web: use generic JS function for updating opt elems

2 files changed, 27 insertions, 16 deletions

diff --git a/web/static/dartboat.js b/web/static/dartboat.js
index 44daabb..4edba8a 100644
--- a/web/static/dartboat.js
+++ b/web/static/dartboat.js
@@ -37,6 +37,10 @@ function elemSetContent(sel, str) {
 	$(UTF8ToString(sel)).textContent = str ? UTF8ToString(str) : '';
 }
 
+function elemSetValue(sel, str) {
+	$(UTF8ToString(sel)).value = str ? UTF8ToString(str) : '';
+}
+
 function elemHasClass(sel, c) {
 	return $(UTF8ToString(sel)).classList.contains(UTF8ToString(c));
 }
@@ -65,15 +69,6 @@ function elemScrollToBottom(sel) {
 	e.scrollTop = e.scrollHeight;
 }
 
-function promptHandle(command, data) {
-	const str_c = toCString(command);
-	const str_d = data && toCString(data);
-	_prompt_handle(str_c, str_d);
-
-	_free(str_c);
-	if (str_d) _free(str_d);
-}
-
 function elemAppendElemv(sel, elemc, elemv, off_ns, off_name, off_content,
 	off_n_attrs, off_attr_names, off_attr_vals) {
 	const target = $(UTF8ToString(sel));
@@ -102,12 +97,13 @@ function elemAppendElemv(sel, elemc, elemv, off_ns, off_name, off_content,
 	}
 }
 
-function updateDelay(val) {
-	$('#delay').value = val;
-}
+function promptHandle(command, data) {
+	const str_c = toCString(command);
+	const str_d = data && toCString(data);
+	_prompt_handle(str_c, str_d);
 
-function updateStdev(val) {
-	$('#stdev').value = parseFloat(val.toFixed(2).slice(0, 4));
+	_free(str_c);
+	if (str_d) _free(str_d);
 }
 
 function setOpt(opt, val, update_opts = true) {
diff --git a/web/web_opts.c b/web/web_opts.c
index 0f37bba..945909f 100644
--- a/web/web_opts.c
+++ b/web/web_opts.c
@@ -3,6 +3,8 @@
 #include "comp.h"
 
 #include <math.h>
+#include <stdio.h>
+#include <string.h>
 
 #include <emscripten/emscripten.h>
 
@@ -11,8 +13,21 @@ int delay_ms = 1000;
 void opts_init()
 {
 	EM_ASM(readOpts());
-	EM_ASM({updateDelay($0)}, delay_ms);
-	EM_ASM({updateStdev($0)}, horizontal_stdev);
+
+	char buf[64];
+	sprintf(buf, "%d", delay_ms);
+	EM_ASM({elemSetValue($0, $1)}, "#delay", buf);
+
+	int len = sprintf(buf, "%4.2f", horizontal_stdev);
+	char *dot = strchr(buf, '.');
+	if (dot) {
+		for (char *ptr = buf + len - 1; ptr >= dot; --ptr) {
+			if (*ptr != '0' && *ptr != '.')
+				break;
+			*ptr = 0;
+		}
+	}
+	EM_ASM({elemSetValue($0, $1)}, "#stdev", buf);
 }
 
 EMSCRIPTEN_KEEPALIVE