Can I get jQuery's load(url) to give me success/error feedback from the response?
I'm basically using a plug-in that makes use of the jQuery load(url) function.
Since .load() allows you to use a callback function with the response as parameter, I was wondering if there is a way to embed, for example, a variable indicating error or success in the file .load() is calling?
In the file that is called you could use something like $.myPlugin.response = "An error occured" and the callback function will be able to read it (At least in firefox). The problem however is that $.myPlugin.response now is global and if we were to make two .load() simultaneously we wouldn't be able to tell which call went bad.
Is there a way to contain this error variable within the callback function or at least in a tighter scope than global?
开发者_Python百科One way would be to parse the response with regex and look for a specific expression, but that does not feel like the right way to do it.
Could the use of custom headers work out somehow?
I hope the question makes sense
Cheers
Let's start with one of the examples from the documentation for .load():
<!DOCTYPE html>
<html>
<head>
<style>
body{ font-size: 12px; font-family: Arial; }
</style>
<script src="http://code.jquery.com/jquery-1.5.js"></script>
</head>
<body>
<b>Successful Response (should be blank):</b>
<div id="success"></div>
<b>Error Response:</b>
<div id="error"></div>
<script>
$("#success").load("/not-here.php", function(response, status, xhr) {
if (status == "error") {
var msg = "Sorry but there was an error: ";
$("#error").html(msg + xhr.status + " " + xhr.statusText);
}
});
</script>
</body>
</html>
Now we'll modify the script deal with a custom error that is returned by the web server or CGI script:
<script>
$("#success").load("/not-here.php", function(response, status, xhr) {
if (status == "custom_error") {
// the handler for custom_error goes here
}
});
</script>
You can tell jQuery to call a function whenever an Ajax call ends with an error response (see ajaxSetup):
$.ajaxSetup({
error: function(xhr, textStatus, errorThrown) {
alert(xhr.responseText)
}
});
Of course you must return a HttpServerError to achieve this result (how to do this depends on the server-side framework).
E.g. using Django:
from django.http import HttpResponse, HttpResponseServerError
def myAjaxCall(request):
""" Return the result if present;
if not present, return an error with the string "No value to return"
in case of any other error, return the error with its text.
"""
try:
value = compute_my_value(request)
if not value:
raise Exception, 'No value to return!'
return HttpResponse(value, mimetype="application/json")
except Exception, e:
return HttpResponseServerError(unicode(e))
加载中,请稍侯......
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