In Qute, is it possible to accumulate variables using a for loop before outputting the result? #52213
Replies: 2 comments 2 replies
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\CC @mkouba |
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Yes, this will not work and it's expected because the local variables are not available outside the Also note that Like I said in https://github.com/quarkusio/quarkus/discussaons/51053#discussioncomment-15095982 I would not recommend to do calculations in Qute templates. Qute was originally designed to contain minimal logic and computations should be performed in the Java code. We could try to find a workaround though... |
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Ok, so this is the first thing that that came to mind: package org.acme.qute;
import java.util.concurrent.atomic.LongAdder;
import io.quarkus.qute.TemplateContents;
import io.quarkus.qute.TemplateData;
import io.quarkus.qute.TemplateInstance;
import jakarta.ws.rs.GET;
import jakarta.ws.rs.Path;
import jakarta.ws.rs.Produces;
import jakarta.ws.rs.core.MediaType;
@Path("/sum")
public class SumResource {
@GET
@Produces(MediaType.TEXT_HTML)
public TemplateInstance get() {
return new sum();
}
@TemplateContents(value = """
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Sum example</title>
</head>
<body>
{#let sum = Sum:create}
{#for i in 5}
{sum.add(i)}
{/for}
{sum.get}
{/let}
</body>
</html>
""")
public record sum() implements TemplateInstance {
}
@TemplateData(namespace = "Sum")
public static class Sum {
public static Sum create() {
return new Sum();
}
private final LongAdder adder = new LongAdder();
public String add(int val) {
adder.add(val);
// we need to return string
// because it's used in an output expression
return "";
}
public long get() {
return adder.sum();
}
}
} |
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CC @LiuBo-keep |
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In my work, there's a template configuration that needs to perform an accumulation calculation on a variable, then add the result and output it. However, it doesn't seem to be working. Below is a demo I've written so far.
{#let sum = 0} {#for i in items} {#set sum = sum + i} {/for} {sum} {/let}How can I implement this logical calculation?
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