code is not working not getting what to do

> what should I do

Recreate it on your own site with fake data and post a link to the page for us to look at.

The issue with the sample was due to a change in the way that bootstrap-select plugin renders its markup. In the version that the sample was based on the <select> was placed outside the .bootstrap-select container. With the later version of the plugin the <select> was relocated inside the .bootstrap-select container. To accommodate the change requires changing this line

var p=$(t).closest('.bootstrap-select').prev();

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To

var p=$(t).closest('.bootstrap-select').find('select');

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I have updated the sample.

Thanks to Eric for pointing out the issue and suggesting a solution

This seems to resolve the issue. There are differences in the library versions that cause the inconsistency in the original code's behavior.