Created
November 1, 2017 12:39
-
-
Save redknitin/276198997b9b7d59013a9024c7037219 to your computer and use it in GitHub Desktop.
Cascading dropdowns in HTML-JS with static data
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| <!-- | |
| Name: Cascading Dropdowns for Static Data | |
| Description: Provide a dictionary object using JSON and the pair of dropdowns to link together | |
| Author: Nitin | |
| --> | |
| <!doctype html><html><head> | |
| <script> | |
| function ddlpopulate(ddl, arr) { | |
| ddl.options.length = 0; | |
| iteropt = document.createElement('option'); | |
| iteropt.innerHTML = iteropt.value = ''; | |
| ddl.appendChild(iteropt); | |
| for (i=0; i<arr.length; i++) { | |
| iteropt = document.createElement('option'); | |
| iteropt.innerHTML = iteropt.value = arr[i]; //.text | |
| ddl.appendChild(iteropt); | |
| } | |
| } | |
| function ddlcascade(upper, lower, ht) { | |
| objUpper = document.getElementById(upper); | |
| objLower = document.getElementById(lower); | |
| if (objUpper.options.length == 0) { | |
| ddlpopulate(objUpper, Object.keys(ht)); | |
| } | |
| objUpper.onchange = function() { | |
| ddlpopulate(objLower, ht[objUpper.value]); | |
| } | |
| } | |
| //If using jQuery, use $(document).ready, or find and call other onload handlers | |
| window.onload = function() { | |
| hyper01 = { 'nose' : ['N-X', 'N-L', 'N-M', 'N-S'], 'lips' : ['L-STD'], 'ear': ['E-L', 'E-S'] }; | |
| ddlcascade('ddl01', 'ddl02', hyper01); | |
| } | |
| </script> | |
| </head><body> | |
| <form> | |
| <select id="ddl01"> | |
| </select> | |
| <select id="ddl02"> | |
| </select> | |
| </form> | |
| </body></html> |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment