Currently, I am working in an environment using Asp.net/C# and Visual Studio 2013 to develop a web application.
I have created a page (aspx) with a single iframe on it, along with a JavaScript method that utilizes jQuery to inject HTML into that frame.
<asp:Content runat="server" ID="MainSectionContent" ContentPlaceHolderID="MainSectionContentPlaceHolder">
<section runat="server" id="FrameSection" clientidmode="Static">
<asp:ContentPlaceHolder runat="server" ID="FrameSectionContentPlaceHolder" />
<iframe id="FrameContentFrame" name="FrameContentFrame" src="about:blank" seamless="seamless" onload=" loadFrameContent(); "></iframe>
</section>
<script type="text/javascript">
//<![CDATA[
function loadFrameContent() {
jQuery('#FrameContentFrame').contents().find('html').html('<%= FrameContent %>');
}
//]]>
</script>
</asp:Content>
In the code behind, I retrieve a lengthy string from a server and save it in the property FrameContent. This string contains valid HTML markup.
The expected outcome is that upon loading, the JavaScript function will execute, filling the iframe with HTML content and displaying the string to the user.
However, what actually occurs is that nothing is displayed initially. A JavaScript error stating "the function loadFrameContent is undefined" pops up. Strangely, if I view the page source in my browser, the function is clearly visible. When I right-click on the empty frame area and select "reload frame" (in Google Chrome), only then does the HTML content appear.
To clarify: The HTML string and frame are correct, as evidenced by manual reloading showing the content properly. Despite this, the frame fails to display the HTML automatically upon onload, requiring a manual reload for visibility. Checking the page source confirms the presence of both the JavaScript function and the populated FrameContent property containing the accurate HTML string.