Can we change a picture in a Google Doc dynamically? - google-apps-script

Question

I am coding a contract application in Google App Script.
It creates a GoogleDoc from a template that include an image of the seller's signature and initials.
As there are five seller, and a dozen different templates, is there a way to change the image of signature and initials?
I have no clues where to start looking for that.
thanks and have a nice day!
Eric
EDIT : I found something about InlineImage in DocumentApp... still looking

Answer 1

Here is a little code which appends a an image in a Google doc. Hope this will give you Idea to get going.
Similar concept I used to make a resume builder application which replaces Profile picture and a signature image
//Make a UI form to upload Image
function doGet() {
var app = UiApp.createApplication();
//Form
var form = app.createFormPanel().setEncoding('multipart/form-data').setId('form');
//Add this form to the application
app.add(form);
//Panel to hold form elements
var panel = app.createVerticalPanel();
//add this panel inside form
form.add(panel);
//Now create form elemnts
var label1 = app.createLabel('Upload Image');
var uploadControl = app.createFileUpload().setName('file').setId('file');
var submitBtn = app.createSubmitButton('Submit');
//Add all these elemnts to the panel
panel.add(label1).add(uploadControl).add(submitBtn);
//Return the application to the service URL
return app;
}
//This function is callend when the form is submitted
function doPost(e){
var fileBlob = e.parameter.file; //This is the image blob if an image is uploded
//Open the document
var doc = DocumentApp.openById('ID OF GOOGLE DOC')//change Id of the document
//get the body of document
var docBody = doc.getActiveSection();
//Append the iamge in document body
docBody.appendImage(fileBlob);
//Save and close the document
doc.saveAndClose();
}