Added more functions

1 files changed, 16 insertions, 0 deletions

diff --git a/webAO/dom/getIndexFromSelect.ts b/webAO/dom/getIndexFromSelect.ts
new file mode 100644
index 0000000..2f21653
--- /dev/null
+++ b/webAO/dom/getIndexFromSelect.ts
@@ -0,0 +1,16 @@
+/**
+ * Find index of anything in select box.
+ * @param {string} select_box the select element name
+ * @param {string} value the value that need to be compared
+ */
+export function getIndexFromSelect(select_box: string, value: string) {
+    // Find if icon alraedy existed in select box
+    const select_element = <HTMLSelectElement>document.getElementById(select_box);
+    for (let i = 1; i < select_element.length; ++i) {
+        if (select_element.options[i].value === value) {
+            return i;
+        }
+    }
+    return 0;
+}
+window.getIndexFromSelect = getIndexFromSelect;
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