ngx-infinite-scroll/esm2022/lib/services/ngx-ins-utils.mjs

[](https://travis-ci.org/orizens/ngx-infinite-scroll) [](#backers) [![Sponso

export function resolveContainerElement(selector, scrollWindow, defaultElement, fromRoot) {
    const hasWindow = window && !!window.document && window.document.documentElement;
    let container = hasWindow && scrollWindow ? window : defaultElement;
    if (selector) {
        const containerIsString = selector && hasWindow && typeof selector === 'string';
        container = containerIsString
            ? findElement(selector, defaultElement.nativeElement, fromRoot)
            : selector;
        if (!container) {
            throw new Error('ngx-infinite-scroll {resolveContainerElement()}: selector for');
        }
    }
    return container;
}
export function findElement(selector, customRoot, fromRoot) {
    const rootEl = fromRoot ? window.document : customRoot;
    return rootEl.querySelector(selector);
}
export function inputPropChanged(prop) {
    return prop && !prop.firstChange;
}
export function hasWindowDefined() {
    return typeof window !== 'undefined';
}
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