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USWDS - File Input: Add functions for enabling/disabling the component programmatically by ConnorDY · Pull Request #3760 · uswds/uswds · GitHub
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USWDS - File Input: Add functions for enabling/disabling the component programmatically #3760

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Merged
thisisdano merged 1 commit into from
Dec 8, 2020
Merged

USWDS - File Input: Add functions for enabling/disabling the component programmatically #3760

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62 changes: 60 additions & 2 deletions src/js/components/file-input.js
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Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,7 @@ const DROPZONE_CLASS = `${PREFIX}-file-input`;
const DROPZONE = `.${DROPZONE_CLASS}`;
const INPUT_CLASS = `${PREFIX}-file-input__input`;
const TARGET_CLASS = `${PREFIX}-file-input__target`;
const INPUT = `.${INPUT_CLASS}`;
const BOX_CLASS = `${PREFIX}-file-input__box`;
const INSTRUCTIONS_CLASS = `${PREFIX}-file-input__instructions`;
const PREVIEW_CLASS = `${PREFIX}-file-input__preview`;
Expand All @@ -27,6 +28,61 @@ const EXCEL_PREVIEW_CLASS = `${GENERIC_PREVIEW_CLASS_NAME}--excel`;
const SPACER_GIF =
"data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7";

/**
* The properties and elements within the file input.
* @typedef {Object} FileInputContext
* @property {HTMLDivElement} dropZoneEl
* @property {HTMLInputElement} inputEl
*/

/**
* Get an object of the properties and elements belonging directly to the given
* file input component.
*
* @param {HTMLElement} el the element within the file input
* @returns {FileInputContext} elements
*/
const getFileInputContext = (el) => {
const dropZoneEl = el.closest(DROPZONE);

if (!dropZoneEl) {
throw new Error(`Element is missing outer ${DROPZONE}`);
}

const inputEl = dropZoneEl.querySelector(INPUT);

return {
dropZoneEl,
inputEl,
};
};

/**
* Disable the file input component
*
* @param {HTMLElement} el An element within the file input component
*/
const disable = (el) => {
const { dropZoneEl, inputEl } = getFileInputContext(el);

inputEl.disabled = true;
dropZoneEl.classList.add(DISABLED_CLASS);
dropZoneEl.setAttribute("aria-disabled", "true");
};

/**
* Enable the file input component
*
* @param {HTMLElement} el An element within the file input component
*/
const enable = (el) => {
const { dropZoneEl, inputEl } = getFileInputContext(el);

inputEl.disabled = false;
dropZoneEl.classList.remove(DISABLED_CLASS);
dropZoneEl.removeAttribute("aria-disabled");
};

/**
* Creates an ID name for each file that strips all invalid characters.
* @param {string} name - name of the file added to file input
Expand Down Expand Up @@ -73,8 +129,7 @@ const buildFileInput = (fileInputEl) => {

// Disabled styling
if (disabled) {
fileInputParent.classList.add(DISABLED_CLASS);
fileInputParent.setAttribute("aria-disabled", "true");
disable(fileInputEl);
}

// Sets instruction test based on whether or not multipe files are accepted
Expand Down Expand Up @@ -309,6 +364,9 @@ const fileInput = behavior(
};
});
},
getFileInputContext,
disable,
enable,
}
);

Expand Down