Question

我希望在固定的时间间隔内读取XML文档，并在每次查找更新时避免完整页面刷新。下面的代码被注释掉了，但却搞乱了JQuery循环。（基于http://buildinternet.com/project/totem/）需要一些帮助。

//function refresh()
//    {

var xhttp = new XMLHttpRequest();

xhttp.onreadystatechange = function() {
    if (this.readyState == 4 && this.status == 200) {
        myFunction(this);
    }
};

xhttp.open("GET", "drift.xml", true);
xhttp.send();

//  }
function myFunction(xml) {
    var xmlDoc = xml.responseXML;
        var item = xmlDoc.getElementsByTagName("item");
        var itemlength = item.length;
        var i;
        var html='';
        var today = new Date();

        var aktuella = [];
        $("#wrapper").append('<ul id=\'wrap\'></ul>');

        for (i = 0; i < itemlength; i++) {
        var postDate = xmlDoc.getElementsByTagName("expires")[i].childNodes[0].nodeValue;
        var date = postDate.substring(8, 10);
        var month = postDate.substring(5, 7);
        var year = postDate.substring(0, 4);
        var expiredDate = new Date(year, month - 1, date);

        if (expiredDate > testDate) {
        aktuella.push(i);
        }
    };

    if (aktuella.length == 0 ) {
        var none = "<p>Info</p>";
        $('#wrapper').prepend(none);
    };

    if (aktuella.length == 1) {
        var expires = '<p>' + xmlDoc.getElementsByTagName("expires")[0].parentNode.childNodes[1].textContent + '</p>';  
        $('#wrapper').prepend(expires);
    };

    if (aktuella.length > 1) {
        for (i = 0; i < aktuella.length; i++) {
        var expires = '<li id="' + i + '">' + xmlDoc.getElementsByTagName("expires")[i].parentNode.childNodes[1].textContent + ' - Se Driftinfo</li>';  
        $('#wrap').prepend(expires);
        };
    };


    $(function(){
        $('#wrap').totemticker({
            row_height  :   '120px',
            next        :   '#ticker-next',
            previous    :   '#ticker-previous',
            stop        :   null,
            start       :   null,
            mousestop   :   true,
            });
        });
    }   

  //  refresh();
  //  setInterval("refresh()", 5000);
  </script>

Answer 1

简单：添加这个你的脚本：

setInterval(function(){
var xhttp = new XMLHttpRequest();

xhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
    myFunction(this);
}
};
}, milliseconds);

Answer 2

现在尝试一下。那里有一个错误。功能代替功能和调用函数后的间隔

function myFunction(xml) {
var xmlDoc = xml.responseXML;
    var item = xmlDoc.getElementsByTagName("item");
    var itemlength = item.length;
    var i;
    var html='';
    var today = new Date();

    var aktuella = [];
    $("#wrapper").append('<ul id=\'wrap\'></ul>');

    for (i = 0; i < itemlength; i++) {
    var postDate = xmlDoc.getElementsByTagName("expires")   [i].childNodes[0].nodeValue;
    var date = postDate.substring(8, 10);
    var month = postDate.substring(5, 7);
    var year = postDate.substring(0, 4);
    var expiredDate = new Date(year, month - 1, date);

    if (expiredDate > testDate) {
    aktuella.push(i);
    }
 };

setInterval(function(){
var xhttp = new XMLHttpRequest();

xhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
myFunction(this);
}
};
xhttp.open("GET", "drift.xml", true);
xhttp.send();
}, milliseconds);

Answer 3

以下是没有尝试刷新ajax的网站：

http://socialsiberia.com/dash/test1.html

以下是我添加以下代码时出现的奇怪行为：

http://socialsiberia.com/dash/test2.html

setInterval(function(){
var xhttp = new XMLHttpRequest();

xhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
    myFunction(this);
        }
    };

xhttp.open("GET", "test.xml", true);
xhttp.send();

}, 5000);

Answer 4

var xhttp = new XMLHttpRequest();    
function myFunction(xml) {
var xmlDoc = xml.responseXML;
    var item = xmlDoc.getElementsByTagName("item");
    var itemlength = item.length;
    var i;
    var html='';
    var today = new Date();

    var aktuella = [];
    $("#wrapper").append('<ul id=\'wrap\'></ul>');

    for (i = 0; i < itemlength; i++) {
    var postDate = xmlDoc.getElementsByTagName("expires")[i].childNodes[0].nodeValue;
    var date = postDate.substring(8, 10);
    var month = postDate.substring(5, 7);
    var year = postDate.substring(0, 4);
    var expiredDate = new Date(year, month - 1, date);

    if (expiredDate > testDate) {
    aktuella.push(i);
    }
};

if (aktuella.length == 0 ) {
    var none = "<p>Info</p>";
    $('#wrapper').prepend(none);
};

if (aktuella.length == 1) {
    var expires = '<p>' + xmlDoc.getElementsByTagName("expires")[0].parentNode.childNodes[1].textContent + '</p>';  
    $('#wrapper').prepend(expires);
};

if (aktuella.length > 1) {
    for (i = 0; i < aktuella.length; i++) {
    var expires = '<li id="' + i + '">' + xmlDoc.getElementsByTagName("expires")[i].parentNode.childNodes[1].textContent + ' - Se Driftinfo</li>';  
    $('#wrap').prepend(expires);
    };
};


$(function(){
    $('#wrap').totemticker({
        row_height  :   '120px',
        next        :   '#ticker-next',
        previous    :   '#ticker-previous',
        stop        :   null,
        start       :   null,
        mousestop   :   true,
        });
    });
}

funtion makeinterval(){

xhttp.onreadystatechange = function() {
  if (this.readyState == 4 && this.status == 200) {
  myFunction(this);
 }
};
xhttp.open("GET", "drift.xml", true);
xhttp.send();
}

setInterval(function(){
 makeInterval();
}, 5000);
makeinterval()

Ajax刷新XMLhttprequest

4 个答案: