ErrorBox

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`ErrorBox`

Unsupported in Cloud

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ErrorBox[boxes]

is a low-level box construct that represents boxes that cannot be interpreted in input or output.

Details

ErrorBox[boxes] typically displays as the raw form of boxes together with underlining that indicates parts that cannot be interpreted.
An explicit ErrorBox is typically generated by a failed call to MakeExpression.
When the front end reads an invalid box structure from a Notebook or Cell expression, it generates an implicit ErrorBox, but it preserves the original structure when the expression is written out.
ErrorBox is displayed as a pink box. The pink box may have a tooltip or contents that help to indicate the nature of the error.

Examples

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Basic Examples (2)Summary of the most common use cases

MakeExpression generates ErrorBox structure when incomplete syntax is detected:

In[1]:=1

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https://wolfram.com/xid/0tzv2inq-cyqsxu

Out[1]=1

Displaying the ErrorBox shows a pink box:

In[2]:=2

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https://wolfram.com/xid/0tzv2inq-5wxy92

Out[2]=2

An invalid box argument may generate an ErrorBox:

In[1]:=1

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https://wolfram.com/xid/0tzv2inq-q0ilbs

Out[1]=1

Scope (3)Survey of the scope of standard use cases

An implicit ErrorBox may indicate a bad graphics expression:

In[1]:=1

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https://wolfram.com/xid/0tzv2inq-2zojst

Out[1]=1

An implicit ErrorBox in a control or Dynamic indicates a message during evaluation:

In[1]:=1

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https://wolfram.com/xid/0tzv2inq-ndifak

Out[1]=1

A bad option value on the right-hand side can lead to an implicit ErrorBox:

In[1]:=1

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https://wolfram.com/xid/0tzv2inq-8wfuyg

Out[1]=1

Properties & Relations (2)Properties of the function, and connections to other functions

An ErrorBox generated by the kernel typesetting can be read using NotebookRead:

In[1]:=1

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https://wolfram.com/xid/0tzv2inq-yyak7u

Out[1]=1

In[2]:=2

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https://wolfram.com/xid/0tzv2inq-lo5r3h

Out[2]=2

Erroneous boxes display as an ErrorBox, but NotebookRead mirrors the bad input:

In[1]:=1

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https://wolfram.com/xid/0tzv2inq-l8l93a

Out[1]=1

In[2]:=2

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https://wolfram.com/xid/0tzv2inq-24i5ff

Out[2]=2

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