Question

175

ThymeLeaf: Not Equal expression in th:if

rated 0 times [ 179] [ 4] / answers: 1 / hits: 23700 / 6 Years ago, tue, july 3, 2018, 12:00:00

Very new to ThymeLeaf, but have encountered a problem on a project I am working on. Getting the following error in the logs:

Exception evaluating SpringEL expression: !searchResults.results.empty

Looking at the offending code it is:

<th:block th:if=${!searchResults.results.empty}>

I assume that the placement of the exclamation mark (!) is incorrect. I have tried:

<th:block th:if=${not searchResults.results.empty}>

But same error evaluating. Can someone help me as to how to negate a check?

Answers

Only authorized users can answer the question. Please sign in first, or register a free account.

janettejordynm

Add To Favorites

Follow

Total Points: 550

Total Questions: 94

Total Answers: 98

Location: Senegal

Member since Fri, Aug 21, 2020

4 Years ago

janettejordynm questions

1 Chunk file upload with axios

Tue, Nov 24, 20, 00:00, 4 Years ago

1 Node unable to find module alias defined in tsconfig and package.json

Thu, Jun 18, 20, 00:00, 4 Years ago

1 How to check if an entered answer is correct with HTML code?

Sat, May 23, 20, 00:00, 4 Years ago

1 Can someone explain this piece of Javascript code?

Mon, Apr 6, 20, 00:00, 4 Years ago

1 AES Encryption/Decryption in Node JS similar to Java

Tue, Feb 18, 20, 00:00, 4 Years ago

View All

answered 6 Years ago dayanaracolleeng · Accepted Answer

Assuming from the code you've pasted, you want to implement a check where Thymeleaf checks for empty value in an Object. For that :---

<div th:if= ${searchResults.results != null}>

OR

 <div th:if= ${searchResults.results != ''}>

Also,
Alternatively What you can do is-- check on your Controller itself whether the object is empty or doesn't have any Value and send the response on your html page and then check as per that response on Thymeleaf, Like this :- - -

1.) Your controller :--

    List ls = //some data from you DAO

    if(ls.isEmpty()){

         model.addAttribute(response, NoData);

    }else{

         model.addAttribute(response, ls);

    }

Then on your Thymeleaf :- - -

<th:block th:if=${response=='NoData'}> No Data Found </th:block>