Home > Developer > JavaScript

JavaScript check checkbox checkbox is checked

Source: Internet
Author: User
Developer on Alibaba Coud: Build your first app with APIs, SDKs, and tutorials on the Alibaba Cloud. Read more ＞

Let's say there's a checkbox named CheckBox1 on the Web page with a form,form named Form1.

The code is as follows Copy Code

var f = document.form1;
var sum=0;
if (f.checkbox1.length) {
for (var i=0;i <f.checkbox1.length;i++) {
if (f.checkbox1[i].checked==true)
sum=sum+1;
}
}else{
if (f.checkbox1.checked) {
Sum=1;
}
}
Console.log (sum);

Note that the outermost if judgment, f.checkbox1.length returns undefined when there is only one checkbox item.

Look at one more.

The code is as follows Copy Code

<script>
function test ()
{
var x=document.getelementsbyname ("enjoy[]");
var Issel=false;
for (Var i=0;i<x.length;i++)
{
if (x[i].checked)
{
Issel=true;
return Issel;
}
}
return Issel;
}
</script>
<body>
<form id= "Form1" Name= "Form1" method= "Post" action= "" >

<input type= "checkbox" Name= "enjoy[]" id= "enjoy["/>
Eat
<input type= "checkbox" Name= "enjoy[]" id= "enjoy["/>
Drink

<input type= "Submit" name= "button" id= "button" onclick= "Alert (Test ());" value= "Submit"/>
</form>

Get to the selected checkbox there are several, the next operation will not be more introduced it.

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

Related Keywords:
checkbox php checked php set checkbox checked checkbox checked php code php checkbox checked asp checkbox checked php checkbox checked from database multiple checkbox checked in php
Related Article
JavaScript solution to the eight Queens Problem method summar...
The difference between single and double quotes in JavaScript...
Http status code: 301, 302 redirection, 302 redirection
The html space symbol nbsp; ensp; emsp; introduces and implem...
Ajax and 302 response code Testing
Ajax and 302 response code test_javascript-js tutorial

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

What's Trending
Top 10 Tags
datastax versions naming convention zookeeper client class definition md5 microsoft sql server 2005 data structures exception handling error handling
Top 10 Keywords
microsoft download center down wordpress address url site address url wordpress address url windows installer 4 0 download 302 not found web address url definition site address url wordpress db2 integer mac os installation step by step pdf abbreviation for return

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

Get Started for Free

  • Sales Support

    1 on 1 presale consultation

    Chat Contact Sales

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

    Open a Ticket

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.

    Learn More