1. ## Limit on Increment/Decrement

Good day, everyone! I'm fairly new to the world of JavaScript but was just curious if anyone can help me with a question I have. I have a script right now that lets me increment/decrement the number in a field by one with each mouse click depending on which button they press. I'm curious what I can do to keep the value between 0 and 9. Here is the simple script I'm starting out with.

Code:
```function plusminus(num,boo) {
var val = document.getElementById("num"+num).value;
(boo) ? val++ : val--;
document.getElementById("num"+num).value = val;
}```
It's working very well, but I just need to work the 0-9 limitation into it somehow. If anyone can help me out, it'd be very appreciated. Thanks!

2. Code:
```function plusminus(num,boo) {
var val = document.getElementById("num"+num).value;
(boo) ? val++ : val--;
if(val>9){val=0;}
document.getElementById("num"+num).value = val;
}```

3. Registered User
Join Date
Aug 2009
Posts
593
This limits the number to be between 0-9

Code:
```function plusminus(num, boo) {
var ele = document.getElementById('num' + num);
ele.value = Math.min(Math.max((1 * ele.value) + (boo ? 1 : -1), 0), 9);
}```

4. Nice! I went ahead and added a line to keep it from going negative. Is there a sexier way to do it? Either way, this works and I thank you, rnd_me!

Code:
```function plusminus(num,boo) {
var val = document.getElementById("num"+num).value;
(boo) ? val++ : val--;
if(val>9){val=0;}
if(val<0){val=0;}
document.getElementById("num"+num).value = val;
}```

5. Thanks rnd_me and thraddash! rnd_me, after a slight alteration, yours does exactly what I want. And thraddash, yours does it as is. Thanks to both of you. I always like knowing multiple ways of doing things anyway.

There are currently 1 users browsing this thread. (0 members and 1 guests)

#### Posting Permissions

• You may not post new threads
• You may not post replies
• You may not post attachments
• You may not edit your posts
•

"

"

## X vBulletin 4.2.2 Debug Information

• Page Generation 0.39488 seconds
• Memory Usage 2,872KB
• Queries Executed 15 (?)
Template Usage (33):
• (4)bbcode_code
• (1)footer
• (1)forumjump
• (1)forumrules
• (1)gobutton
• (5)memberaction_dropdown
• (1)navbar
• (1)navbar_moderation
• (1)navbar_noticebit
• (1)navbar_tabs
• (2)option
• (5)postbit
• (5)postbit_onlinestatus
• (5)postbit_wrapper
• (1)spacer_close
• (1)spacer_open
• (1)tagbit_wrapper

Phrase Groups Available (6):
• global
• inlinemod
• postbit
• posting
• reputationlevel
Included Files (26):
• ./global.php
• ./includes/class_bootstrap.php
• ./includes/init.php
• ./includes/class_core.php
• ./includes/config.php
• ./includes/functions.php
• ./includes/class_friendly_url.php
• ./includes/class_hook.php
• ./includes/class_bootstrap_framework.php
• ./vb/vb.php
• ./vb/phrase.php
• ./includes/functions_calendar.php
• ./includes/functions_bigthree.php
• ./includes/class_postbit.php
• ./includes/class_bbcode.php
• ./includes/functions_reputation.php
• ./includes/functions_notice.php
• ./packages/vbattach/attach.php
• ./vb/types.php
• ./vb/cache.php
• ./vb/cache/db.php
• ./vb/cache/observer/db.php
• ./vb/cache/observer.php

Hooks Called (70):
• init_startup
• friendlyurl_resolve_class
• init_startup_session_setup_start
• database_pre_fetch_array
• database_post_fetch_array
• init_startup_session_setup_complete
• global_bootstrap_init_start
• global_bootstrap_init_complete
• cache_permissions
• fetch_foruminfo
• global_state_check
• global_bootstrap_complete
• global_start
• style_fetch
• global_setup_complete
• strip_bbcode
• friendlyurl_clean_fragment
• friendlyurl_geturl
• forumjump
• cache_templates
• cache_templates_process
• template_register_var
• template_render_output
• fetch_template_start
• fetch_template_complete
• parse_templates
• notices_check_start
• notices_noticebit
• process_templates_complete
• friendlyurl_redirect_canonical
• bbcode_fetch_tags
• bbcode_create
• postbit_factory
• postbit_display_start
• postbit_imicons
• bbcode_parse_start
• bbcode_parse_complete_precache
• bbcode_parse_complete
• postbit_display_complete
• memberaction_dropdown
• tag_fetchbit_complete
• forumrules
• navbits
• navbits_complete