尝试从Ajax静态WebMethod获取asp.net（C＃）文本框文本时出错

Question

I am using an ajax htmleditor in asp.net web application so i am trying to get the text the user has entered in the editor then i will send that text back to the client javascript function that will show the text in a div. But I am getting this error "Object reference not set to an instance of an object."

Firstly i tried to access the text of textbox linked with htmleditorextender through javascript but it was not working for me so i moved to ajax webmethod but this time also i am facing a problem. Please Help me.

    [System.Web.Services.WebMethod]
    public static string seteditor()
    {
        String x="";
        try
        {
            Content c = new Content();
            x = c.txteditor.Text;
        }
        catch (Exception ex) { x=ex.Message; }
        return x;
    }

Here, txteditor is the ID of asp:textbox which is linked with ajaxcontroltoolkit htmleditorextender.

Answer 1

You cannot get your aspx controls inside a static method. If you are Calling a static method from jquery means the Page and its Controls don't even exist. You need to look another workaround for your problem.

EDIT:

I always pass my control values to page methods like this:

Assume I have two text controls: txtGroupName and txtGroupLevel

...My JS with Jquery will be :

var grpName = $("#<%=txtGroupName.ClientID%>").val();
var grpLevel = $("#<%= txtGroupLevel.ClientID %>").val();

data: "{'groupName':'" + grpName + "','groupLevel':'" +   grpLevel + "'}",

Where groupName and groupRights are my webmethod parameters.

EDIT2:

Include your script like this:

<script type="text/javascript" src="<%= ResolveUrl("~/Scripts/jquery-1.4.1.js") %>"></script>  

I suggest you to use the latest jquery version.

Answer 2

Web methods do not interact with the page object or the control hierarchy like this. That's why they're static in the first place. You need to pass the text from the client as a parameter to the web method, not read it from the textbox.

Answer 3

This issue was torturing me from last 18 hours continuously
First I tried javascript than webmethod and than on user1042031's suggestion I tried jquery and than again I tried javascript and look how much easily it can be done with a single line of code.

var a = document.getElementById('<%= txteditor.ClientID %>').value;

read this stackoverflow article Getting Textbox value in Javascript

I apologize to everyone who responded me in this question but i have not found that article in my initial search.