@mink @Behat Name all existing fields on page with JS. Workaround against "id|name|label|value missing" error during getPage()->fillField($field, $value).

FeatureContext.php

    /**
     * Differ from Mink as does not have fixStepArgument check
     * Fills in form field with specified id|name|label|value
     * Example: When I fill in "username" with: "bwayne"
     * Example: And I fill in "bwayne" for "username"
     * @When /^(?:|I )fill in field "(?P<field>(?:[^"]|\\")*)" with "(?P<value>(?:[^"]|\\")*)"$/
     * @param $field
     * @param $value
     * @throws \Behat\Mink\Exception\ElementNotFoundException
     */
    public function fillFieldInWebDriver($field, $value)
    {
        $idExists = $this->getSession()->getPage()->findField($field);
        if ($idExists !== null) {
            echo "\n\nField with id|name|label|value - $field - have found!\n\n";
            $this->getSession()->getPage()->fillField($field, $value);
        } else {
            $locator = $this->takeValueFromIniFile('locators', $field);
            echo "\n\nField with locator - $locator - to be located\n\n";
            echo "\n\nField has no name. Let's name it!\n\n";

            $javascript = "(function(){
            var fields = document.getElementsByTagName('input');
            var textareas = document.getElementsByTagName('textarea');
            for (var i = 0; i < fields.length; i++) {
                fields[i].name = 'input_number_' + (i + 1);
            }
            for (var i = 0; i < textareas.length; i++) {
                textareas[i].name = 'textarea_number_' + (i + 1);
            }
            })()
            ";

            $this->getSession()->executeScript($javascript);
            $fieldToHaveId = $this->getSession()->getPage()->find("css", $locator);
            $fieldName = $fieldToHaveId->getAttribute("name");
            echo "\n\nField has new name:  " . $fieldName . "\n\n";


            $this->getSession()->getPage()->fillField($fieldName, $value);
        }
    }