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This article introduces the relevant knowledge of "how to use XMLHTTP to achieve two-level connected Select". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Using XMLHTTP. We can achieve a lot of good ideas.

This article. Realize the two-level linkage Select.

The traditional two-level linkage is to send all the data to the client..

Using XMLHTTP. We can return the data we need in real time.

Select.htm

The code is as follows:

Function GetResult (str)

{

/ *

*-GetResult (str)-

* GetResult (str)

* function: send a request through XMLHTTP and return the result.

* parameters: str, string, sending condition.

* instance: GetResult (document.all.userid.value)

* author:wanghr100 (grey bean baby. Net)

* update:2004-5-27 19:02

*-GetResult (str)-

, /

Var oBao = new ActiveXObject ("Microsoft.XMLHTTP")

OBao.open ("POST", "Server.asp?sel=" + str,false)

OBao.send ()

/ / the server-side processing returns a string encoded by escape.

/ / return data through XMLHTTP and start building Select.

BuildSel (unescape (oBao.responseText), document.all.sel2)

}

Function BuildSel (str,sel)

{

/ *

*-BuildSel (str,sel)-

* BuildSel (str,sel)

* function: build Select through str.

* Parameter: str, string, returned by the server. There is a specific structure "string 1, string 2, string 3"

* Parameter: sel, the Select to be built

* instance: BuildSel (unescape (oBao.responseText), document.all.sel2)

* author:wanghr100 (grey bean baby. Net)

* update:2004-5-27 19:02

*-BuildSel (str,sel)-

, /

/ / clear the original data first.

Sel.options.length=0

Var arrstr = new Array ()

Arrstr = str.split (",")

/ / start building a new Select.

For (var iTuno Bandi)

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