setting javascript value from backend code

Question

I would like to know how I can set a javascript value from my backend code. I have this line of JS code:

 gts.push([ 'google_base_offer_id', 'ITEM_PRODUCT_SEARCH_ID']);

What I am trying at this moment is:

gts.push(['google_base_offer_id', document.getElementById("hidden").value]);

I have hidden value set in the markup:

<asp:HiddenField ID="hidden" runat="server" />

and in the backend code, OnPreRender event, I am doing this:

hidden.Value = product.ProductId.ToString();

The value gets set properly but when I am viewing source in the browser the value is not populated. Am I doing something wrong, is it possible to populate the value like that? Thanks in advance, Laziale

Answer 1

您应该能够做到：

gts.push(['google_base_offer_id', document.getElementById('<%= hidden.ClientID %>').value]);

Answer 2

You could also try this way:

If you are using a ScriptManager in your page, then in the code behind you could register the javascript value in a hidden field

ScriptManager.RegisterHiddenField(this, "hiddenKey", "hiddenValue");

Then in aspx page you could use

gts.push(['google_base_offer_id', document.getElementById("hiddenKey").value]);