feat: introduce trigger functionality (#27644)

Signed-off-by: lyzno1 <yuanyouhuilyz@gmail.com>
Co-authored-by: Stream <Stream_2@qq.com>
Co-authored-by: lyzno1 <92089059+lyzno1@users.noreply.github.com>
Co-authored-by: zhsama <torvalds@linux.do>
Co-authored-by: Harry <xh001x@hotmail.com>
Co-authored-by: lyzno1 <yuanyouhuilyz@gmail.com>
Co-authored-by: yessenia <yessenia.contact@gmail.com>
Co-authored-by: hjlarry <hjlarry@163.com>
Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>
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Co-authored-by: WTW0313 <twwu@dify.ai>
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web/app/components/workflow/nodes/end/default.ts

@@ -6,17 +6,34 @@ import { BlockEnum } from '@/app/components/workflow/types'
 const metaData = genNodeMetaData({
   sort: 2.1,
   type: BlockEnum.End,
-  isRequired: true,
+  isRequired: false,
 })
 const nodeDefault: NodeDefault<EndNodeType> = {
   metaData,
   defaultValue: {
     outputs: [],
   },
-  checkValid() {
+  checkValid(payload: EndNodeType, t: any) {
+    const outputs = payload.outputs || []
+
+    let errorMessage = ''
+    if (!outputs.length) {
+      errorMessage = t('workflow.errorMsg.fieldRequired', { field: t('workflow.nodes.end.output.variable') })
+    }
+    else {
+      const invalidOutput = outputs.find((output) => {
+        const variableName = output.variable?.trim()
+        const hasSelector = Array.isArray(output.value_selector) && output.value_selector.length > 0
+        return !variableName || !hasSelector
+      })
+
+      if (invalidOutput)
+        errorMessage = t('workflow.errorMsg.fieldRequired', { field: t('workflow.nodes.end.output.variable') })
+    }
+
     return {
-      isValid: true,
-      errorMessage: '',
+      isValid: !errorMessage,
+      errorMessage,
     }
   },
 }

web/app/components/workflow/nodes/end/panel.tsx

@@ -30,6 +30,7 @@ const Panel: FC<NodePanelProps<EndNodeType>> = ({
 
         <Field
           title={t(`${i18nPrefix}.output.variable`)}
+          required
           operations={
             !readOnly ? <AddButton onClick={handleAddVariable} /> : undefined
           }