如何将参数传递给 jQuery $.getJSON 回调方法？

Question

I'm trying to use jQuery to call some custom API via Ajax/$.getJSON .

I'm trying to pass a custom value into the Ajax callback method, but that value is not getting passed through and is actually getting overwritten. This is my code:

var locationType = 3;
var url = 'blah blah blah' + '&locationType=' + locationType;

$("#loading_status").show();

$.getJSON(url, null, function(results, locationType) {
    searchResults(results, locationType)
});

The value of locationType BEFORE I call the URL using AJAX is 3 . But after the call returns the data successfully, the value for locationType is now success . This is because the method signature of the callback is:

callback(data, textStatus)A callback function that is executed if the request succeeds.

How can I pass 1 or more parameters to a callback method?

Answer 1

Warp in a function, eg

function getResults(locationType) {
    $.getJSON(url, null, function(results) {
        searchResults(results, locationType)
    });
}

But in you specific situation you don't even have to pass it, you can access the value directly in the callback.

Answer 2

You don't need to pass it in, just reference the variable you already have, like this:

var locationType = 3;
var url = 'blah blah blah' + '&locationType=' + locationType;
$("#loading_status").show();
$.getJSON(url, null, function(results) {
    searchResults(results, locationType)
});

Also there's no need to pass null if you don't have a data object, it's an optional parameter and jQuery checks if the second param is a function or not, so you can just do this:

$.getJSON(url, function(results) {
    searchResults(results, locationType)
});

Answer 3

You could use the .ajax method:

var locationType = 3;
var url = 'blah blah blah' + '&locationType=' + locationType;
$.ajax({
    url: url,
    context: { lt: locationType },
    success: function(results) {
        searchResults(results, this.lt);    
    }
});

Answer 4

If you want to use locationType (whose value is 3 ) in the callback, simply use

function(results) { .....

thanks to closures , locationType will be automatically available in the callback.

Answer 5

Could try:

function getResults(locationType) {
    $.getJSON(url, {p1:'xxx', p2: 'yyy'}, function(results) {
        searchResults(results, locationType)
    });
}

Answer 6

$.getJSON("url",
        "//here you can define your id, secure key to check data in your console, if you don't have condition for id and secure key just remove the secure key part."
        {secure_key:"noaccess"}, function(data){
            console.log(data);
});