您如何从Javascript调用OnPageIndexChanging？

Question

I have code that when a user wants to page through a GridView, it asks them (using a JavaScript confirm) if they want to save the data from the grid. So, I'm able to get the confirm to work (with the code-behind saving function), but I'm noticing that it's not firing the OnPageIndexChanging method - which basically defeats the purpose here.

So, to summarize, can JavaScript access the OnPageIndexChanging method?

Thanks a lot

Answer 1

The OnPageIndexChanging event is a server-side event, so it's not surprising that your Javascript handler isn't getting triggered.

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I'm not sure if ASP.Net has a "built in" way to do this; but you can do it by attaching your own Javascript listeners. Here is the general approach (I'm using JQuery to make it easier):

1. Write a JQuery selector that gets all the paging links that you want to confirm.
2. Add a click listener for each of those links
3. Make the confirm function the handler for those listeners

So, the code would look something like this:

$("#grid a").each(function () {
    $(this).click(function () {
        return confirm("really?");
    });
});

_Notes

1. Here grid is the ID of the GridView control, so #grid a selects every a tag within my grid.
2. Using return confirm() returns false if the user does not confirm, which effectively cancels the click event.