简体中文(ZH-CN) English(EN) 繁体中文(ZH-TW) 日本語(JA) 한국어(KO) Melayu(MS) Français(FR) Deutsch(DE)
Home > Web Front-end > JS Tutorial > body text

How to implement javascript to pop up a warning box when the check box exceeds the limit_javascript skills

WBOY
Release： 2016-05-16 16:13:11
Original
1456 people have browsed it

The example in this article describes the method of using JavaScript to pop up a warning box when the check box exceeds the limit. Share it with everyone for your reference. The specific implementation method is as follows: 

<html>
<title>javascript实现复选框超过限制即弹出警告框的方法</title>
<body>
<SCRIPT LANGUAGE="JavaScript">
<!--//
function countChoices(obj) {
max = 2;
box1 = obj.form.box1.checked;
box2 = obj.form.box2.checked;
box3 = obj.form.box3.checked;
count = (box1 &#63; 1 : 0) + (box2 &#63; 1 : 0) + (box3 &#63; 1 : 0);
if (count > max) {
alert("对不起，你只能选择" + max + "个项目!");
obj.checked = false;
  }
}
//-->
</script>
   <form name="form">
    请最多选择2个项目： 
    <p> 
     <input type=checkbox name=box1 onClick="countChoices(this)">
     选择项目1
    <p> 
     <input type=checkbox name=box2 onClick="countChoices(this)">
     选择项目2
    <p> 
     <input type=checkbox name=box3 onClick="countChoices(this)">
     选择项目3
    <p> 
   <div>
</div>
</FORM>
</body>
</html>
Copy after login

I hope this article will be helpful to everyone’s JavaScript programming design.

Related labels：
javascript checkbox pop up method exceed the limit
source：php.cn
Previous article：JS method to realize gradient background color when entering the page_javascript skills Next article：JS method to make web page background image move diagonally_javascript skills
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Latest Articles by Author
Latest Issues
CSS only method to dynamically modify image src on click without using JavaScript I need to change the src of an image on mouse click using only css like img:active{}
From 2024-04-06 19:25:49
0
1
505
Scatterplot points do not maintain values ​​when zooming in d3.js This is my first time using d3.js, so please bear with me. I implemented it as pure JavaSc...
From 2024-04-06 18:16:26
0
1
403
JavaScript hover events on vendor-specific pseudo-elements I have the following htmlinput tag. $("input[type='range']::-webkit-slider-thumb"...
From 2024-04-06 15:35:24
0
1
274
Submit form without button using Javascript/Jquery I'm trying to submit a form without a button by calling a JavaScript function and executin...
From 2024-04-06 14:54:03
0
2
421
Customize the appearance of Bootstrap accordion headers using the CollapseDisplay class I want to style the card title of a panel with class collapseshow. In this example, it's t...
From 2024-04-06 12:53:11
0
1
376
Related Topics
More>
Popular Recommendations
Popular Tutorials
More>
Related Tutorials
Popular Recommendations
Latest courses
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template
About us Disclaimer Sitemap
php.cn：Public welfare online PHP training，Help PHP learners grow quickly！