@spec all(html(), HtmlQuery.Css.selector()) :: Floki.html_tree()

Finds all elements in html that match selector, returning a Floki HTML tree.

iex> html = ~s|<select> <option value="a" selected>apples</option> <option value="b">bananas</option> </select>|
iex> HtmlQuery.all(html, "option")
[
  {"option", [{"value", "a"}, {"selected", "selected"}], ["apples"]},
  {"option", [{"value", "b"}], ["bananas"]}
]

@spec attr(html(), attr()) :: binary() | nil

Returns the value of attr from the outermost element of html. If attr is an atom, any underscores are converted to dashes.

iex> html = ~s|<div> <a href="/logout" test-role="logout-link">logout</a> </div>|
iex> HtmlQuery.find!(html, test_role: "logout-link") |> HtmlQuery.attr("href")
"/logout"

@spec find(html(), HtmlQuery.Css.selector()) :: Floki.html_node() | nil

Finds the first element in html that matches selector, returning a Floki HTML node.

iex> html = ~s|<select> <option value="a" selected>apples</option> <option value="b">bananas</option> </select>|
iex> HtmlQuery.find(html, "select option[selected]")
{"option", [{"value", "a"}, {"selected", "selected"}], ["apples"]}

@spec find!(html(), HtmlQuery.Css.selector()) :: Floki.html_node()

Like find/2 but raises unless exactly one element is found.

@spec form_fields(html()) :: %{required(atom()) => binary() | map()}

Returns a map containing the form fields of form selector in html. Because it returns a map, any information about the order of form fields is lost.

iex> html = ~s|<form> <input type="text" name="color" value="green"> <textarea name="desc">A tree</textarea> </form>|
iex> html |> HtmlQuery.find("form") |> HtmlQuery.form_fields()
%{color: "green", desc: "A tree"}

Field names are converted to snake case atoms:

iex> html = ~s|<form> <input type="text" name="favorite-color" value="green"> </form>|
iex> html |> HtmlQuery.find("form") |> HtmlQuery.form_fields()
%{favorite_color: "green"}

If form field names are in foo[bar] format, then foo becomes a key to a nested map containing bar:

iex> html = ~s|<form> <input type="text" name="profile[name]" value="fido"> <input type="text" name="profile[age]" value="10"> </form>|
iex> html |> HtmlQuery.find("form") |> HtmlQuery.form_fields()
%{profile: %{name: "fido", age: "10"}}

If a text field has no value attribute, it will not be returned at all:

iex> html = ~s|<form> <input type="text" name="no-value"> </form>|
iex> html |> HtmlQuery.find("form") |> HtmlQuery.form_fields()
%{}

iex> html = ~s|<form> <input type="text" name="empty-value" value=""> </form>|
iex> html |> HtmlQuery.find("form") |> HtmlQuery.form_fields()
%{empty_value: ""}

iex> html = ~s|<form> <input type="text" name="non-empty-value" value="something"> </form>|
iex> html |> HtmlQuery.find("form") |> HtmlQuery.form_fields()
%{non_empty_value: "something"}

The checked value of a radio button set is returned, or nil is returned if no value is checked:

iex> html = ~s|<form> <input type="radio" name="x" value="1"> <input type="radio" name="x" value="2" checked> </form>|
iex> html |> HtmlQuery.find("form") |> HtmlQuery.form_fields()
%{x: "2"}

iex> html = ~s|<form> <input type="radio" name="x" value="1"> <input type="radio" name="x" value="2"> </form>|
iex> html |> HtmlQuery.find("form") |> HtmlQuery.form_fields()
%{x: nil}

When evaluating checkboxes, the name attribute of the input defines whether or not a term or a list will be returned. A name that ends in [] allows a browser to send multiple values, in which case our form fields will return an array of values. A name that does not end in [] will evaluate to a single value, the last checked value in a list:

iex> html = ~s|<form> <input type="checkbox" name="x" value="1" checked> <input type="checkbox" name="x" value="2" checked> </form>|
iex> html |> HtmlQuery.find("form") |> HtmlQuery.form_fields()
%{x: "2"}

iex> html = ~s|<form> <input type="checkbox" name="x" value="1"> <input type="checkbox" name="x" value="2"> </form>|
iex> html |> HtmlQuery.find("form") |> HtmlQuery.form_fields()
%{x: nil}

iex> html = ~s|<form>
...>   <input type="hidden" name="x" value="false">
...>   <input type="checkbox" name="x" value="true">
...>   <input type="hidden" name="y" value="false">
...>   <input type="checkbox" name="y" checked value="true">
...> </form>|
iex> html |> HtmlQuery.find("form") |> HtmlQuery.form_fields()
%{x: false, y: true}

iex> html = ~s|<form> <input type="checkbox" name="x[]" value="1" checked> <input type="checkbox" name="x[]" value="2" checked> </form>|
iex> html |> HtmlQuery.find("form") |> HtmlQuery.form_fields()
%{x: ["1", "2"]}

iex> html = ~s|<form> <input type="checkbox" name="x[]" value="1"> <input type="checkbox" name="x[]" value="2"> </form>|
iex> html |> HtmlQuery.find("form") |> HtmlQuery.form_fields()
%{x: []}

@spec inspect_html(html(), binary()) :: html()

Prints prettified html with a label, and then returns the original html.

@spec meta_tags(html()) :: [%{required(binary()) => binary()}]

Extracts all the meta tags from html, returning a list of maps.

iex> html = ~s|<head> <meta charset="utf-8"/> <meta http-equiv="X-UA-Compatible" content="IE=edge"/> </head>|
iex> HtmlQuery.meta_tags(html)
[%{"charset" => "utf-8"}, %{"content" => "IE=edge", "http-equiv" => "X-UA-Compatible"}]

@spec normalize(html()) :: binary()

Parses and then re-stringifies html, increasing the liklihood that two equivalent HTML strings can be considered equal.

iex> a = ~s|<p id="color">green</p>|
iex> b = ~s|<p  id = "color" >green</p>|
iex> a == b
false
iex> HtmlQuery.normalize(a) == HtmlQuery.normalize(b)
true

@spec parse(html()) :: Floki.html_tree()

Parses an HTML fragment using Floki.parse_fragment!/1, returning a Floki HTML tree.

@spec parse_doc(html()) :: Floki.html_tree()

Parses an HTML document using Floki.parse_document!/1, returning a Floki HTML tree.

@spec pretty(html()) :: binary()

Returns html as a prettified string (delgates to Floki.raw_html/2 with the pretty: true option).

@spec reject(html(), HtmlQuery.Css.selector()) :: html()

Returns html after removing all nodes that don't match selector (delegates to Floki.filter_out/2).

iex> html = ~s|<div> <span id="name">Alice</span> <span id="password">topaz</span> </div>|
iex> HtmlQuery.reject(html, id: "password") |> HtmlQuery.normalize()
~s|<div><span id="name">Alice</span></div>|

@spec table(
  html(),
  keyword()
) :: [[]] | [map()]

Returns the contents of the table as a list of lists.

Options:

• as - if :lists (the default), returns the table as a list of lists; if :maps, returns the table as a list of maps.
• only - a list of the indices of the columns to return; a list of column headers (as strings) to return, assuming that the first row of the table is the columns names; or :all to return all columns (which is the same as not specifying this option at all).
• except - returns all the columns except the ones whose indices or names are given. only and except can be combined to further reduce the set of columns.
• headers - if true (the default), returns the list of headers along with the rows. Ignored if as option is :map.

Deprecated options:

• columns - use only instead.

iex> html = "<table> <tr><th>A</th><th>B</th><th>C</th></tr> <tr><td>1</td><td>2</td><td>3</td></tr> </table>"
iex> HtmlQuery.table(html)
[
  ["A", "B", "C"],
  ["1", "2", "3"]
]
iex> HtmlQuery.table(html, as: :maps)
[
  %{"A" => "1", "B" => "2", "C" => "3"}
]
iex> HtmlQuery.table(html, only: [0, 2])
[
  ["A", "C"],
  ["1", "3"]
]
iex> HtmlQuery.table(html, only: [2, 0])
[
  ["C", "A"],
  ["3", "1"]
]
iex> HtmlQuery.table(html, only: ["C", "A"])
[
  ["C", "A"],
  ["3", "1"]
]
iex> HtmlQuery.table(html, except: ["C", "A"])
[
  ["B"],
  ["2"]
]
iex> HtmlQuery.table(html, only: ["C", "A"], headers: false)
[
  ["3", "1"]
]

@spec text(html()) :: binary()

Returns the text value of html.

iex> html = ~s|<select> <option value="a" selected>apples</option> <option value="b">bananas</option> </select>|
iex> HtmlQuery.find!(html, "select option[selected]") |> HtmlQuery.text()
"apples"