我有一个
jquery ajax代码如下：
$(document).ready(function() {
var global_arr = new Array();
$.ajax({
url: 'result.PHP',type: 'post',dataType: 'json',success: function(data) {
$.each(data,function(key,value) {
global_arr.push(value.name);
});
alert(global_arr); //get correct value,works fine
}
}); //end of ajax function
alert(global_arr); //get null,it doesn't work properly
});
解决方法
Ajax需要时间来完成.函数执行时间不会太长.因此,当您在ajax请求之外获得警报时,ajax请求仍然使用时间来完成(在传输或服务器端操作中).
您始终可以等待ajax方法完成.
$(document).ready(function() {
var global_arr = new Array();
var complete = false;//flag to wait for ajax completion
$.ajax({
url: 'result.PHP',success: function(data) {
$.each(data,value) {
global_arr.push(value.name);
});
alert(global_arr); //get correct value,works fine
complete = true;//mark ajax as complete
}
}); //end of ajax function
(function runOnComplete(){
if( complete ){//run when ajax completes and flag is true
alert(global_arr);
}else{
setTimeout(runOnComplete,25);//when ajax is not complete then loop
}
})()
});
但是,最常见的方法是使用回调.
$(document).ready(function() {
function runOnComplete(){//code executes once ajax request is successful
alert(global_arr);
}
var global_arr = new Array();
$.ajax({
url: 'result.PHP',value) {
global_arr.push(value.name);
});
alert(global_arr); //get correct value,works fine
runOnComplete();//callback
}
}); //end of ajax function
});
