How JavaScript removes multiple items from the listbox simultaneously _javascript tips

To delete multiple items from the list box at the same time, we cannot delete from top to bottom, because the item above is deleted, the index number of the item below will change, so you can only remove it from the bottom, so there is no problem with the index number being messed up.

HTML code

Copy Code code as follows:

<table>
<tr>
<TD align= "center" >
<select id= "Lsbox" name= "Lsbox" size= "ten" multiple>
<option value= "1" >India</option>
<option value= "2" >united states</option>
<option value= "3" >China</option>
<option value= "4" >Italy</option>
<option value= "5" >Germany</option>
<option value= "6" >Canada</option>
<option value= "7" >France</option>
<option value= "8" >united kingdom</option>
</select>
</td>
</tr>
<tr>
<TD align= "center" >
<button onclick= "Listbox_remove (' Lsbox ');" >Delete</button>
<button onclick= "Window.location.reload ();" >Reset</button>
</td>
</tr>
</table>

The JavaScript code is as follows:

Copy Code code as follows:

function Listbox_remove (SourceID) {
Get the ListBox object from ID.
var src = document.getElementById (SourceID);

Iterate through each option of the listbox
for (var count= src.options.length-1; count >= 0; count--) {

If the option is selected, delete the option
if (src.options[count].selected = = True) {

try {
Src.remove (count, null);

catch (Error) {

Src.remove (count);
}
}
}
}

Of course, if you use jquery to delete, that's convenient, a word is done

Copy Code code as follows:

$ ("#sourceId"). Find (' option:selected '). Remove ();