在事件处理程序中发送不带XHR的http请求

Question

如何使用javascript作为事件处理程序使用post / get方法发送http请求？谢谢！保罗

Answer 1

好的，你不想使用Ajax。 您可以使用事件处理程序提交表单！

<a href='#' onclick='cow_submit("zoodle")'>send</a>
<form method='post' id='formie' action='find_some_action.php'>
  <input type='hidden' id='snoutvar' name='snoutvar' value='snout'>
</form>

<script>
function cow_submit(a_var_to_set){
  var plip=document.getElementById('formie');
  var snout=document.getElementById('snoutvar');
  snout.value=a_var_to_set;
  plip.submit();
  }

请参阅 https://developer.mozilla.org/en/DOM/form

Answer 2

使用 XmlHttpRequest

示例代码：

var client = new XMLHttpRequest();
client.onreadystatechange = handler;
client.open("GET", "test.xml");
client.send();

function handler()
{
   // your handler
}

Answer 3

您可以使用 XMLHttpRequest 从javascript发送请求

发送GET请求

var url = "get_data.php";
var params = "lorem=ipsum&name=binny";
http.open("GET", url+"?"+params, true);
http.onreadystatechange = function() {//Call a function when the state changes.
    if(http.readyState == 4 && http.status == 200) {
        alert(http.responseText);
    }
}
http.send(null);

发送POST请求

var url = "get_data.php";
var params = "lorem=ipsum&name=binny";
http.open("POST", url, true);

//Send the proper header information along with the request
http.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
http.setRequestHeader("Content-length", params.length);
http.setRequestHeader("Connection", "close");

http.onreadystatechange = function() {//Call a function when the state changes.
    if(http.readyState == 4 && http.status == 200) {
        alert(http.responseText);
    }
}
http.send(params);

在用户输入的情况下，不要忘记使用 encodeURIComponent 对参数进行编码以进行参数值编码

e.g。

params="paramName="+encodeURIComponent(paramValue);

Answer 4

执行此操作的标准类是 XmlHttpRequest ，但它并非普遍支持。在某些浏览器上，您必须使用 ActiveXObject（＆quot; Microsoft.XMLHTTP＆quot;）。

查看 jQuery 系统，该系统提供HTTP下载（AJAX样式）方法，无论底层浏览器API如何（因此避免在Tzury的回答中显示很多代码。）

jQuery AJAX文档位于 http://docs.jquery.com/Ajax

Answer 5

您应该尝试在隐藏字段中添加字符串，然后调用form.submit（）将表单提交到操作中的页面定义。

<script type="text/javascript">
  function doTestFormSubmit(yourString) {
    document.getElementById("myString").value=myString;
    document.getElementById("testForm").submit();
  }
</script>
<form name="testForm" id="testForm" action="yourDesiredPage.php" method="post">
   <input type="hidden" name="myString" id="myString" value=""/>
</form>

Answer 6

Ajax教程（ http://code.google.com/ EDU / AJAX /教程/ AJAX-tutorial.html ）

var obj;

function ProcessXML(url) {
  // native  object

  if (window.XMLHttpRequest) {
    // obtain new object
    obj = new XMLHttpRequest();
    // set the callback function
    obj.onreadystatechange = processChange;
    // we will do a GET with the url; "true" for asynch
    obj.open("GET", url, true);
    // null for GET with native object
    obj.send(null);
  // IE/Windows ActiveX object
  } else if (window.ActiveXObject) {
    obj = new ActiveXObject("Microsoft.XMLHTTP");
    if (obj) {
      obj.onreadystatechange = processChange;
      obj.open("GET", url, true);
      // don't send null for ActiveX
      obj.send();
    }
  } else {
    alert("Your browser does not support AJAX");
  }
}


function processChange() {
    // 4 means the response has been returned and ready to be processed
    if (obj.readyState == 4) {
        // 200 means "OK"
        if (obj.status == 200) {
            // process whatever has been sent back here:
        // anything else means a problem
        } else {
            alert("There was a problem in the returned data:\n");
        }
    }
}