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Cómo obtener solo texto base64 en angular

Tengo un componente de carga de archivos angulares, donde quiero obtener el base64 y guardarlo. Hasta ahora funciona, pero mi base64 comienza así:

"datos:aplicación/pdf;base64,JVBERi0xLjQKJfbk/N8KM......"

¿Existe de todos modos para obtener solo el código y no los datos: aplicación/pdf; base64, etc.

Aquí está mi código:

 uploadFile(files: FileList | null): void { if(files){ const file = files.item(0) const reader = new FileReader() reader.readAsDataURL(file) reader.onload = () => { this.documentsArray.push({documentType: this.form.controls.dokumentType.value, fileBase64: reader.result,fileName: file.name}) console.log(this.documentsArray) } } }
about 4 years ago · Juan Pablo Isaza
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