Javascript 以角度打印多个文件

我有多个blob，我正在从中创建blob URL，并使用库显示浏览器的打印预览屏幕

我有

async printDocuments(): Promise<any> {
    const _files: { fileName: string, blob: any }[] = await this._getFiles();
    _files.forEach((_fileInfo, index) => {
        const blobUrl = URL.createObjectURL(_fileInfo.blob);
        printJS(blobUrl);
    });
}

但现在它正在显现

core.js:4196 ERROR Error: Uncaught (in promise): TypeError: params.printable.charAt is not a function
TypeError: params.printable.charAt is not a function

---

onPrintDialogClose

对我来说很有效

这就是我所做的

async printDocuments(): Promise<any> {
     const _files: { fileName: string, blob: any }[] = await this._getFiles();
     if (_files && _files.length > 0) {
            this._printDocument(_files, 0);
     }
}

private _printDocument(files: { fileName: string, blob: any }[], index: number): void {
    const blobUrl = URL.createObjectURL(files[index].blob);
    printJS({
        printable: blobUrl,
        type: "pdf",
        onPrintDialogClose: () => {
            index = index + 1;
            if (index < files.length) {
                this._printDocument(files, index);
            }
        }
    });
}

---

尝试使用库

onPrintDialogClose

，仅在完成第一个打印作业后触发下一个打印作业。浏览器可能会忽略其他作业，因为它们是在处理第一个作业之前触发的@crabbly，更新了问题，你能帮忙吗

async printDocuments(): Promise<any> {
     const _files: { fileName: string, blob: any }[] = await this._getFiles();
     if (_files && _files.length > 0) {
            this._printDocument(_files, 0);
     }
}

private _printDocument(files: { fileName: string, blob: any }[], index: number): void {
    const blobUrl = URL.createObjectURL(files[index].blob);
    printJS({
        printable: blobUrl,
        type: "pdf",
        onPrintDialogClose: () => {
            index = index + 1;
            if (index < files.length) {
                this._printDocument(files, index);
            }
        }
    });
}

// fix : printjs issue #495
const handler = () => {
    // Make sure the event only happens once.
    window.removeEventListener("mouseover", handler);

    // function that you want to execute for onPrintDialogClose
    onCloseCallback();

    // Remove iframe from the DOM, by default 'printJS'
    const iframe = document.getElementById("printJS");

    if (iframe) {
        iframe.remove();
    }
    };
setTimeout(() => { window.addEventListener("mouseover", handler); }, 1000);