10 examples of 'before send ajax' in JavaScript

134
function beforeSend() {
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    var forms = $(".form-row");
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    forms.each(function() {
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        var options = $(this).find("option")
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        options.each(function() {
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            if ($(this).attr("disabled")) {
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                $(this).attr("disabled", false);
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            }
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        })
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    });
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    return true;
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}

71
function send(_, complete) {
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    var script = jQuery("<script>").prop({
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        async: true,
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        charset: s.scriptCharset,
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        src: s.url
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    }).on(
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        "load error",
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        callback = function(evt) {
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            script.remove();
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            callback = null;
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            if (evt) {
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                complete(evt.type === "error" ? 404 : 200, evt.type);
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            }
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        }
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    );
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    document.head.appendChild(script[0]);
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}

56
function beforeSend(jqXHR, settings){
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    // show gif here, eg:
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    if(settings.url == 'postMetadata'){
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	$("#loading-modal").modal({
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	    keyboard: false,
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	    backdrop: 'static'
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	});
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        var errors = checkMandatory();
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        if(errors){
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	    closeModal();
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	    $("#error-message").text('Some of the Mandatory fields are not filled.  Please verify your data and try again.')
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	    $("#loading-alert").modal('show');
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	    jqXHR.abort();
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        }
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    }
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}

43
function executeAjax(form){
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	if (!form.valid()) 
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		return;
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	form.find(".submit").attr("disabled", true);
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	form.find(".cancel").attr("disabled", false);
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	var error = function(jqXHR) {
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		resetForm(form, false);
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		if (jqXHR.status == 400) {
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			errorPopup(Messages.get('error.occured'), form.parent(), "center-popup");
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			return;
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		}
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		errorPopup(Messages.get('error.occured'), form.parent(), "center-popup");
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		console.log(jqXHR);
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	};
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	var success = function(response, status, jqhr) {
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		var target = $("#" + form.data("ajax-result"));
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		var action = form.data("ajax-on-callback") || "replace-inner";
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		if (action == "replace-inner") {
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			target.html(response);
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		} else if(action == "append") {
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			target.append(response);
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		} else if(action == "replace"){
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			target.replaceWith(response);
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		}
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		target.removeClass("hidden");
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		resetForm(form, false);
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		bindAll();
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	};
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	var uri = form.attr("action");
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	$.ajax(uri, {
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		success: success,
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		error: error,
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		dataType : 'html',
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		data : form.serialize(),
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		method: "POST"
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	});
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}

17
function ajaxBindCallback()
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{
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	if (ajaxRequest.readyState == 4) 
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	{
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		if (ajaxRequest.status == 200) 
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		{
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			if (ajaxCallback)
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			{
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				ajaxCallback(ajaxRequest.responseXML);
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			} 
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			else 
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			{
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				alert('no callback defined');
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			}
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		} 
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		else 
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		{
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			alert("There was a problem retrieving the xml data:\n" + ajaxRequest.status + ":\t" + ajaxRequest.statusText + "\n" + ajaxRequest.responseText);
35
		}
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	}
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}

2
function sendAjax(divname,ajaxurl,text,nextstep)
3
{
4
  $.ajax({
5
   type: "GET",
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   url: ajaxurl,
7
   success: function(msg){
8
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    $(divname).html(msg);
10
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    var index = msg.indexOf(':');
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    var prefix = '';
13
    var error = '';
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    if(index>0)
15
      {
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      prefix = msg.substr(0,index);
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      error = msg.substr(index+1);
18
      }
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    if(prefix != "ERROR" && prefix != "WARNING")
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      {
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      $(divname).html(text+": <img src=\"img/check.gif\"/>");
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      nextstep();
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      }
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    else if(prefix == "WARNING")
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      {
27
      $(divname).html(text+": "+error+" <img src=\"img/check.gif\"/>");
28
      nextstep();
29
      }
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    else
31
      {
32
      $(divname).html("An error as occured");
33
      }
34
   },
35
   error:function (XMLHttpRequest, textStatus, errorThrown) {
36
    alert(textStatus+' '+errorThrown);
37
    }
38
39
   });
40
}

65
function run_ajax() {
66
    // Ajax to get the json:
67
68
    start_date = $('#start_date').val()
69
    end_date = $('#end_date').val()
70
    ticker = $("#ticker").find("option").filter(":selected").text();
71
72
    $.ajax({
73
        type: "GET",
74
        dataType: 'json',
75
        url: "/transactionsandcost_json?ticker=" + ticker + "&start=" + start_date + "&end=" + end_date,
76
        success: function (data) {
77
            $('#alerts').html("")
78
            console.log("ajax request: OK")
79
            console.log(data)
80
            handle_ajax_data(data, ticker, data['fx']);
81
82
        },
83
        error: function (xhr, status, error) {
84
            $('#alerts').html("<div class='small alert alert-danger alert-dismissible fade show' role='alert'>An error occured while refreshing data." +
85
                "<button type='button' class='close' data-dismiss='alert' aria-label='Close'><span aria-hidden='true'>&times;</span></button></div>")
86
            console.log(status);
87
        }
88
    });
89
};

39
function setup_ajax(){
40
41
	try{
42
	
43
		xmlHttp=new XMLHttpRequest();
44
		
45
	}catch (e){    // Internet Explorer    
46
47
		try{
48
	     	  	
49
			xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
50
      
51
			}catch (e){      
52
			
53
		try{        
54
					
55
			xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
56
					
57
	   	}catch (e){
58
				
59
			alert(AJAX_FAIL);
60
			return false;
61
		}      
62
	   }    
63
	}
64
}

15
function doAjax(method, url, callback) {
16
    if (window.GM_xmlhttpRequest) {
17
        GM_xmlhttpRequest({
18
            method: method,
19
            url: url,
20
            onload: callback,
21
        });
22
    } else {
23
        var xhr = new XMLHttpRequest();
24
        xhr.onreadystatechange = function() {
25
            if (xhr.readyState !== 4 || xhr.status !== 200) return;
26
            callback(xhr);
27
        };
28
        xhr.open(method, url, true);
29
    }
30
}

32
function ajaxSuccess(response) {
33
    if (response.status == 'success'){
34
        formValid(response.redirect_url);
35
    }
36
    else if (response.status == 'error'){
37
        formInvalid(response.form_errors);
38
    }
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}