JavaScript _ javascript tips

This article mainly introduces how to determine the number of checkbox selected by multiple selection boxes in a JavaScript form. It involves the traversal and judgment techniques of javascript For the checkbox check box, which has some reference value, for more information about how to use JavaScript to determine the number of checkbox selected by multiple selection boxes in a form, see the example in this article. Share it with you for your reference. The details are as follows:

Here, JavaScript is used to detect and determine the number of checked boxes in the form, that is, the number of checked boxes. In the past, this question was frequently asked by various forums, because the checkbox detection is not as simple as the detection input box, especially when it is used to determine the number of items, we feel that this Js Code is still very useful and everyone is interested in improving it.

Shows the running effect:

The Online Demo address is as follows:

Http://demo.jb51.net/js/2015/js-checkbox-chk-num-codes/

The Code is as follows:

Check the number of multiple selection boxes in the form.