jquery code to dynamically obtain the number of selected checkboxes_jquery

Today I encountered "jquery dynamically obtains the number of selected checkboxes", first look at the following example:

Copy code The code is as follows:

python

java

jquery

phpddt.com


<script> <br>$(function(){ <br>$("input[type='checkbox']").bind("click ",function(){alert($("input[type='checkbox'][checked='checked']").length);}); <br>}); <br></script>

I bound a click event to the checkbox and wanted to get the number of selected items. The above method failed to obtain it. When I clicked another checkbox, the number remained unchanged:

Copy code The code is as follows:

<script> <br>$( function(){ <br>$("input[type='checkbox']").bind("click",function(){alert($("input[type='checkbox']:checked").length );}); <br>}); <br></script>