从JavaScript调用一个VB.net功能 [英] calling a VB.net function from javascript

问题描述

我需要找到一种方法，从JavaScript调用vb.net函数在我的aspx页面。我有一个jQuery函数，使.drop类.droppable，每当我滴个.draggable到下降的目标，我的Jquery code成功地发射一个java警告声明。所有的纯JavaScript。我需要做的是一些沉重的数学！

我不明白，存在的JavaScript客户端，ASP / VB存在服务器端，从来没有，二人见面。从谷歌的研究，这似乎是一个理想的方式来得到什么，我需要做，是触发我的更新面板异步回发。我创建了一个隐藏的按钮被称为HiddenButton，我也创建了一个名为HiddenLabel隐藏的标签。我如何得到它的工作，所以当我掉了什么东西，我的JavaScript调用的东西，在HiddenLabel（这样我就可以将值传递给服务器端）更新包括文本，并以某种方式触发HiddenButton_click事件？

我目前的javascript善良看起来是这样的：

 ＆LT;脚本类型=文/ JavaScript的＆GT;
  $（文件）。就绪（函数（）{
doReady（）;

变种PRM = Sys.WebForms.PageRequestManager.getInstance（）;
prm.add_endRequest（功能（S，E）{
    doReady（）;
}）;
}）;

传播doReady（）{

$（'拖'）拖动（{回复：真，助手：克隆}）;
$（'滴'）。投掷的（{
    宽容：触摸，//这里应该是一个字符串
    下降：函数（）{警报（'下降'）; }
 

这就是我认为有些事情需要去更新标签和触发回发的，但我不知道它是什么:(

 }）;

} //结束做准备
＆LT; / SCRIPT＆GT;
 

解决方案

您可以使用隐藏变量的OnValueChanged事件。电线了该事件，改变隐变量的值，并写入这一说法 -

  __ doPostBack（'＆LT;％= hdnHidden.UniqueID％＆GT;'，''）; //此语句将触发OnValueChanged事件和控制将被转移到服务器端，您可以更新标签，做你的处理。
 

I need to find a way to call a vb.net function in my aspx page from javascript. I have a Jquery function that makes the .drop class .droppable, and whenever I drop a .draggable onto a drop target, my Jquery code successfully fires a java alert statement. All in pure javascript. What I need to do is some heavy math!

I do understand that javascript exists client-side, ASP/VB exists server-side, and never the two shall meet. From google research, it seems like the ideal way to get what I need done, is to trigger an asynchronous postback in my update panel. I created a hidden button called "HiddenButton", and I also created a hidden label called "HiddenLabel". How do I get it to work so when I drop something, my javascript calls something that updates both the text in the HiddenLabel (so I can pass a value to server-side), and somehow fire the HiddenButton_click event?

My current javascript goodness looks like this:

<script type="text/javascript">  
  $(document).ready(function() {  
doReady();  

var prm = Sys.WebForms.PageRequestManager.getInstance();  
prm.add_endRequest(function(s, e) {  
    doReady();  
});  
});

function doReady() {

$('.drag').draggable({ revert: true, helper: 'clone' });
$('.drop').droppable({
    tolerance: "touch", // Here should be a string
    drop: function() { alert('dropped'); }

This is where I think something needs to go to update the label and trigger the post-back, but I don't know what it is :(

});

} // End of do ready
</script>

解决方案

You can use the hidden variable's OnValueChanged event. Wire up that event, change the value of the hidden variable, and write this statement -

__doPostBack('<%= hdnHidden.UniqueID  %>', ''); //This statement will fire the OnValueChanged event and the control will be moved to the server side where you can update the label and do your processing.

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