CODEWITHSUNDEEP
javascriptgoogle-apps-scriptgoogle-docs
Leonardo Silva
Leonardo Silva

Reputation: 381

Exception when trying to retrieve child elements of paragraphs in google apps script

I have been trying to deal with the set of images in a document using google apps script. I manage to do what I want, which is to take the images from my document and place them inside a table with two lines and a column, where the first line contains a space for the image description and the second contains the image itself. However, I am having difficulties when going through the paragraphs of my document, my script finds a paragraph without children. This has generated a runtime exception as follows: Exception: The child index (0) must be less than the number of child elements (0). I tried to handle this with an if (), but when I reach the empty paragraph, the same exception is thrown. The code of my script follows below:

function manipuleImage(){
  var doc = DocumentApp.getActiveDocument();
  var body = doc.getBody();
  var paragraphs = body.getParagraphs();
  
  var imagens = body.getImages();
  var image = imagens[0];
  var typeImage = image.getType();

  for(var i = 0; i < paragraphs.length; i++){

    var paragraph = paragraphs[i];
    
     if(paragraph.getChild(0) != 0){
      var child = paragraph.getChild(0);
      var typeChild = child.getType();
    
      if(typeChild == "INLINE_IMAGE"){
      
         var cells = [
           [''],['']
         ]; 
  
         var styleCell = {};
         styleCell[DocumentApp.Attribute.FONT_SIZE] = 11;
         styleCell[DocumentApp.Attribute.BOLD] = true;
         styleCell[DocumentApp.Attribute.FOREGROUND_COLOR] = '#ffffff';
         styleCell[DocumentApp.Attribute.FONT_FAMILY]='Roboto';
         styleCell[DocumentApp.Attribute.VERTICAL_ALIGNMENT] = DocumentApp.VerticalAlignment.CENTER;
         styleCell[DocumentApp.Attribute.HORIZONTAL_ALIGNMENT] = DocumentApp.HorizontalAlignment.CENTER;
  
       var tableImage = body.insertTable(i, cells)
       tableImage.getRow(0).getCell(0).setBackgroundColor("#ef5350");
       tableImage.setBorderColor("#ef5350");
       tableImage.setBorderWidth(1);
       tableImage.getRow(0).getCell(0).setAttributes(styleCell);
       tableImage.getRow(1).getCell(0).setAttributes(styleCell);
       tableImage.getRow(0).getCell(0).setTextAlignment(DocumentApp.TextAlignment.NORMAL);
       tableImage.getRow(1).getCell(0).setTextAlignment(DocumentApp.TextAlignment.NORMAL);
  
       var appendImage = tableImage.getRow(1).getCell(0).clear().appendImage(child.getBlob());
      
       var index = i + 1;
  
       body.removeChild(body.getChild(index));
  
       var imageH = appendImage.getHeight() / 2;
       var imageW = appendImage.getWidth() / 2;
    
       appendImage.setHeight(imageH).setWidth(imageW);
     }
    }
  }
}

Upvotes: 1

Views: 835

Answers (1)

Tanaike
Tanaike

Reputation: 201513

How about this modification?

Modification points:

  • getChild(childIndex) returns Element object. Please be careful this.
  • In this case, I think that when the paragraph is only line break, the error occurs. I think that the reason of your issue might be this.

If you want to skip the paragraph which has only the line break, how about ths following modification?

Modified script:

When your script is modified, please modify as follows.

From: 
if(paragraph.getChild(0) != 0){
To: 
if(paragraph.getNumChildren() != 0){

References:

Upvotes: 1

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