Set the 'onClick' to call a client method when dynamically adding control in Code Behind

问题

I am dynamically adding a RadioButtonList in the Code Behind. I want it so that the 'OnClick' does not call JavaScript, but instead it calls a method in my code behind.

Is this possible?

In addition, is there a way to set it up so that this say control has runat="server"?

回答1:

Yes, it is possible. Also, there is no need to have runat="server" since your are creating the control in code.

You need to set your RadioButtonList object's OnSelectedIndexChanged event. As @Robert mentioned, if you are creating controls dynamically you need to wrap them in the Page_Init().

    protected void Page_Init(Object sender, EventArgs e) {
        RadioButtonList radiobuttonlist = new RadioButtonList();

        radiobuttonlist.SelectedIndexChanged += radiobuttonList_CheckedChanged;

        //Set the AutoPostBack to true proptery to that the user action
        // will immediately post-back to the server

        radiobuttonlist.AutoPostBack = true;
    }

    private void radiobuttonList_CheckedChanged(object sender, EventArgs e) {
        //Code you want to execut when a user selects a different item
    }

Reference: https://msdn.microsoft.com/en-us/library/System.Web.UI.WebControls.ListControl.SelectedIndexChanged(v=VS.110).aspx

回答2:

You can use the Button Click Event https://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.button.click(v=vs.110).aspx

回答3:

Be sure to add the control in the Page_Init() portion of the code, not in Page_Load() or later. Set up the event handler += line inside the Page_Init() setup. The control should run server side if you do this. I'm not sure if runat="server" will be explicitly set but the control will behave that way.

来源：https://stackoverflow.com/questions/32510291/set-the-onclick-to-call-a-client-method-when-dynamically-adding-control-in-cod

标签

ASP.NET

onclick

radiobuttonlist