jQuery operation option implementation code_jquery

Clear the option before clearing the option in js. My approach is to traverse the existing option and make each of its child elements empty. Now using jQuery to implement it, we only need to call its supported empty method.

empty()

Delete all child nodes in the matching element set.
In addition, we need to set the default value, so here is the method to clear all options under select, just use the following statement:

Copy code The code is as follows:

$('#selectId').empty().append( $("Put the default value here") );

The previous method of dynamically creating option
with js was to use its intermediate function to traverse the json object returned by Ajax. And use new Option to create option. Now I use the following method to process

Copy code The code is as follows:

for(var i = 0,len = jsondata.length; i$('#selectId').append($("" jsondata[i].txt ""));
}

It seems that it can also be written like this:

Copy code The code is as follows:

$('#selectId').append("" jsondata[i].txt "");