[英]JavaScript jquery.ajax in success after loop nothing working
我需要将一些值传递给Javascript中的其他函数。 我已经从另一个PHP文件中获取了值,但是无法将其传递给任何其他Javascript函数。 FOR LOOP之后,没有任何事情可以成功进行。 需要帮忙?
url1 = 'http://localhost:81/Dashboard/admin/inc/dashboard.php';
$.ajax({
url: url1,
type: "POST",
dataType: "json",
success: function(data)
{
for(var i = 0; i <= 11; i++)
{
Month = data[i].Month;
Sales = data[i].Sales;
if (i == 0) global_ij = "[" + Month + "," + Sales + "]";
else global_ij = global_ij + "," + "[" + Month + "," + Sales + "]";
}
alert ("hello"); // this alert is also not working
}
});
那是因为您正在执行异步 AJAX操作。 换句话说,您在变量Month
, Sale
, global_ij
所做的赋值仅在该特定success
函数的范围内可用, global_ij
在该范围之外 。
一种解决方法是在AJAX调用中添加async: false
,这将迫使它退出异步行为,因此使您可以将分配给这些变量的值提供给所有其余代码块:
$.ajax({
url: url1,
async: false,
type: "POST",
dataType: "json",
success: function(data)
{
for(var i = 0; i <= 11; i++)
{
Month = data[i].Month;
Sales = data[i].Sales;
if (i == 0) global_ij = "[" + Month + "," + Sales + "]";
else global_ij = global_ij + "," + "[" + Month + "," + Sales + "]";
}
}
});
jQuery的AJAX调用返回会执行诸如.done()
.fail()
等方法的promise
对象。
另一方面,您还可以从AJAX调用中获得承诺 (可以在Javascript代码中的任何地方传递该承诺),并且当承诺被解析时调用它的.done()
处理函数。
var promise = $.ajax({/* settings */});
/* --- */
// promise passed to some other block of code
promise.done(function(){
//execute the block of code after the promise was resolved
});
看起来您的php返回8个元素,并且在您的成功方法中,循环迭代了11个项目,从而导致错误。
我分离了成功函数,并用您发布的数据进行了尝试,并用data.length替换了循环中的11。 看一下下面的codepen:
http://codepen.io/anon/pen/OyXzGb?editors=011
请注意,我添加了
var Month;
var Sales;
将这些临时变量保留在函数范围内。
您可能需要检查数据以查看它是否是正确的数组,以捕获错误。 在此行之前:
for(var i = 0; i < data.length ; i ++)
最终输出和一些尝试的方法:
var global_ij="";
function processData(data) {
var Month;
var Sales;
for(var i = 0; i < data.length; i++)
{
Month = data[i].Month;
Sales = data[i].Sales;
if (i == 0) global_ij = "[" + Month + "," + Sales + "]";
else global_ij = global_ij + "," + "[" + Month + "," + Sales + "]";
console.log(global_ij);
}
return global_ij;
}
首先尝试不使用ajax的此功能:
processData([{“ Month”:“ 1”,“ Year”:“ 2015”,“ Sales”:“ 19746.81”},
{“ Month”:“ 2”,“ Year”:“ 2015”,“ Sales”:“ 17902.26”},{“ Month”:“ 3”,“ Year”:“ 2015”,“ Sales”:“ 19223.84” },{“ Month”:“ 4”,“ Year”:“ 2015”,“ Sales”:“ 18840.88”},{“ Month”:“ 5”,“ Year”:“ 2015”,“ Sales”:“ 19889.97“},{” Month“:” 6“,” Year“:” 2015“,” Sales“:” 18509.85“},{” Month“:” 7“,” Year“:” 2015“,” Sales“ :“ 1886.81”},{“ Month”:“ 8”,“ Year”:“ 2015”,“ Sales”:“ 1740.34”}]));
您可能想使用.done()
修改您的代码以在循环外声明gloabla_ij变量。 像下面这样
var global_ij='0';
url1 = 'http://localhost:81/Dashboard/admin/inc/dashboard.php';
$.ajax({
url: url1,
type: "POST",
dataType: "json",
success: function(data)
{
for(var i = 0; i <= 11; i++)
{
Month = data[i].Month;
Sales = data[i].Sales;
if (i == 0) global_ij = "[" + Month + "," + Sales + "]";
else global_ij = global_ij + "," + "[" + Month + "," + Sales + "]";
}
}
});
如果在文件顶部声明var,则文件中的任何函数都可以使用它:
var global_ij; // declare variable in global scope of module/file
$.ajax({
url: 'http://localhost:81/Dashboard/admin/inc/dashboard.php',
type: "POST",
dataType: "json",
success: function(data) {
var i, month, sales, len = data.length;
for(i=0; i<=len; i++) {
month = data[i].Month;
sales = data[i].Sales;
if (i===0) global_ij = "[" + month + "," + sales + "]";
else global_ij = global_ij + "," + "[" + month + "," + sales + "]";
}
doSomething(); // can now call function after loop finished
}
});
func doSomething() {
// global_ij is now populated
}
PHP文件的响应为:
[
{"Month":"1","Year":"2015","Sales":"19746.81"}, // 1
{"Month":"2","Year":"2015","Sales":"17902.26"}, // 2
{"Month":"3","Year":"2015","Sales":"19223.84"}, // 3
{"Month":"4","Year":"2015","Sales":"18840.88"}, // 4
{"Month":"5","Year":"2015","Sales":"19889.97"}, // 5
{"Month":"6","Year":"2015","Sales":"18509.85"}, // 6
{"Month":"7","Year":"2015","Sales":"1886.81"}, // 7
{"Month":"8","Year":"2015","Sales":"1740.34"} // 8
]
然而你在循环
for(var i = 0; i <= 11; i++)
因此,当i >= 8
, data[i].Month
将引发“ data [i]未定义”错误。
只需使用.length
属性即可:
for(var i = 0; i < data.length; i++)
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