How to get the value of input in JS?-JS Tutorial-php.cn

How to get the value of input in JS?

Guanhui

Release： 2020-06-04 09:56:48

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How to get the value of input in JS?

#JS How to get the value of input?

First use "querySelector()" to obtain the element object, and only need to pass the input selection rules to this method;

Code example

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var inputEl = document.querySelector('[name="username"]');

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Finally, The value attribute in the input element object is the value of the input, so you only need to get this attribute.

var inputEl = document.querySelector('[name="username"]');

var val = inputEl.value;

console.log(val);

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input attribute HTML5

##AttributeValueDescriptionacceptSpecifies the type of file submitted via file upload. alignalttextDefine the alternative text for the image input. autocompleteSpecifies whether to use the input field autocomplete feature. autofocusautofocuscheckedcheckedSpecifies that this input element is the first time Should be selected when loading. disableddisabledDisables this element when the input element loads. form Specifies one or more forms to which the input field belongs. formactionformenctypeSee noteformmethodformnovalidateformnovalidateformtarget


	mime_type
	left right top middle bottom	Deprecated. Specifies the alignment of image input.

	on off
		Specifies whether the input field gets focus when the page loads. (Not applicable to type="hidden")


	formname
	URL	Override the action attribute of the form. (Applies to type="submit" and type="image")
		Override the enctype attribute of the form. (Applies to type="submit" and type="image")
	get post	Override the method attribute of the form. (Applies to type="submit" and type="image")
		Override the novalidate attribute of the form. If this attribute is used, validation will not be performed when submitting the form.
	_blank _self _parent _top framename	Override the form's target attribute. (Applies to type="submit" and type="image")
height	pixels %	Define the height of the input field. (Applies to type="image")
list	datalist-id	refers to a predefined containing input field datalist of options.
max	number date	Specifies the maximum value of the input field. Please use it with the "min" attribute to create a range of legal values.
maxlength	number	Specifies the maximum length of characters in the input field.
min	number date	Specifies the minimum value of the input field. Please use it with the "max" attribute to create a range of legal values.
multiple	multiple	If this attribute is used, more than one value is allowed.
name	field_name	Define the name of the input element.
pattern	regexp_pattern	Specifies the pattern or format of the value of the input field. For example, pattern="[0-9]" means that the input value must be a number between 0 and 9.
placeholder	text	Specifies prompts to help the user fill in the input field.
readonly	readonly	Specifies that the input field is read-only.
required	required	Indicates that the value of the input field is required.
size	number_of_char	Define the width of the input field.
src	URL	Defines the URL of the image displayed as a submit button.
step	number	Specifies the legal digit interval of input characters.
type	button checkbox file hidden image password radio reset submit text	Specify the type of input element.
value	value	Specifies the value of the input element.
width	pixels %	Define the width of the input field. (Applicable to type="image")

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