Cascading Drop Downs for Choice and Lookup Columns For a custom list

We can implement Cascading drop downs if we need to change the options or value of a column dynamically based on the selection from a Parent column. Below are code examples.

Cascading Drop Down Code for Lookup columns:

Provide your inputs in the below code.

<script src="/sites/…/jquery-1.4.2.min.js" type=text/javascript></script> <script src="/sites/…/jquery.SPServices-0.5.2.min.js" type=text/javascript></script> <script type="text/javascript"> // Execute the following JavaScript after the page has fully loaded, when it's ".ready" $(document).ready(function(){     $().SPServices.SPCascadeDropdowns({         relationshipList: "Display Name of Master List",         relationshipListParentColumn: "Parent Column Internal Name from Master List",         relationshipListChildColumn: "Child Column Internal Name from Master List",         relationshipListSortColumn: "Sorting Columns Internal Name from Master List",         parentColumn: "Parent Column Display Name from List/Library",         childColumn: "Child Column Display Name from List/Library"     });   }); </script>

Cascading Drop Down Code for Choice columns:
Note: This is using a slightly altered jquery.spservices library that I have attached. Also this example is for a two level cascading drop down code.

<script src="/sites/…/jquery-1.3.2.js" type=text/javascript></script> <script src="/sites/…/jquery.SPServices-0.5.2.min.js" type=text/javascript></script> <script type="text/javascript"> // Execute the following JavaScript after the page has fully loaded, when it's ".ready" $(document).ready(function(){    //Save existing values of Discipline Code and Document Type. The values are lost when cascading code runs.     var VariableName1 = $("select[title='Display Name of Parent Column in List/Library']").val();     var VariableName2 = $("select[title='Display Name of Child Column in List/Library']").val();     // Cascade Dropdowns     $().SPServices.SPCascadeDropdowns({         relationshipList: "Display Name of Master List 1",         relationshipListParentColumn: "Internal Name of Parent Column in Master List 1",         relationshipListChildColumn: "Internal Name of Parent Column in Master List 1",         parentColumn: "Display Name of Parent Column in List/Library",         childColumn: "Display Name of Child Column in List/Library"     });     $().SPServices.SPCascadeDropdowns({         relationshipList: "Internal Name of Master List 2",         relationshipListParentColumn: "Internal Name of Parent Column in Master List 2",         relationshipListChildColumn: "Internal Name of Child Column in Master List 2",         relationshipListSortColumn: "Internal Name of Sorting Column in Master List 2",         parentColumn: "Display Name of Parent Column in List/Library",         childColumn: "Display Name of Child Column in List/Library"     });         // Reset the Discipline Code to its original value before cascading code ran         $("select[title='Display Name of Parent Column in List/Lbrary']").val(VariableName1);                  // trigger the change event so the cascading code runs again         $("select[title='Display Name of Parent Column in List/Library']").trigger('change');         // reset the Document Type to its original value                                 $("select[title='Display Name of Child Column in List/Library']").val(VariableName2);      }); </script>