Needs to print data in JSON format using wicket and javascript

Question

The following code I have implemented in the wicket. It is printing the entire JSON data in a single line. Actually it should print in a JSON format. As of my understanding, the problem is with document.getElementById(''demo'').innerHTML={0}. Please correct my code if I did anything wrong.

And why (''demo'') is expecting two single quotes at starting and ending of Html id.

target.appendJavaScript(MessageFormat
                    .format("document.getElementById(''demo'').innerHTML={0}'", mapper.writerWithDefaultPrettyPrinter()
                                    .writeValueAsString(jsonDataProducer())));

Maybe I'm misunderstanding, but JSON data is always in JSON format. — user47589
– user47589, Commented Sep 18, 2019 at 14:20
yes, it is in JSON format only. I'm asking for pretty print format. Not like entire JSON data printing in a single line. — Krishna
– Krishna, Commented Sep 18, 2019 at 14:24
I don't understand why you use two single quotes with getElementById. And 'demo' should correspond to a <pre> tag if you want to display the prettified JSON — Andrea Del Bene
– Andrea Del Bene, Commented Sep 18, 2019 at 14:28
@Andrea Del Bene sorry for the delay. In MessageFormat "A single quote itself must be represented by doubled single quotes ''. I got this from following link: stackoverflow.com/questions/189889/… — Krishna
– Krishna, Commented Sep 20, 2019 at 12:55

Krishna · Accepted Answer · 2019-09-20 13:15:15Z

1

I got answer to my question.

target.appendJavaScript(MessageFormat
                        .format("document.getElementById(''demo'').innerHTML=JSON.stringify({0},null,2);", jsonDataProducer));

First I tried to print the pretty JSON with the following code. mapper.writerWithDefaultPrettyPrinter().writeValueAsString(jsonDataProducer().toString()) But, javascript is taking it as a object When I assign it to the document.getElementById(''demo'').innerHTML. So, I used JSON.stringify({0},null,2). It will stringify the javascript object in prettified JSON format.

And in MessageFormat a pair of single quotes are treated as a single quote. From here I got MessageFormat single quote information. We can also read MessageFormat documentation.

edited Sep 20, 2019 at 13:15

answered Sep 20, 2019 at 13:08

Krishna

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