为什么在单击使用JavaScript的输入按钮时，我的asp.net页已刷新？

Question

I am using an html image button type like this:

<input id="wbsupld" type="image" value="upload" onclick="showwbsdiv()" src="images/Upload.png">

and the javascript function is:

 function showwbsdiv() {
        document.getElementById("masswbsupld").style.display = "block";
        return false;
    }

which is displaying a div "masswbsupld" but the problem is my page is getting refreshed and the div goes back to display="none" mode.

and i am using update panel .. is that causing this?

Answer 1

Because its type is image , an image input element will submit your form.

You need to do

onclick="return showwbsdiv();"