c# - button1.Attributes.Add("onclick", "javascript:window.open('page1.aspx?CheckedItem=&q

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my client side code button1.Attributes.Add("onclick", "javascript:window.open('page1.aspx?CheckedItem=" + checkedItem.ToString() + "','mywindow',');"); is not executing on the first click.But it is working fine from second click onwards.I wrote this code inside the button click event.

I had tried to put this inside the page_load ,but the problem is i need to return a value from this page. here is the code

protected void btnPreview_Click(object sender, EventArgs e)
{

    //StringBuilder checkedItem = new StringBuilder();
    checkedItem.Length = 0;
    foreach (ListItem i in chkValidation.Items)
    {
        if (i.Selected)
        {
            if (string.IsNullOrEmpty(Convert.ToString(checkedItem)))
            {
                checkedItem.AppendFormat(i.Text);

            }
            else
            {
                checkedItem.AppendFormat(",");
                checkedItem.AppendFormat(i.Text);
            }
        }
        btn_Preview.Attributes.Add("onclick",
                                   "javascript:window.open('TimePhaseAttributePreview.aspx?CheckedItem=" + 
                                   checkedItem.ToString() + "','mywindow','menubar=0,resizable=0,width=350,height=250');");
    }

Please help me

my client side code button1.Attributes.Add("onclick", "javascript:window.open('page1.aspx?CheckedItem=" + checkedItem.ToString() + "','mywindow',');"); is not executing on the first click.But it is working fine from second click onwards.I wrote this code inside the button click event.

I had tried to put this inside the page_load ,but the problem is i need to return a value from this page. here is the code

protected void btnPreview_Click(object sender, EventArgs e)
{

    //StringBuilder checkedItem = new StringBuilder();
    checkedItem.Length = 0;
    foreach (ListItem i in chkValidation.Items)
    {
        if (i.Selected)
        {
            if (string.IsNullOrEmpty(Convert.ToString(checkedItem)))
            {
                checkedItem.AppendFormat(i.Text);

            }
            else
            {
                checkedItem.AppendFormat(",");
                checkedItem.AppendFormat(i.Text);
            }
        }
        btn_Preview.Attributes.Add("onclick",
                                   "javascript:window.open('TimePhaseAttributePreview.aspx?CheckedItem=" + 
                                   checkedItem.ToString() + "','mywindow','menubar=0,resizable=0,width=350,height=250');");
    }

Please help me

• c#
• javascript
• asp

Share Improve this question Follow edited Jan 3, 2012 at 8:40 albertjan 7,82766 gold badges4646 silver badges7777 bronze badges asked Jan 3, 2012 at 8:06 user1117040user1117040 14122 gold badges22 silver badges1212 bronze badges 5

• Given your "I wrote this code inside the button click event" I will need to see the code! Got a jsfiddle? Also, don't put javascript: in the value of an onclick attribute. – Mr Lister Commented Jan 3, 2012 at 8:10
• hai MrLister,here is the code – user1117040 Commented Jan 3, 2012 at 8:11
• not related to the answer. above code you are adding attribute in a loop. it shoud be outside of the loop – Chamika Sandamal Commented Jan 3, 2012 at 9:26
• @MrLister why not putting javascript there? – draks ... Commented Oct 26, 2012 at 7:35
• Because it's redundant. onclick="dosomething()" has the same result as onclick="javascript:dosomething()" so you don't need the javascript:. The colon also makes it look (to the untrained eye) like a URL. – Mr Lister Commented Oct 26, 2012 at 9:16

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2 Answers 2

Sorted by: Reset to default 0

put the code in any page event. like page_load,init.. or use RegisterClientScriptBlock

You need to use OnClientClick, not OnCLick

Change your code to

button1.OnClientClick = "javascript:window.open('page1.aspx?CheckedItem=" + checkedItem.ToString() + "'
                        ,'mywindow',')";

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