从updatepanel调用javascript

Question

I'm using google charts to draw a set of charts changing chart type with a dropdownlist.

however, after wrapping the dropdownlist in an updatepanel, the javascript is no longer being fired. first line in javascript is an alert to confirm.

the code that's supposed to fire the javascript:

protected void Unnamed_SelectedIndexChanged(object sender, EventArgs e) {
    DropDownList ddl = (DropDownList)sender;
    if (ddl.SelectedItem != null) {
        ClientScriptManager cs = Page.ClientScript;
        string script = String.Format("drawChart(\'{0}\',\'{1}\',\'{2}\',\'{3}\',\'{4}\');", chart.ClientID, ddl.SelectedValue.ToString(), "i en kage i gram", "string,NOGETTEKST;number,Mængde", "Mel,500;Sukker,500;Smør,100;Salt,32;Vand,400;Cola,150");
        cs.RegisterStartupScript(typeof(Page), "isActive", script, true);
    }
}

this worked fine before i put the updatepanel around the dropdownlist.

<asp:UpdatePanel runat="server" ID="hejbamse" ChildrenAsTriggers="true">

<ContentTemplate>
    <asp:DropDownList runat="server" OnSelectedIndexChanged="Unnamed_SelectedIndexChanged" ID="ddl" AutoPostBack="true">
        <asp:ListItem Text="" />
        <asp:ListItem Text="LineChart" />
        <asp:ListItem Text="PieChart" />
        <asp:ListItem Text="BarChart" />
        <asp:ListItem Text="ColumnChart" />
    </asp:DropDownList>
    <div id="chart" style="width: 900px; height: 500px;" runat="server"></div>
</ContentTemplate>

i've tried different approaches using scriptmanager instead of clientscript inspired from different answers on SO, but with no luck.

EDIT:

replacing:

cs.RegisterStartupScript(typeof(Page), "isActive", script, true); 

with:

ScriptManager.RegisterStartupScript(updatepanelid, updatepanelid.GetType(), Guid.NewGuid().ToString(), script, true);

fixied it.

Answer 1

You can try put the script in a Literal, instead of

cs.RegisterStartupScript(typeof(Page), "isActive", script, true);

PS. I haven't test it.