JSPM – selector-from-element@1.0.0

Package Exports

selector-from-element

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (selector-from-element) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

How to use:

const sel = require('selector-from-element')

var input = document.createElement('input')
input.name = "password"
let form = document.querySelector('body > form#super-form')
form.appendChild(input)

let selector = sel(input)
selector === '#super-form input[name="password"]'

Full code for this package:

function selectorFromNode (node) {
  if (node.id) {
    return '#' + node.id
  }

  let tag = node.tagName.toLowerCase()

  var special = ''
  if (node.name) {
    special += `[name="${node.name}"]`
  }

  var cls = ''
  if (!special && node.className) {
    cls = node.className.split(/ +/g)
      .map(cls => '.' + cls)
      .join('')
  }

  var pos = ''
  if (!special) {
    var nthoftype = 0
    for (let i = 0; i < node.parentNode.children.length; i++) {
      let child = node.parentNode.children[i]
      if (child.tagName === node.tagName) {
        nthoftype++
      }
      if (node === child) {
        pos = `:nth-of-type(${nthoftype})`
        break
      }
    }
  }

  let sel = tag + special + cls + pos
  if (node.parentNode === document.body) {
    return 'body > ' + sel
  } else {
    return `${selectorFromNode(node.parentNode)} > ${sel}`
  }
}