Add and remove options for single choice in the form, and remove one choice

Add and remove options for single choice in the form, and remove one choice

Selection add option and put it in the last item

Html code:

<form><select name="location" id="location"><option value="beijing1">beijing</option><option value="shanghai1">shanghai</option><option value="chengdu1">chengdu</option><option value="changsha1">changsha</option></select></form>

Js Code:

var select=document.forms[0].elements['location'];

Method 1: add a single choice

var newOption=document.createElement('option');var newText=document.createTextNode('guangzhou');newOption.appendChild(newText);newOption.setAttribute('value','guangzhou');select.appendChild(newOption);

Method 2: add a single-choice option. Is it much simpler? haha, but not compatible with IE8 or later versions

var newsOption=new Option('nanchang1','nanchang');select.appendChild(newsOption);

Method 3: add a single consumer to see the best solution, which is convenient and compatible.

var nnewOption=new Option('fengcheng1','fengcheng');select.add(nnewOption,undefined);

Remove option:

Method 1: select. remove (I); // index starts from 0

Method 2: select. options [I] = null;

Method 3: select. removeChild (select. options [I])

The following describes three methods to deselect single-choice radio.

This article depends on jQuery. The first is implemented by jQuery, the second is implemented by JS and DOM.

<! Doctype html> 
The above section describes how to add and remove options for a single sheet in a small editor. I hope it will be helpful to you. If you have any questions, please leave a message and I will reply to you in a timely manner. Thank you very much for your support for the help House website!