Javascript asp.net C＃多对象传递到Js代码文件

Question

I have code on html page and it is working:

document.getElementById('<%=IdOstan.ClientID %>').options.length = 0;

it is part of a function. Object is found and code run. But if I move code to a seperate js file, then call the file using :

<script src="../../../../Script/AjaxCall.js" type="text/javascript"></script>

then object is not found. My conclusion was that Object on the same file can be found with calling document.getElementById , but it is not true about object passed to Js, and seems normal. I have tried to pass object while calling JS function like this :

<asp:DropDownList ID="IdLand" runat="server" onchange="UpdateOstan(this);" 
     DataTextField="NameLand" DataValueField="IdLand" ViewStateMode="Enabled" 
     AutoPostBack="false">
</asp:DropDownList>

and it also works. But I need to pass a second object too I have tried :

onchange="UpdateOstan(this, IdsecondObj);"

which failed, also this

onchange="UpdateOstan(this, document.getElementById('IdSecondObject'));"

not working. So pleas let me know how to pass html object to Javascript which is not on the same page. I don't want to use jQuery files as helper,at all. Thanks

Answer 1

Use hidden input to store ID value of your IdOStan.ClientID and get that value for id name from your external javascript and then you can access that object.

<input id="MyHidden" value="<%=IdOstan.ClientID %>" />

In external JS file.

var id = document.getElementById('MyHidden').value;
var IdOstan = document.getElementById(id);

Now IdOstan is the object you are looking for.