private injectCodeFromPayload()

in templates/visuals/rhtml/src/visual.ts [123:169]
33 lines of code
11 McCabe index (conditional complexity)

    private injectCodeFromPayload(payloadBase64: string): void {
        // inject HTML from payload, created in R
        // the code is injected to the 'head' and 'body' sections.
        // if the visual was already rendered, the previous DOM elements are cleared

        resetInjector();

        if (!payloadBase64) {
            return;
        }

        // create 'virtual' HTML, so parsing is easier
        let el: HTMLHtmlElement = document.createElement("html");
        try {
            // tslint:disable-next-line
            el.innerHTML = window.atob(payloadBase64);
        } catch (err) {
            return;
        }

        // if 'updateHTMLHead == false', then the code updates the header data only on the 1st rendering
        // this option allows loading and parsing of large and recurring scripts only once.
        if (updateHTMLHead || this.headNodes.length === 0) {
            while (this.headNodes.length > 0) {
                let tempNode: Node = this.headNodes.pop();
                document.head.removeChild(tempNode);
            }
            let headList: HTMLCollectionOf<HTMLHeadElement> = el.getElementsByTagName("head");
            if (headList && headList.length > 0) {
                let head: HTMLHeadElement = headList[0];
                this.headNodes = parseElement(head, document.head);
            }
        }

        // update 'body' nodes, under the rootElement
        while (this.bodyNodes.length > 0) {
            let tempNode: Node = this.bodyNodes.pop();
            this.rootElement.removeChild(tempNode);
        }
        let bodyList: HTMLCollectionOf<HTMLBodyElement> = el.getElementsByTagName("body");
        if (bodyList && bodyList.length > 0) {
            let body: HTMLBodyElement = bodyList[0];
            this.bodyNodes = parseElement(body, this.rootElement);
        }

        runHTMLWidgetRenderer();
    }