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Selection

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Represents a set of nodes in a DOM tree.

Selections have a jQuery-compatible API, but with two caveats:

  • CSS and screen layout are not processed, thus calls like css() and offset() are unavailable.
  • DOM trees are read-only, you can't set attributes or otherwise modify nodes.

(Note that the read-only nature of the DOM trees is purely to avoid a maintenance burden on code with seemingly no practical use - if a compelling use case is presented, modification can easily be implemented.)

MethodDescription
Selection.attr(name)Get the value of an attribute for the first element in the Selection.
Selection.children([selector])Get the children of each element in the set of matched elements, optionally filtered by a selector.
Selection.closest(selector)Get the first element that matches the selector by testing the element itself and traversing up through its ancestors
Selection.contents()Get the children of each element in the set of matched elements, including text and comment nodes.
Selection.data([key])Return the value at the named data store for the first element in the set of matched elements.
Selection.each(fn)Iterate and execute a function for each matched element.
Selection.eq(index)Reduce the set of matched elements to the one at the specified index.
Selection.filter(selector)Reduce the set of matched elements to those that match the selector or pass the function's test.
Selection.find(selector)Find the selection descendants, filtered by a selector.
Selection.first()Reduce the set of matched elements to the first in the set.
Selection.get(index)Retrieve the Element (k6/html) matched by the selector
Selection.has(selector)Reduce the set of matched elements to those that have a descendant that matches the selector
Selection.html()Get the HTML contents of the first element in the set of matched elements
Selection.is(selector)Check the current matched set of elements against a selector or element and return true if at least one of these elements matches the given arguments.
Selection.last()Reduce the set of matched elements to the final one in the set.
Selection.map(fn)Pass each element in the current matched set through a function, producing a new Array containing the return values.
Selection.nextAll([selector])Get all following siblings of each element in the set of matched elements, optionally filtered by a selector.
Selection.next([selector])Get the immediately following sibling of each element in the set of matched element
Selection.nextUntil([selector], [filter])Get all following siblings of each element up to but not including the element matched by the selector.
Selection.not(selector)Remove elements from the set of matched elements
Selection.parent([selector])Get the parent of each element in the current set of matched elements, optionally filtered by a selector.
Selection.parents([selector])Get the ancestors of each element in the current set of matched elements, optionally filtered by a selector.
Selection.parentsUntil([selector], [filter])Get the ancestors of each element in the current set of matched elements, up to but not including the element matched by the selector.
Selection.prevAll([selector])Get all preceding siblings of each element in the set of matched elements, optionally filtered by a selector.
Selection.prev([selector])Get the immediately preceding sibling of each element in the set of matched elements.
Selection.prevUntil([selector], [filter])Get all preceding siblings of each element up to but not including the element matched by the selector.
Selection.size()Return the number of elements in the Selection.
Selection.serialize()Encode a set of form elements as a string in standard URL-encoded notation for submission.
Selection.serializeArray()Encode a set of form elements as an array of names and values.
Selection.serializeObject()Encode a set of form elements as an object.
Selection.slice(start [, end])Reduce the set of matched elements to a subset specified by a range of indices.
Selection.text()Get the text content of the selection.
Selection.toArray()Retrieve all the elements contained in the Selection, as an array.
Selection.val()Get the current value of the first element in the set of matched elements.

Example

import { parseHTML } from 'k6/html';
import http from 'k6/http';

export default function () {
  const res = http.get('https://k6.io');
  const doc = parseHTML(res.body);
  const pageTitle = doc.find('head title').text();
  const langAttr = doc.find('html').attr('lang');
}