## The elements for the custom Web pages Representative HTML elements for making the custom Web page are provided as AutoConnectElements. - [AutoConnectButton](#autoconnectbutton): Labeled action button - [AutoConnectCheckbox](#autoconnectcheckbox): Labeled checkbox - [AutoConnectElement](#autoconnectelement-a-basic-class-of-elements): General tag - [AutoConnectInput](#autoconnectinput): Labeled text input box - [AutoConnectRadio](#autoconnectradio): Labeled radio button - [AutoConnectSelect](#autoconnectselect): Selection list - [AutoConnectSubmit](#autoconnectsubmit): Submit button - [AutoConnectText](#autoconnecttext): Style attributed text ## Layout on a custom Web page You can specify the direction to arrange the radio buttons as [**AutoConnectRadio**](#autoconnectradio) vertically or horizontally. Other elements are arranged vertically in the order of addition to AutoConnectAux. This basic layout depends on the CSS of the AutoConnect menu so it can not be changed drastically. ## Form and AutoConnectElements All AutoConnectElements placed on a custom Web page are included in one form. Its form is fixed and created by AutoConnect. The form's value (usually the text or checkbox you entered) is sent by [AutoConnectSubmit](#autoconnectsubmit) using the POST method. **name** and **value** of each AutoConnectElement which own form-data are reflected in the query string when the custom Web page was sent. You can retrieve the value in the sketch as the parameter's value of the query string with [**ESP8266WebServer::arg**](https://github.com/esp8266/Arduino/tree/master/libraries/ESP8266WebServer#getting-information-about-request-arguments) function or **PageArgument** class of [**AutoConnect::on**](api.md#on) handler when the form is submitted. ## AutoConnectElement - A basic class of elements AutoConnectElement is a base class for other element classes and has common attributes for all elements. It can also be used as a [variant](#variant-for-autoconnectelements) of each element. The following items are attributes that AutoConnectElement has and are common to other elements. **Sample**
`AutoConnectElement element("element", "
");`
On the page:
### Constructor ```cpp AutoConnectElement(const char* name, const char* value) ``` ### name Each element has a name. **Name** is the String data type. To access its element in the sketches you can identify by the name. Its method is useful for loading elements in JSON. In the load function of AutoConnectElement(s) described [**later**](acjson.md), these objects are not created in advance by sketches. Therefore, access to the attribute of that element by the **name** as follows: ```cpp hl_lines="4 10" AutoConnectAux customPage("/custom_page", "Custom page"); const char ELEMENT_TEXT[] PROGMEM = R"( { "name": "text1", "type": "ACText", "value": "Hello, world" } )"; customPage.loadElement(ELEMENT_TEXT); AutoConnectText& text1 = customPage.getElement("text1"); text1.style = "text-align:center;color:#2f4f4f;" ``` The above example accesses the *text1* element which loaded from JSON using AutoConnectAux's [**getElement**](apiaux.md#getelement) function by name and sets the [**style**](#style) attribute. ### value **Value** is the source of the HTML code generated with the element and its data type is String. Characteristics of Value vary depending on the element. The value of AutoConnectElement is native HTML code. A string of value is output as HTML as it is.
### type **Type** indicates the type of the element and represented as the *ACElement_t* enumeration type in the sketch. Since AutoConnectElement also acts as a variant of other elements, it can be applied to handle elements collectively. At that time, the type can be referred to by the [**typeOf()**](apielements.md#typeof) function. The following example changes the font color of all [AutoConnectText](#autoconnecttext) elements of a custom Web page to gray. ```cpp hl_lines="5" AutoConnectAux customPage; AutoConnectElementVT& elements = customPage.getElements(); for (AutoConnectElement& elm : elements) { if (elm.typeOf() == AC_Text) { AutoConnectText& text = reinterpret_cast(elm); text.style = "color:gray;"; } } ``` The enumerators for *ACElement_t* are as follows: - AutoConnectButton: **AC_Button** - AutoConnectCheckbox: **AC_Checkbox** - AutoConnectElement: **AC_Element** - AutoConnectInput: **AC_Input** - AutoConnectRadio: **AC_Radio** - AutoConnectSelect: **AC_Select** - AutoConnectSubmit: **AC_Submit** - AutoConnectText: **AC_Text** - Uninitialized element: **AC_Unknown** Furthermore, to convert an entity that is not an AutoConnectElement to its native type, you must [re-interpret](https://en.cppreference.com/w/cpp/language/reinterpret_cast) that type with c++. ## AutoConnectButton AutoConnectButton generates an HTML `