Google Apps Script

Class Equation

An element representing a mathematical expression. An Equation may contain EquationFunction, EquationSymbol, and Text elements. For more information on document structure, see the guide to extending Google Docs.

Methods

MethodReturn typeBrief description
clear()EquationClears the contents of the element.
copy()EquationReturns a detached, deep copy of the current element.
editAsText()TextObtains a Text version of the current element, for editing.
findElement(elementType)RangeElementSearches the contents of the element for a descendant of the specified type.
findElement(elementType, from)RangeElementSearches the contents of the element for a descendant of the specified type, starting from the specified RangeElement.
findText(searchPattern)RangeElementSearches the contents of the element for the specified text pattern using regular expressions.
findText(searchPattern, from)RangeElementSearches the contents of the element for the specified text pattern, starting from a given search result.
getAttributes()ObjectRetrieves the element's attributes.
getChild(childIndex)ElementRetrieves the child element at the specified child index.
getChildIndex(child)IntegerRetrieves the child index for the specified child element.
getLinkUrl()StringRetrieves the link url.
getNextSibling()ElementRetrieves the element's next sibling element.
getNumChildren()IntegerRetrieves the number of children.
getParent()ContainerElementRetrieves the element's parent element.
getPreviousSibling()ElementRetrieves the element's previous sibling element.
getText()StringRetrieves the contents of the element as a text string.
getType()ElementTypeRetrieves the element's ElementType.
isAtDocumentEnd()BooleanDetermines whether the element is at the end of the Document.
merge()EquationMerges the element with the preceding sibling of the same type.
removeFromParent()EquationRemoves the element from its parent.
replaceText(searchPattern, replacement)ElementReplaces all occurrences of a given text pattern with a given replacement string, using regular expressions.
setAttributes(attributes)EquationSets the element's attributes.
setLinkUrl(url)EquationSets the link url.

Detailed documentation

clear()

Clears the contents of the element.

Return

Equation — the current element


copy()

Returns a detached, deep copy of the current element.

Any child elements present in the element are also copied. The new element will not have a parent.

Return

Equation — the new copy


editAsText()

Obtains a Text version of the current element, for editing.

Use editAsText for manipulating the elements contents as rich text. The editAsText mode ignores non-text elements (such as InlineImage and HorizontalRule).

Child elements fully contained within a deleted text range are removed from the element.

 
var body = DocumentApp.getActiveDocument().getBody();

 // Insert two paragraphs separated by a paragraph containing an
 // horizontal rule.
 body.insertParagraph(0, "An editAsText sample.");
 body.insertHorizontalRule(0);
 body.insertParagraph(0, "An example.");

 // Delete " sample.\n\n An" removing the horizontal rule in the process.
 body.editAsText().deleteText(14, 25);
 

Return

Text — a text version of the current element


findElement(elementType)

Searches the contents of the element for a descendant of the specified type.

Parameters

NameTypeDescription
elementTypeElementTypethe type of element to search for

Return

RangeElement — a search result indicating the position of the search element


findElement(elementType, from)

Searches the contents of the element for a descendant of the specified type, starting from the specified RangeElement.

 
// Get the body section of the active document.
 var body = DocumentApp.getActiveDocument().getBody();

 // Define the search parameters.
 var searchType = DocumentApp.ElementType.PARAGRAPH;
 var searchHeading = DocumentApp.ParagraphHeading.HEADING1;
 var searchResult = null;

 // Search until the paragraph is found.
 while (searchResult = body.findElement(searchType, searchResult)) {
   var par = searchResult.getElement().asParagraph();
   if (par.getHeading() == searchHeading) {
     // Found one, update and stop.
     par.setText('This is the first header.');
     return;
   }
 }
 

Parameters

NameTypeDescription
elementTypeElementTypethe type of element to search for
fromRangeElementthe search result to search from

Return

RangeElement — a search result indicating the next position of the search element


findText(searchPattern)

Searches the contents of the element for the specified text pattern using regular expressions.

A subset of the JavaScript regular expression features are not fully supported, such as capture groups and mode modifiers.

The provided regular expression pattern is independently matched against each text block contained in the current element.

Parameters

NameTypeDescription
searchPatternStringthe pattern to search for

Return

RangeElement — a search result indicating the position of the search text, or null if there is no match


findText(searchPattern, from)

Searches the contents of the element for the specified text pattern, starting from a given search result.

A subset of the JavaScript regular expression features are not fully supported, such as capture groups and mode modifiers.

The provided regular expression pattern is independently matched against each text block contained in the current element.

Parameters

NameTypeDescription
searchPatternStringthe pattern to search for
fromRangeElementthe search result to search from

Return

RangeElement — a search result indicating the next position of the search text, or null if there is no match


getAttributes()

Retrieves the element's attributes.

The result is an object containing a property for each valid element attribute where each property name corresponds to an item in the DocumentApp.Attribute enumeration.

 
var body = DocumentApp.getActiveDocument().getBody();

 // Append a styled paragraph.
 var par = body.appendParagraph('A bold, italicized paragraph.');
 par.setBold(true);
 par.setItalic(true);

 // Retrieve the paragraph's attributes.
 var atts = par.getAttributes();

 // Log the paragraph attributes.
 for (var att in atts) {
   Logger.log(att + ":" + atts[att]);
 }
 

Return

Object — the element's attributes


getChild(childIndex)

Retrieves the child element at the specified child index.

 
// Get the body section of the active document.
 var body = DocumentApp.getActiveDocument().getBody();

 // Obtain the first element in the document.
 var firstChild = body.getChild(0);

 // If it's a paragraph, set its contents.
 if (firstChild.getType() == DocumentApp.ElementType.PARAGRAPH) {
   firstChild.asParagraph().setText("This is the first paragraph.");
 }
 

Parameters

NameTypeDescription
childIndexIntegerthe index of the child element to retrieve

Return

Element — the child element at the specified index


getChildIndex(child)

Retrieves the child index for the specified child element.

Parameters

NameTypeDescription
childElementthe child element for which to retrieve the index

Return

Integer — the child index


getLinkUrl()

Retrieves the link url.

Return

String — the link url, or null if the element contains multiple values for this attribute


getNextSibling()

Retrieves the element's next sibling element.

The next sibling has the same parent and follows the current element.

Return

Element — the next sibling element


getNumChildren()

Retrieves the number of children.

 
// Get the body section of the active document.
 var body = DocumentApp.getActiveDocument().getBody();

 // Log the number of elements in the document.
 Logger.log("There are " + body.getNumChildren() +
     " elements in the document body.");
 

Return

Integer — the number of children


getParent()

Retrieves the element's parent element.

The parent element contains the current element.

Return

ContainerElement — the parent element


getPreviousSibling()

Retrieves the element's previous sibling element.

The previous sibling has the same parent and precedes the current element.

Return

Element — the previous sibling element


getText()

Retrieves the contents of the element as a text string.

Return

String — the contents of the element as text string


getType()

Retrieves the element's ElementType.

Use getType() to determine the exact type of a given element.

 
var body = DocumentApp.getActiveDocument().getBody();

 // Obtain the first element in the document body.

 var firstChild = body.getChild(0);

 // Use getType() to determine the element's type.
 if (firstChild.getType() == DocumentApp.ElementType.PARAGRAPH) {
   Logger.log('The first element is a paragraph.');
 } else {
   Logger.log('The first element is not a paragraph.');
 }
 

Return

ElementType — the element type


isAtDocumentEnd()

Determines whether the element is at the end of the Document.

Return

Boolean — whether the element is at the end of the document


merge()

Merges the element with the preceding sibling of the same type.

Only elements of the same ElementType may be merged. Any child elements contained in the current element are moved to the preceding sibling element.

The current element is removed from the document.

 
var body = DocumentApp.getActiveDocument().getBody();

 // Append two paragraphs to the document.
 var par1 = body.appendParagraph('Paragraph 1.');
 var par2 = body.appendParagraph('Paragraph 2.');

 // Merge the newly added paragraphs into a single paragraph.
 par2.merge();
 

Return

Equation — the merged element


removeFromParent()

Removes the element from its parent.

 
var body = DocumentApp.getActiveDocument().getBody();

 // Remove all images in the document body.
 var imgs = body.getImages();
 for (var i = 0; i < imgs.length; i++) {
   imgs[i].removeFromParent();
 }
 

Return

Equation — the removed element


replaceText(searchPattern, replacement)

Replaces all occurrences of a given text pattern with a given replacement string, using regular expressions.

A subset of the JavaScript regular expression features are not fully supported, such as capture groups and mode modifiers.

The provided regular expression pattern is independently matched against each text block contained in the current element.

 
var body = DocumentApp.getActiveDocument().getBody();

 // Clear the text surrounding "Apps Script", with or without text.
 body.replaceText("^.*Apps ?Script.*$", "Apps Script");
 

Parameters

NameTypeDescription
searchPatternStringthe regex pattern to search for
replacementStringthe text to use as replacement

Return

Element — the current element


setAttributes(attributes)

Sets the element's attributes.

The specified attributes parameter must be an object where each property name is an item in the DocumentApp.Attribute enumeration and each property value is the new value to be applied.

 
var body = DocumentApp.getActiveDocument().getBody();

 // Define a custom paragraph style.
 var style = {};
 style[DocumentApp.Attribute.HORIZONTAL_ALIGNMENT] =
     DocumentApp.HorizontalAlignment.RIGHT;
 style[DocumentApp.Attribute.FONT_FAMILY] =
     DocumentApp.FontFamily.CALIBRI;
 style[DocumentApp.Attribute.FONT_SIZE] = 18;
 style[DocumentApp.Attribute.BOLD] = true;

 // Append a plain paragraph.
 var par = body.appendParagraph('A paragraph with custom style.');

 // Apply the custom style.
 par.setAttributes(style);
 

Parameters

NameTypeDescription
attributesObjectthe element's attributes

Return

Equation — the current element


setLinkUrl(url)

Sets the link url.

Parameters

NameTypeDescription
urlStringthe link url

Return

Equation — the current element

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