use html5 attributes for limitation input fields string and number type

jsonform/gadget_json_generated_form_child.js

@@ -940,6 +940,19 @@
           if (type === "number") {
             input.setAttribute("step", "any");
           }
+          if (json_field.multipleOf && json_field.multipleOf >= 0) {
+            input.step = json_field.multipleOf;
+          }
+          if (json_field.minimum &&
+              // step work from min value so we can't
+              // use min if min not multipleOf step
+              !(json_field.multipleOf &&
+              (json_field.minimum % json_field.multipleOf) !== 0)) {
+            input.min = json_field.minimum;
+          }
+          if (json_field.maximum) {
+            input.max = json_field.maximum;
+          }
         } else {
           if (default_value === undefined && typeof json_field.default === "string") {
             input.value = json_field.default;
@@ -948,6 +961,13 @@
           input.type = "text";
           if (json_field.pattern) {
             input.pattern = json_field.pattern;
+          } else if (json_field.minLength) {
+            // minLength absent in html5 so
+            // use pattern for this task
+            input.pattern = ".{" + json_field.minLength + ",}";
+          }
+          if (json_field.maxLength) {
+            input.maxLength = json_field.maxLength;
           }
           if (json_field.format === 'uri') {
             input.type = "url";