Get variable & keep changes after postback

This question is related to: Hide div on clientside click

The issue I am having is that after postback event from asp.net happens onClick any clientside changes made reset how can I keep the client side changes I am making.

Second question how can I get a variable from code behind and pass it into my javascript to perform a comparison.

Html:

    <div runat="server" id="someDiv1" enableviewstate="true" >
        <asp:LinkButton OnClientClick="Show_Hide_Display()" 
                        ID="lbtnDiv1" 
                        runat="server" 
                        CausesValidation="true" 
                        OnClick="lbtn_onClickServer">
        </asp:LinkButton>
    </div>

    <开发者_JAVA技巧;div runat="server" class="tick" id="div2" style="display:none;" enableviewstate="true">
    </div>

Javascript:

<script type="text/javascript">

function Show_Hide_Display() {

    var div1 = document.getElementById("<%=someDiv1.ClientID%>");
    var div2 = document.getElementById("<%=div2.ClientID %>");

        if (div1.style.display == "" || div1.style.display == "block") {
            div1.style.display = "none";
            div2.style.display = "block";
        }
        else {
            div1.style.display = "block";
            div2.style.display = "none";
        }
}    

</script>

The OnClick event causes a postback like it should, on this occassion it checks if users, chosen username is available.

If it is available show a tick, if it isn't error.

I got the error working and am trying to program the tick on client side.

So OnClientClick I am able to toggle between some text and a tick. So I need to:

• Get the bool result from code behind
• After postback keep tick (if username is available)

I am almost there but can't quite figure the last two points out.

If you are using an UpdatePanel in your page, and assuming that div which you are trying to toggle is outside the control, you can always inject javascript on a partial postback:

Like for e.g. on your button's click event which executes on a partial postback make a call to ScriptManager.RegisterClientScriptBlock() --> How to retain script block on a partial postback?

Alternatively, you can append an end request handler. This is some javascript which should run after the partial postback. --> ASP.NET Register Script After Partial Page Postback (UpdatePanel)

The answer for the both questions lies of checking the boolean value send from the code behind.

1-----.in code-behind c#

protected void Page_Load(object sender, System.EventArgs e) {

var linkbtn = (Button)Page.FindControl("lbtnDiv1");

linkbtn .Attributes.Add("onClick", "Show_Hide_Display('" + parameter+ "')");

}

2------- change your javascript

function Show_Hide_Display(parameter)

{

if( paramater=='true') {

----your logic---

}

else

{

----your logic

}

}