重复XMLHttpRequest GET并显示结果 [英] repeated XMLHttpRequest GETs and displaying result
问题描述
我对javascript有点新鲜 - 下面将会很明显。
我正在使用XMLHttpRequest从服务器（django）获取一些数据，
，它适用于单个事件。但我的最终结果需要
才能成为一系列数据传输。我想在
及以上请求数据，直到数据为触发停止的某个值，这将是一个有趣的第一次尝试。为了继续前进，我在for-loop中包装了我的初始
单个数据请求，看看我是否可以进行多次通话。
这是'我的javascript东西......
I''m a bit new to javascript - as will be obvious below.
I''m using an XMLHttpRequest to get a bit of data from server (django),
and it works nicely for single events. But my eventual outcome needs
to be a series of data transmissions. I figured requesting data over
and over until the data is some value that triggers the stop would be
an interesting first attempt. To move forward, I wrapped my initial
single data request in a for-loop to see if I could do multiple calls.
Here''s my javascript stuff...
推荐答案
6月25日，2：44 *下午，RossGK< ros ... @ gmail.comwrote：
On Jun 25, 2:44*pm, RossGK <ros...@gmail.comwrote:
我对javascript有点新鲜 - 下面将会很明显。
我正在使用XMLHttpRequest从服务器（django）获取一些数据，
它运行良好f或单一事件。 *但我的最终结果需要
才能成为一系列数据传输。 *我想在
及以上请求数据，直到数据触发停止的某个值将是有趣的第一次尝试。 *为了继续前进，我在for-loop中包装了我的初始
单个数据请求，看看我是否可以进行多次通话。
这里''我的javascript东西...
* * * * for（i = 0; i< = 5; i ++）{
* * * * * * * * xmlHttp.onreadystatechange = function（）
* * * * * * * * {if（xmlHttp.readyState == 4）
* * * * * * * * * * * * {document.myForm.myvar.value = xmlHttp.responseText;
* * * * * * * * * * * *}
* * * * * * * *}
* * * * * * * * xmlHttp.open（" GET"，" / ajax_data"，true）;
* * * * * * * * xmlHttp.send（null）;
* * * * * * * * // alert（来这里）
* * * * * * * * dopause（500）; * * * * //等待500毫秒
* * * * *}
我注意到的是，该警报线被注释掉，没有
似乎发生了 - 我没看到数据收到。 *我希望看到
闪存5次（服务器发送一个随机数）
当我发出警报时，警报确实会弹出显示数据
。
警报消息是否会导致我需要模拟的窗口刷新
警报不存在。 *我需要做些什么来让它循环
通过get 5次实际显示出现的内容，没有
使用警报弹出！？
感谢您的任何建议
I''m a bit new to javascript - as will be obvious below.
I''m using an XMLHttpRequest to get a bit of data from server (django),
and it works nicely for single events. *But my eventual outcome needs
to be a series of data transmissions. *I figured requesting data over
and over until the data is some value that triggers the stop would be
an interesting first attempt. *To move forward, I wrapped my initial
single data request in a for-loop to see if I could do multiple calls.
Here''s my javascript stuff...
* * * * for (i=0;i<=5;i++) {
* * * * * * * * xmlHttp.onreadystatechange=function()
* * * * * * * * { if (xmlHttp.readyState==4)
* * * * * * * * * * * * { document.myForm.myvar.value=xmlHttp.responseText;
* * * * * * * * * * * * }
* * * * * * * * }
* * * * * * * * xmlHttp.open("GET","/ajax_data",true);
* * * * * * * * xmlHttp.send(null);
* * * * * * * * //alert("got here")
* * * * * * * * dopause(500); * * * *//wait 500ms
* * * * * }
What I''ve noticed is that with that alert line commented out, nothing
seems to happen -ie I don''t see the data receive. *I expected to see
it flash 5 times (the server sends a random number)
When I put the alert in, the alert does in fact pop up, and the data
gets displayed.
Does the alert message cause a window refresh that I need to emulate
when the alert is not there. *What do I need to do to make it cycle
through the get 5 times and actually show me what comes up, WITHOUT
using an alert pop!?
Thanks for any suggestions
希望我可以测试一下，但我没有资源。我假设
myvar是表单中的文本字段或文本区域？尝试在本节中附上
响应文本 - 不只是设置它（不是作为一个
永久解决方案，请注意，但只是为了调试）。可能是用空响应覆盖了
。
Wish I could test this, but I don''t have the resources. I''m assuming
the myvar is a text field or text area in your form? Try appending
the responsetext to this section - not just setting it (not as a
permanent solution, mind you, but just to debug). It may be being
overwritten with a null response.
希望我能测试一下，但我没有资源。我假设
myvar是表单中的文本字段或文本区域？
Wish I could test this, but I don''t have the resources. I''m assuming
the myvar is a text field or text area in your form?
是的，文本在下面的表格中分配给myvar ...
< form name =" myForm">
Stuff：< input type =" text"的onkeyup = QUOT; getServerData（）;"命名= QUOT;用户名" /
Yes, the text gets assigned to myvar in the form below...
<form name="myForm">
Stuff: <input type="text" onkeyup="getServerData();" name="username" /
>
>
响应：< input type =" text"名称= QUOT; MYVAR" />
< / form>
....正如我所说，在单个事件中或使用警报
pop。
Response: <input type="text" name="myvar" />
</form>
.... and as I say works nicely in a single event, or with the alert
pop.
尝试将responsetext附加到此部分 - 不仅仅是设置它（而不是作为
永久解决方案，请注意，但只是为了调试）。它可能是用空响应覆盖了
。
Try appending the responsetext to this section - not just setting it (not as a
permanent solution, mind you, but just to debug). It may be being
overwritten with a null response.
不确定你的意思......你的意思是某种打印
声明？ （对不起，我的javascript漏洞正在显示）....
Not sure what you mean... do you mean like some sort of print
statement? (sorry my javascript weakness is showing)....
6月25日，3：44 * pm，RossGK< ros ... @ gmail.comwrote：
On Jun 25, 3:44*pm, RossGK <ros...@gmail.comwrote:
希望我可以测试一下，但我没有资源。 *我假设
myvar是表单中的文本字段或文本区域？
Wish I could test this, but I don''t have the resources. *I''m assuming
the myvar is a text field or text area in your form?
是的，文本在下面的表格中分配给myvar ...
< form name =" myForm">
* * * * Stuff：< input type =" text"的onkeyup = QUOT; getServerData（）;"命名= QUOT;用户名" /
* * * *响应：< input type =" text"名称= QUOT; MYVAR" />
< / form>
......正如我所说，在单个活动中或使用警报时效果很好
pop。
Yes, the text gets assigned to myvar in the form below...
<form name="myForm">
* * * * Stuff: <input type="text" onkeyup="getServerData();" name="username" /
* * * * Response: <input type="text" name="myvar" />
</form>
... and as I say works nicely in a single event, or with the alert
pop.
尝试将响应文本附加到此部分 - 而不仅仅是设置它（而不是作为
永久解决方案，介意你，但只是为了调试）。 *可能是用空响应覆盖了
。
Try appending the responsetext to this section - not just setting it (not as a
permanent solution, mind you, but just to debug). *It may be being
overwritten with a null response.
不确定你的意思......你的意思是某种打印
声明？ *（对不起，我的javascript弱点显示）....
Not sure what you mean... do you mean like some sort of print
statement? *(sorry my javascript weakness is showing)....
尝试document.myForm.myvar.value + = xmlHttp.responseText;
而不是
document.myForm.myvar.value = xmlHttp.responseText;
Try document.myForm.myvar.value+=xmlHttp.responseText;
instead of
document.myForm.myvar.value=xmlHttp.responseText;
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