Make tag input nicer with JS (if enabled)HEADmain

1 files changed, 84 insertions, 0 deletions

diff --git a/static/scripts/dynamic_input.js b/static/scripts/dynamic_input.js
new file mode 100644
index 0000000..df1c8fe
--- /dev/null
+++ b/static/scripts/dynamic_input.js
@@ -0,0 +1,84 @@
+"use strict";
+(() => {
+    const outerContainer = document.querySelector("div.tag-input-container");
+    const rawInput = document.createElement("input");
+    const name = outerContainer.querySelector("span#tags-input-name-span").innerText;
+    rawInput.setAttribute("type", "hidden");
+    rawInput.setAttribute("name", name);
+    outerContainer.appendChild(rawInput);
+
+    function parseSpaceSeparatedTags(inp) {
+        const tags = new Set();
+        let tag = ""
+        let escaped = false;
+        for (const c of inp) {
+            switch (c) {
+                case "\\":
+                    if (!escaped) {
+                        escaped = true;
+                        continue;
+                    }
+                case " ":
+                    if (!escaped) {
+                        tags.add(tag);
+                        tag = "";
+                        continue;
+                    }
+            }
+            escaped = false;
+            tag += c;
+        }
+        if (tag) {
+            tags.add(tag);
+        }
+        return Array.from(tags).sort((a, b) => a.localeCompare(b));
+    }
+
+    const dynamicInputContainer = document.createElement("span");
+
+    function createDynamicInput() {
+        const dynamicInput = document.createElement("input");
+        dynamicInput.setAttribute("class", "dynamic-tag-input");
+        // So autocomplete will work
+        dynamicInput.setAttribute("name", "dynamic_tag_input");
+        dynamicInput.addEventListener("input", handleInput);
+        return dynamicInput;
+    };
+
+    function handleInput(e) {
+        const sources = document.querySelectorAll("input.dynamic-tag-input");
+        const lastDynamicInput = sources[sources.length - 1];
+        if (e.currentTarget === lastDynamicInput && e.currentTarget.value) {
+            dynamicInputContainer.appendChild(createDynamicInput());
+        } else if (e.currentTarget === sources[sources.length - 2] && !e.currentTarget.value) {
+            dynamicInputContainer.removeChild(lastDynamicInput);
+        }
+        let serialised = "";
+        for (const [i, source] of sources.entries()) {
+            const tag = source.value;
+            if (!tag) { continue; }
+            if (i > 0) {
+                serialised += " ";
+            }
+            serialised += tag.replaceAll("\\", "\\\\").replaceAll(" ", "\\ ");
+        }
+        rawInput.value = serialised;
+    };
+
+    const firstDynamicInput = createDynamicInput();
+    firstDynamicInput.setAttribute("id", "tags-input");
+    dynamicInputContainer.appendChild(firstDynamicInput);
+
+    const initialValue = outerContainer.querySelector("span#tags-input-initial-value-span").innerText;
+    if (initialValue) {
+        const tags = parseSpaceSeparatedTags(initialValue);
+        let input = dynamicInputContainer.querySelector("input.dynamic-tag-input:last-of-type");
+        for (const tag of tags) {
+            input.value = tag;
+            input = createDynamicInput();
+            dynamicInputContainer.appendChild(input);
+        }
+    }
+
+    outerContainer.appendChild(dynamicInputContainer);
+})();