What causes unpredictability in JavaScript's window.onback function?

Currently, I am utilizing window.onback = history.forward(); in order to prevent users from re-submitting data. Although I acknowledge that this method is somewhat of a hack and not the ideal solution, my question pertains to another issue that has arisen. The problem lies in the fact that this code restricts other pages from successfully navigating back to the page where the code is implemented. Let me provide further clarification.

Initially, PageA.aspx contains the JavaScript code. When the user submits PageA, hits the Back button, and nothing occurs, it signifies that the functionality is working as intended. However, when the user proceeds to click on a link leading to PageB.aspx, which does not include the code, clicking the Back button fails to redirect them back to PageA.aspx. This creates a scenario where the user experiences identical behavior as if PageB also had the no-back JavaScript code in place.

Below is the implementation of the code in PageA.aspx:

<script type="text/javascript">
window.onback = history.forward();
</script>

I have validated that this code solely exists within PageA.aspx and is absent from the master page, included files, or any other locations. It's worth noting that the application is built on ASP.NET 2.0 and is operating within SharePoint 2007, with Internet Explorer 7 being utilized as the browser.

Any insights or suggestions on how to address this issue?

asp.netjavascriptback-button

Answer №1

Unfortunately, I am unable to test your environment and scenario as I lack the necessary time and SharePoint07 access. However, have you considered implementing a location test in your JavaScript?

You could try something along these lines:

<script type="text/javascript>
if (window.location.indexOf("PageA.aspx", 0) > 0)
{
   window.onback = history.forward();
}
</script>

While I can't provide an explanation for the issue you're facing, this approach may help restrict the scope of the hack.

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