## AutoConnectButton ### Constructor ```cpp AutoConnectButton(const char* name = "", const char* value = "", const String& action = String()) ```

**Parameters**: nameThe element name.; valueValue of the element.; actionNative code of the action script executed when the button is clicked.

### Public member variables #### action HTML native code of the action script to be executed when the button is clicked. It is mostly used with a JavaScript to activate a script.[^1]

**Type**: String

[^1]:JavaScript can be inserted into a custom Web page using AutoConnectElement. #### enable Enable HTML tag generation for the element. AutoConnect will generate the element into HTML only if the enable attribute is true.

**Type**: boolean

#### name The element name.

**Type**: String

#### value Value of the element.

**Type**: String

### Public member functions #### typeOf ```cpp ACElement_t typeOf(void) ``` Returns type of AutoConnectElement.

**Return value**: AC_Button

## AutoConnectCheckbox ### Constructor ```cpp explicit AutoConnectCheckboxBasis(const char* name = "", const char* value = "", const char* label = "", const bool checked = false) ```

**Parameters**: nameThe element name.; valueValue of the element.; labelA label string prefixed to the checkbox.; checkChecked state of the checkbox.

### Public member variables #### checked It indicates the checked status of the checkbox. The value of the checked checkbox element is packed in the query string and sent by submit.

**Type**: Boolean

#### enable Enable HTML tag generation for the element. AutoConnect will generate the element into HTML only if the enable attribute is true.

**Type**: boolean

#### label A label is an optional string. A label is always arranged on the right side of the checkbox. Specification of a label will generate an HTML `#!html ` tag with an `id` attribute. The checkbox and the label are connected by the id attribute.

**Type**: String

#### name The element name.

**Type**: String

#### value Value of the element. It becomes a value attribute of an HTML `#!html ` tag.

**Type**: String

### Public member functions #### typeOf ```cpp ACElement_t typeOf(void) ``` Returns type of AutoConnectElement.

**Return value**: AC_Checkbox

## AutoConnectElement ### Constructor ```cpp AutoConnectElement(const char* name = "", const char* value = "") ```

**Parameters**: nameThe element name.; valueValue of the element.

### Public member variables #### enable Enable HTML tag generation for the element. AutoConnect will generate the element into HTML only if the enable attribute is true.

**Type**: boolean

#### name The element name.

**Type**: String

#### value Value of the element. It is output as HTML as it is as a source for generating HTML code.

**Type**: String

### Public member functions #### typeOf ```cpp ACElement_t typeOf(void) ``` Returns type of AutoConnectElement.

**Return value**: AC_Element

#### as ```cpp AutoConnectElement& as(void) ``` Casts the reference to the AutoConnectElement the specified type.

**Parameter**: TThe element type. AutoConnectElements type such as [AutoConnectButton](apielements.md#autoconnectbutton), [AutoConnectCheckbox](apielements.md#autoconnectcheckbox), [AutoConnectFile](apielements.md#autoconnectfile), [AutoConnectInput](apielements.md#autoconnectinput), [AutoConnectRadio](apielements.md#autoconnectradio), [AutoConnectSelect](apielements.md#autoconnectselect), [AutoConnectSubmit](apielements.md#autoconnectsubmit), [AutoConnectText](apielements.md#autoconnecttext).
**Return value**: A reference to the AutoConnectElement with actual type.

## AutoConnectFile ### Constructor ```cpp AutoConnectFile(const char* name = "", const char* value = "", const char* label = "", const ACFile_t store = AC_File_FS) ```

**Parameters**: nameThe element name.; valueFile name to be upload.; labelLabel string.; storeThe **ACFile_t** enumerator that represents the media to save the uploaded file.

### Public member variables #### enable Enable HTML tag generation for the element. AutoConnect will generate the element into HTML only if the enable attribute is true.

**Type**: boolean

#### label A label is an optional string. A label is always arranged on the left side of the file input box. Specification of a label will generate an HTML `#!html ` tag with an id attribute. The file input box and the label are connected by the id attribute.

**Type**: String

#### mimeType The mime type of the upload file which included as Media type in the http post request. Set by the client (usually the browser) that requested the upload. It is determined by the file type as `application/octet-stream`, `text` etc. which is described in [IANA Media Type](https://www.iana.org/assignments/media-types/media-types.xhtml).

**Type**: String

#### name The element name.

**Type**: String

#### size Size of the uploading file.

**Type**: size_t

#### store Specifies the save destination of the uploaded file. You can use the built-in uploader to save uploaded file to the flash of the ESP8266/ESP32 module or external SD media without writing a dedicated sketch code. It also supports saving to any destination using a custom uploader that inherits from the AutoConnectUploadHandler class.

**Type**: ACFile_t - **`AC_File_FS`** : Save the uploaded file to SPIFFS in the flash. - **`AC_File_SD`** : Save the uploaded file to SD. - **`AC_File_Extern`** : Save the file using your own upload handler.

#### value File name to be upload. The value contains the value entered by the client browser to the `#!html ` tag and is read-only.

**Type**: String

### Public member functions #### typeOf ```cpp ACElement_t typeOf(void) ``` Returns type of AutoConnectFile.

**Return value**: AC_File

## AutoConnectInput ### Constructor ```cpp AutoConnectInput(const char* name = "", const char* value = "", const char* label = "", const char* pattern = "", const char* placeholder = "") ```

**Parameters**: nameThe element name.; valueValue of the element.; labelLabel string.; patternRegular expression string for checking data format.; placeholderA placeholder string.

### Public member variables #### enable Enable HTML tag generation for the element. AutoConnect will generate the element into HTML only if the enable attribute is true.

**Type**: boolean

#### label A label is an optional string. A label is always arranged on the left side of the input box. Specification of a label will generate an HTML `#!html ` tag with an id attribute. The input box and the label are connected by the id attribute.

**Type**: String

#### name The element name.

**Type**: String

#### value Value of the element. It becomes a value attribute of an HTML `#!html ` tag. An entered text in the custom Web page will be sent with a query string of the form. The value set before accessing the page is displayed as the initial value.

**Type**: String

#### pattern A pattern specifies a regular expression that the input-box's value is checked against on form submission.

**Type**: String

#### placeholder A placeholder is an option string. Specification of a placeholder will generate a `placeholder` attribute for the input tag.

**Type**: String

### Public member functions #### isValid ```cpp bool isValid(void) ``` Evaluate the pattern as a regexp and return whether value matches. Always return true if the pattern is undefined.

**Return value**: trueThe value matches a pattern.; falseThe value does not match a pattern.

#### typeOf ```cpp ACElement_t typeOf(void) ``` Returns type of AutoConnectElement.

**Return value**: AC_Input

## AutoConnectRadio ### Constructor ```cpp AutoConnectRadio(const char* name = "", std::vector const& values = {}, const char* label = "", const ACArrange_t order = AC_Vertical, const uint8_t checked = 0) ```

**Parameters**: nameThe element name.; valuesAn array of values of the radio buttons. Specifies a [std::vector](https://en.cppreference.com/w/cpp/container/vector) object.; labelLabel string.; orderThe direction to arrange the radio buttons.; checkedAn index to be checked in the radio buttons.

### Public member variables #### checked Specifies the index number (1-based) of the **values** to be checked. If this parameter is not specified neither item is checked.

**Type**: uint8_t

#### enable Enable HTML tag generation for the element. AutoConnect will generate the element into HTML only if the enable attribute is true.

**Type**: boolean

#### label A label is an optional string. A label will be arranged in the left or top of the radio buttons according to the [order](#order).

**Type**: String

#### name The element name.

**Type**: String

#### order Specifies the direction to arrange the radio buttons. A label will place in the left or the top according to the **_order_**. It is a value of **ACArrange_t** type and accepts one of the following:

**Type**: ACArrange_t - **`AC_Horizontal`** : Horizontal arrangement. - **`AC_Vertical`** : Vertical arrangement.

#### values An array of String type for the radio button options. It is an initialization list can be used. The `#!html ` tags will be generated from each entry in the values.

**Type**: std::vector<String>

### Public member functions #### add ```cpp void add(const String& value) ``` Adds an option for the radio button.

**Parameter**: valueAn option string to add to the radio button.

#### check ```cpp void check(const String& value) ``` Indicates the check of the specified option for the radio buttons. You can use the **check** function for checking dynamically with arbitrary of the radio button.

**Parameter**: valueAn option string to be checked.

#### empty ```cpp void empty(const size_t reserve = 0) ``` Clear the array of option strings that AutoConnectRadio has in the values. When the **_reserve_** parameter is specified, a vector container of that size is reserved. The empty function resets the checked value to zero. When the empty function is executed, any button will be turned off.

**Parameter**: reserveReserved size of a container for the radio button option strings.

#### operator [ ] ```cpp const String& operator[] (const std::size_t n) ``` Returns a value string of the index specified by **_n_**.

**Parameter**: nIndex of values array to return. Its base number is 0.
**Return value**: A reference of a value string indexed by the specified the **n**.

#### size ```cpp size_t size(void) ``` Returns number of options which contained.

**Return value**: Number of options which contained.

#### typeOf ```cpp ACElement_t typeOf(void) ``` Returns type of AutoConnectElement.

**Return value**: AC_Radio

#### value ```cpp const String& value(void) const ``` Returns current checked option of the radio buttons.

**Return value**: A String of an option current checked. If there is no checked option, a null string returned.

## AutoConnectSelect ### Constructor ```cpp AutoConnectSelect(const char* name = "", std::vector const& options = {}, const char* label = "", const uint8_t selected = 0) ```

**Parameters**: nameThe element name.; optionsAn array of options of the select element. Specifies a [std::vector](https://en.cppreference.com/w/cpp/container/vector) object.; labelLabel string.; selectedAn option should be pre-selected when the page loads.

### Public member variables #### enable Enable HTML tag generation for the element. AutoConnect will generate the element into HTML only if the enable attribute is true.

**Type**: boolean

#### name The element name.

**Type**: String

#### label A label is an optional string. A label will be arranged in the top of the selection list.

**Type**: String

#### options An array of String type for the selection options. It is an initialization list can be used. The `#!html