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Link.react.js
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Link.react.js
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import PropTypes from 'prop-types';
import React, {useEffect, useMemo} from 'react';
import {isNil} from 'ramda';
/*
* event polyfill for IE
* https://developer.mozilla.org/en-US/docs/Web/API/CustomEvent/CustomEvent
*/
function CustomEvent(event, params) {
// eslint-disable-next-line no-param-reassign
params = params || {
bubbles: false,
cancelable: false,
// eslint-disable-next-line no-undefined
detail: undefined,
};
const evt = document.createEvent('CustomEvent');
evt.initCustomEvent(
event,
params.bubbles,
params.cancelable,
params.detail
);
return evt;
}
CustomEvent.prototype = window.Event.prototype;
/**
* Link allows you to create a clickable link within a multi-page app.
*
* For links with destinations outside the current app, `html.A` is a better
* component to use.
*/
const Link = props => {
const {
className,
style,
id,
href,
loading_state,
children,
title,
target,
refresh,
setProps,
} = props;
const cleanUrl = window.dash_clientside.clean_url;
const sanitizedUrl = useMemo(() => {
return href ? cleanUrl(href) : undefined;
}, [href]);
const updateLocation = e => {
const hasModifiers = e.metaKey || e.shiftKey || e.altKey || e.ctrlKey;
if (hasModifiers) {
return;
}
if (target !== '_self' && !isNil(target)) {
return;
}
// prevent anchor from updating location
e.preventDefault();
if (refresh) {
window.location = sanitizedUrl;
} else {
window.history.pushState({}, '', sanitizedUrl);
window.dispatchEvent(new CustomEvent('_dashprivate_pushstate'));
}
// scroll back to top
window.scrollTo(0, 0);
};
useEffect(() => {
if (sanitizedUrl && sanitizedUrl !== href) {
setProps({
_dash_error: new Error(`Dangerous link detected:: ${href}`),
});
}
}, [href, sanitizedUrl]);
return (
<a
data-dash-is-loading={
(loading_state && loading_state.is_loading) || undefined
}
id={id}
className={className}
style={style}
href={sanitizedUrl}
onClick={updateLocation}
title={title}
target={target}
>
{isNil(children) ? sanitizedUrl : children}
</a>
);
};
Link.propTypes = {
/**
* The children of this component
*/
children: PropTypes.node,
/**
* The URL of a linked resource.
*/
href: PropTypes.string.isRequired,
/**
* Specifies where to open the link reference.
*/
target: PropTypes.string,
/**
* Controls whether or not the page will refresh when the link is clicked
*/
refresh: PropTypes.bool,
/**
* Adds the title attribute to your link, which can contain supplementary
* information.
*/
title: PropTypes.string,
/**
* Often used with CSS to style elements with common properties.
*/
className: PropTypes.string,
/**
* Defines CSS styles which will override styles previously set.
*/
style: PropTypes.object,
/**
* The ID of this component, used to identify dash components
* in callbacks. The ID needs to be unique across all of the
* components in an app.
*/
id: PropTypes.string,
/**
* Object that holds the loading state object coming from dash-renderer
*/
loading_state: PropTypes.shape({
/**
* Determines if the component is loading or not
*/
is_loading: PropTypes.bool,
/**
* Holds which property is loading
*/
prop_name: PropTypes.string,
/**
* Holds the name of the component that is loading
*/
component_name: PropTypes.string,
}),
setProps: PropTypes.func,
};
Link.defaultProps = {
refresh: false,
};
export default Link;