Let sourced names be an initially empty ordered list of tuples consisting of a string, an element, a source, where the source is either id , name , or past , and, if the source is past , an age.
For each listed element candidate whose form owner is the form element, with the exception of any input elements whose type attribute is in the Image Button state:. If candidate has an id attribute, add an entry to sourced names with that id attribute's value as the string, candidate as the element, and id as the source. If candidate has a name attribute, add an entry to sourced names with that name attribute's value as the string, candidate as the element, and name as the source.
For each img element candidate whose form owner is the form element:. For each entry past entry in the past names map add an entry to sourced names with the past entry 's name as the string, past entry 's element as the element, past as the source, and the length of time past entry has been in the past names map as the age.
Sort sourced names by tree order of the element entry of each tuple, sorting entries with the same element by putting entries whose source is id first, then entries whose source is name , and finally entries whose source is past , and sorting entries with the same element and source by their age, oldest first.
Remove any entries in sourced names that have the empty string as their name. Remove any entries in sourced names that have the same name as an earlier entry in the map.
Return the list of names from sourced names , maintaining their relative order. To determine the value of a named property name for a form element, the user agent must run the following steps:. Let candidates be a live RadioNodeList object containing all the listed elements , whose form owner is the form element, that have either an id attribute or a name attribute equal to name , with the exception of input elements whose type attribute is in the Image Button state, in tree order.
If candidates is empty, let candidates be a live RadioNodeList object containing all the img elements, whose form owner is the form element, that have either an id attribute or a name attribute equal to name , in tree order. If candidates is empty, name is the name of one of the entries in the form element's past names map : return the object associated with name in that map.
If candidates contains more than one node, return candidates. Otherwise, candidates contains exactly one node. Add a mapping from name to the node in candidates in the form element's past names map , replacing the previous entry with the same name, if any. Return the node in candidates. If an element listed in a form element's past names map changes form owner , then its entries must be removed from that map. The submit method, when invoked, must submit the form element from the form element itself, with the submitted from submit method flag set.
The requestSubmit submitter method, when invoked, must run the following steps:. If submitter is not a submit button , then throw a TypeError. Otherwise, set submitter to this form element. Submit this form element, from submitter. The reset method, when invoked, must run the following steps:. If the form element is marked as locked for reset , then return.
Mark the form element as locked for reset. Reset the form element. Unmark the form element as locked for reset. If the checkValidity method is invoked, the user agent must statically validate the constraints of the form element, and return true if the constraint validation return a positive result, and false if it returned a negative result.
If the reportValidity method is invoked, the user agent must interactively validate the constraints of the form element, and return true if the constraint validation return a positive result, and false if it returned a negative result.
HTML element represents a caption for an item in a user interface. Phrasing content. Interactive content. Contexts in which this element can be used : Where phrasing content is expected.
Content model : Phrasing content , but with no descendant labelable elements unless it is the element's labeled control , and no descendant label elements. Content attributes : Global attributes for — Associate the label with form control Accessibility considerations : For authors.
The caption can be associated with a specific form control, known as the label element's labeled control , either using the for attribute, or by putting the form control inside the label element itself. Except where otherwise specified by the following rules, a label element has no labeled control. The for attribute may be specified to indicate a form control with which the caption is to be associated.
If the attribute is specified, the attribute's value must be the ID of a labelable element in the same tree as the label element. If the attribute is specified and there is an element in the tree whose ID is equal to the value of the for attribute, and the first such element in tree order is a labelable element , then that element is the label element's labeled control.
If the for attribute is not specified, but the label element has a labelable element descendant, then the first such descendant in tree order is the label element's labeled control. The label element's exact default presentation and behavior, in particular what its activation behavior might be, if anything, should match the platform's label behavior.
The activation behavior of a label element for events targeted at interactive content descendants of a label element, and any descendants of those interactive content descendants, must be to do nothing.
Form-associated custom elements are labelable elements , so for user agents where the label element's activation behavior impacts the labeled control , both built-in and custom elements will be impacted. For example, on platforms where clicking a label activates the form control, clicking the label in the following snippet could trigger the user agent to fire a click event at the input element, as if the element itself had been triggered by the user:.
Similarly, assuming my-checkbox was declared as a form-associated custom element like in this example , then the code. On other platforms, the behavior in both cases might be just to focus the control, or to do nothing. This form will contain a number of control types that you may not yet understand. Don't worry about this for now; you'll find out how they work in the next article Basic native form controls.
For now, read the descriptions carefully as you follow the below instructions, and start to form an appreciation of which wrapper elements we are using to structure the form, and why. You can see the finished form in action below also find it on GitHub — see our payment-form. You've reached the end of this article, but can you remember the most important information? You can find a further test to verify that you've retained this information before you move on — see Test your skills: Form structure.
You now have all the knowledge you'll need to properly structure your web forms. We will cover many of the features introduced here in the next few articles, with the next article looking in more detail at using all the different types of form widgets you'll want to use to collect information from your users.
Skip to main content Skip to search Skip to select language Learn web development Web forms — Working with user data How to structure a web form Change language. Previous Overview: Forms Next With the basics out of the way, we'll now look in more detail at the elements used to provide structure and meaning to the different parts of a form.
Objective: To understand how to structure HTML forms and give them semantics so they are usable and accessible. We already met this in the previous article. To start with, make a local copy of our blank template file and the CSS for our payment form in a new directory on your computer. How to build custom form controls Sending forms through JavaScript Property compatibility table for form widgets.
In an HTML document, an element must receive focus from the user in order to become active and perform its tasks. For example, users must activate a link specified by the A element in order to follow the specified link. The tabbing order defines the order in which elements will receive focus when navigated by the user via the keyboard. The tabbing order may include elements nested within other elements.
Elements that may receive focus should be navigated by user agents according to the following rules:. In this example, the tabbing order will be the BUTTON , the INPUT elements in order note that "field1" and the button share the same tabindex, but "field1" appears later in the character stream , and finally the link created by the A element.
Tabbing keys. The actual key sequence that causes tabbing navigation or element activation depends on the configuration of the user agent e.
User agents may also define key sequences to navigate the tabbing order in reverse. When the end or beginning of the tabbing order is reached, user agents may circle back to the beginning or end. Pressing an access key assigned to an element gives focus to the element. The action that occurs when an element receives focus depends on the element. For example, when a user activates a link defined by the A element, the user agent generally follows the link.
When a user activates a radio button, the user agent changes the value of the radio button. When the user activates a text field, it allows input, etc. Typing the access key gives focus to the label which in turn gives it to the associated control. In this example, we assign an access key to a link defined by the A element. Typing this access key takes the user to another document, in this case, a table of contents.
The invocation of access keys depends on the underlying system. For instance, on machines running MS Windows, one generally has to press the "alt" key in addition to the access key. On Apple systems, one generally has to press the "cmd" key in addition to the access key.
The rendering of access keys depends on the user agent. We recommend that authors include the access key in label text or wherever the access key is to apply. User agents should render the value of an access key in such a way as to emphasize its role and to distinguish it from other characters e. In contexts where user input is either undesirable or irrelevant, it is important to be able to disable a control or render it read-only. For example, one may want to disable a form's submit button until the user has entered some required data.
Similarly, an author may want to include a piece of read-only text that must be submitted as a value along with the form.
The following sections describe disabled and read-only controls. When set, the disabled attribute has the following effects on an element:. How disabled elements are rendered depends on the user agent. For example, some user agents "gray out" disabled menu items, button labels, etc. Therefore, it cannot receive user input nor will its value be submitted with the form. The only way to modify dynamically the value of the disabled attribute is through a script.
The readonly attribute specifies whether the control may be modified by the user. When set, the readonly attribute has the following effects on an element:. The only way to modify dynamically the value of the readonly attribute is through a script.
This attribute may take two values:. The "get" method should be used when the form is idempotent i. Many database searches have no visible side-effects and make ideal applications for the "get" method.
If the service associated with the processing of a form causes side effects for example, if the form modifies a database or subscription to a service , the "post" method should be used. A successful control is "valid" for submission. Every successful control has its control name paired with its current value as part of the submitted form data set.
A successful control must be defined within a FORM element and must have a control name. If a control doesn't have a current value when the form is submitted, user agents are not required to treat it as a successful control.
Hidden controls and controls that are not rendered because of style sheet settings may still be successful. For example:. When the user submits a form e. The form data set is then encoded according to the content type specified by the enctype attribute of the FORM element. Finally, the encoded data is sent to the processing agent designated by the action attribute using the protocol specified by the method attribute.
If that is the case, just do two separate forms and use CSS to position them. A possibility is to have an iframe inside the outer form. The iframe contains the inner form. It features a text input field, you won't even have to put your code on a server No, it is not valid.
But a "solution" can be creating a modal window outside of form "a" containing the form "b". It can be easily done if you are using bootstrap or materialize css. I'm doing this to avoid using iframe. As workaround you could use formaction attribute on submit button.
And just use different names on your inputs. I tried to use a code-playground website to show a demo, but many of them prohibit embedding their websites in iframes, even within their own domain. How are we doing? Please help us improve Stack Overflow. Take our short survey. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams?
Collectives on Stack Overflow. Learn more. Is it valid to have a html form inside another html form? Ask Question. Asked 12 years, 9 months ago. Active 1 year, 2 months ago. Viewed k times. If it isn't possible, what workarounds for this situation are available?
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