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

Source: Internet
Author: User

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!

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