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HTML Forms

Submission contracts, field names, labels, choices, validation, and uploads.

Build forms from the values and server behavior they actually require.

Submission and server rules

Choose a request method, name each value, and make every action explicit.

Labels and choices

Keep controls named and group values according to the decision.

Text and numeric inputs

Match identifiers, quantities, and editing hints to their actual data model.

Dates, ranges, and measured values

Separate display controls from the units and server decisions behind them.

Files and image submissions

Budget bytes, count, content, and the activated submitter.

Common Mistakes

Each lesson explains a browser contract. An illustrative asset or endpoint is not a deployed service until its owner supplies and verifies it.

Curriculum

Choose a request method, name each value, and make every action explicit.

  1. 1HTML forms: choose GET for retrieval and POST for a state change
  2. 2HTML form names and disabled controls: know which values submit
  3. 3HTML constraint validation: improve feedback without trusting the browser
  4. 4HTML form ownership: connect an external submit button deliberately
  5. 5HTML submit overrides: one form, two deliberate destinations
  6. 6HTML button type: make every form action explicit
  7. 7HTML reset button: restore initial form values, not a saved record
  8. 8HTML formnovalidate: save a draft without publishing incomplete data
  9. 9HTML submitter value: identify which button sent the form
  10. 10HTML hidden inputs: carry a token without treating it as secret
  11. 11HTML search form: pair a search landmark with a real GET result route

Keep controls named and group values according to the decision.

  1. 1HTML labels: bind each control to a durable accessible name
  2. 2HTML input types: choose controls from the value contract
  3. 3HTML radio and checkbox controls: submit choices with explicit values
  4. 4HTML select and textarea: preserve meaningful values and editable text
  5. 5HTML fieldset and legend: name a group before its choices
  6. 6HTML disabled fieldset: stop editing without implying saved state
  7. 7HTML optgroup and multiple select: make several choices explicit
  8. 8HTML required select: use an empty first choice when no decision exists

Match identifiers, quantities, and editing hints to their actual data model.

  1. 1HTML autocomplete and inputmode: describe purpose and keyboard hints
  2. 2HTML datalist: offer suggestions without closing the input
  3. 3HTML pattern: validate a field’s syntax without claiming identity
  4. 4HTML length limits: bound user text and explain the stored rule
  5. 5HTML dirname: submit text direction beside the user’s words
  6. 6HTML number or text input: choose by the value, not its digits
  7. 7HTML number boundaries: align min, max, and step with the real unit
  8. 8HTML text input assistance: keyboard hints are not validation
  9. 9HTML multiple email input: parse a list, not a single address
  10. 10HTML telephone input: preserve symbols and validate your own format
  11. 11HTML password autocomplete: distinguish current and new credentials
  12. 12HTML textarea wrap: distinguish display wrapping from submitted line breaks
  13. 13HTML contenteditable versus textarea: choose the data model first

Separate display controls from the units and server decisions behind them.

  1. 1HTML date and time inputs: separate display from submitted values
  2. 2HTML range input: capture an approximate bounded choice
  3. 3HTML color input: collect a preference without making color the message
  4. 4HTML progress, meter, and output: three different value relationships

Budget bytes, count, content, and the activated submitter.

  1. 1HTML file upload forms: declare multipart encoding and bound the server
  2. 2HTML file accept: guide the picker, validate the upload on the server
  3. 3HTML multiple file input: accept several files without inventing a limit
  4. 4HTML image submit button: supply an action name and handle coordinates carefully
  5. 5HTML file capture: suggest a camera without treating it as permission
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