feat(core dom): Add is_input method.

Add "is_input" to test if a element is of input type.
This is basically the same as $(":input") from Sizzle/jQuery.

Author: thet

src/core/dom.js

@@ -92,6 +92,21 @@ const is_visible = (el) => {
     return el.offsetWidth > 0 && el.offsetHeight > 0;
 };
 
+/**
+ * Test, if a element is a input-type element.
+ *
+ * This is taken from Sizzle/jQuery at:
+ * https://github.com/jquery/sizzle/blob/f2a2412e5e8a5d9edf168ae3b6633ac8e6bd9f2e/src/sizzle.js#L139
+ * https://github.com/jquery/sizzle/blob/f2a2412e5e8a5d9edf168ae3b6633ac8e6bd9f2e/src/sizzle.js#L1773
+ *
+ * @param {Node} el - The DOM node to test.
+ * @returns {Boolean} - True if the element is a input-type element.
+ */
+const is_input = (el) => {
+    const re_input = /^(?:input|select|textarea|button)$/i;
+    return re_input.test(el.nodeName);
+};
+
 /**
  * Return all direct parents of ``el`` matching ``selector``.
  * This matches against all parents but not the element itself.
@@ -322,6 +337,7 @@ const dom = {
     get_parents: get_parents,
     acquire_attribute: acquire_attribute,
     is_visible: is_visible,
+    is_input: is_input,
     create_from_string: create_from_string,
     get_css_value: get_css_value,
     find_scroll_container: find_scroll_container,

src/core/dom.test.js

@@ -444,6 +444,20 @@ describe("core.dom tests", () => {
         });
     });
 
+    describe("is_input", () => {
+        it("checks, if an element is of type input or not.", (done) => {
+            expect(dom.is_input(document.createElement("input"))).toBe(true);
+            expect(dom.is_input(document.createElement("select"))).toBe(true);
+            expect(dom.is_input(document.createElement("textarea"))).toBe(true);
+            expect(dom.is_input(document.createElement("button"))).toBe(true);
+
+            expect(dom.is_input(document.createElement("form"))).toBe(false);
+            expect(dom.is_input(document.createElement("div"))).toBe(false);
+
+            done();
+        });
+    });
+
     describe("create_from_string", () => {
         it("Creates a DOM element from a string", (done) => {
             const res = dom.create_from_string(`