for loop in thymeleaf

问题

How can I do the following (java):

for(int i = 0; i < 81 ; i+=20){
   //Should loop through 5 times!
}

in Thymeleaf?

I've tried this:

<option th:each="i : ${#numbers.sequence( 1, 81/20)}">
   <p th:text="${ i }"></p> <!-- THIS loops 4 times, instead of 5 -->
</option>

The problem is that it is not as accurate as the java piece of code. How to do this?

回答1:

I am assuming this is due to the numbers you are using. For your java code, int i = 0; i < 81 ; i+=20 will return i=0, i=20, i=40, i=60 and i=80

however your following code numbers.sequence( 1, 81/20)} should returns the integers from 1 to 4.05, being 1, 2, 3, and 4.

The first loop returns 5 results for i, therefore runs 5 times. the second returns only 4 results, so runs 4 times. I would suggest running your sequence starting at 0 to return 5 results as desired.

If you wanted your java code to mirror the second code, you should change it to: int i = 1; i < 4.05 ; i+=1

To put it simply, you are running through a loop with different numbers, I suggest changing the second statement to start from 0.

回答2:

use iterStat key word to iterate. Example If you have an Array of String and you are iterating the same using thymeleaf.

<div th:each="str,iterStat : strings">
   <span th:text="${str}"/><!--This will print the index value-->
   <span th:text="${iterStat.index}"/><!--This will print the Index-->
</div> 

回答3:

Add step to your code is quite easy.

#{numbers.sequence(0, 81, 20)}

回答4:

The 1st value is the beginning of count, the 2nd is the maximum value and the 3rd is the incremental value

${#numbers.sequence( 1, 4, 1)}

来源：https://stackoverflow.com/questions/20633118/for-loop-in-thymeleaf