LABEL element allows the addition of U elements on either side of the accelerator character specified by the ACCESSKEY attribute. If you prefer to use a style sheet (CSS) to apply the style, you can include the character in a SPAN and set the style to "text-decoration: underline".

If the user clicks LABEL, the onclick event on LABEL will be triggered first, and then the onclick event on the control specified by the htmlFor attribute will be triggered. Pressing the shortcut key set by LABEL will set the focus but not trigger the onclick event.

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