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IE progress bar never stops incrementing...
Web Programming262
Hello, I'm able to reproduce my problem but I haven't been able to figure out why it is happening. MS does have an article about such behavior in support.microsoft.com/default.aspx but the workaround prescribed in the KB isn't particularly helpful. The project I'm working on serves up a custom jpg image on the client side at runtime (think MapQuest or Google Maps). We use a COTS product here to handle the image creation. You'll see the references to the COTS in the code below through use of the "aims" namespace. As you will also see, there's no rocket science to the code I've posted. I'm using some code which was given to me. I've pasted it below in as a lightweight version. To support some custom functionality (zooming in and out and identifying objects on the map via a mouseclick among other things), this code creates the jpg on the server side, places the path to the jpg in a hidden field, and then on the client side the hidden field value is set to an html img src. The problem is the browser's progress bar always keeps increasing and never stops. Everything else appears to be working normally and the user can mess around with the page. But the cursor always stays as the hourglass and pointer combo and the browser's progress bar never stops incrementing (albeit very slowly). Eventually, as the page runs for an extended period of time, the browser throws a stack overflow and the whole thing starts hindering the performance of the host machine. I did some debugging and noticed that the codebehind Page_Load event handler keeps getting called repeatedly. Thinking this was because of the time it takes for the image to be displayed versus rending the rest of the page, the whole thing thinks the Page_Load event never completes... kind like an infinite loop. To get around that I tried wrapping the code in the Page_Load event handler in an If Not Page.IsPostBack... but that didn't help either. I'm now suspecting the problem could be due to the img onload event handler clashing with the code behind Page_Load event handler. But nothing too terribly complicated is going on there... I'm just going out and assigning the src property to the hidden field's value property. Suggestions are greatly appreciated. Thanks! 1. HTML: <body> <form id="form1" runat="server"> <div> <img id="mapImage" src="Images/null.gif" onload="getImage();"/> <br /> <asp:HiddenField ID="mapImageSrc_hidden" runat="server" /> </div> </form> </body> 2. Server-side Code: Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load Dim resultRefresh, urlImage Dim mConnector As New aims.ArcIMSConnector mMap = Server.CreateObject("aims.Map") mConnector = Server.CreateObject("aims.ArcIMSConnector") mConnector.ServerName = "csfdcrw" mConnector.ServerPort = 5300 resultInit = mMap.InitMap(mConnector, "Internal") resultRefresh = mMap.Refresh() urlImage = mMap.GetImageAsUrl() Me.mapImageSrc_hidden.Value = urlImage End Sub 3. Client-side Code: function getImage() { var objHiddenImage = document.getElementById("mapImageSrc_hidden"); var objMapImage = document.getElementById("mapImage"); objMapImage.src = objHiddenImage.value } - |