jQuery Question
intercept form submit with jQuery
I wanna intercept a submit via jQuery and first check if a file is present on the server. If it's present continue with the request, if not display a message and dont send the request. This is what I have:
$("#methodForm").submit(function(e){
checkIndex('upload/segments.gen').done(function() {
return true;
}).fail(function () {
e.preventDefault();
alert("No index present!");
return false;
});
});
this is the checkIndex()
function checkIndex(file){
return $.ajax({
url : file,
type:'HEAD'
});
}
What happens is this: The file is present on the server, but the checkIndex returns with fail. First I see the alert popup and then it continues and sends the post request to the server.
I use the checkIndex() for other purposes as well where it works like expected so I'm pretty sure the error is somewhere in the submit routine. But I can't find out what's wrong with it.
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Answer Source
You can't return out of a callback to an asynchronous method(such as ajax). Instead, prevent the submit all together, then submit it when you are ready.
$("#methodForm").submit(function(e){
e.preventDefault();
var form = this;
checkIndex('upload/segments.gen').done(function() {
form.submit(); // submit bypassing the jQuery bound event
}).fail(function () {
alert("No index present!");
});
});
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