检查什么样的控制发起AJAX请求 [英] Check what control initiated AJAX Request

问题描述

asp.net 2.0 / jQuery的/ AJAX

asp.net 2.0 / jQuery / AJAX

<script type="text/javascript">
//updated to show proper method signature

var prm = Sys.WebForms.PageRequestManager.getInstance();

prm.add_endRequest(hideMessage);

function hideMessage(sender, args)
{
    var ctl = args.get_postBackElement();
    //check if ctl is the disired control
    //hide user notification message
}
</script>

我有可能会启动AJAX请求页面上的多个控件，但我只希望我的JS火当我点击一个特定的按钮。我如何检查什么控制发起请求，这样我可以相应地火JS。

i have several controls on the page that might initiate the AJAX request, but i only want my js to fire when i click one particular button. how do i check what control initiated the request so i can fire JS accordingly.

编辑：我的工作围绕它，但我仍想知道如果我能做到这样

I worked around it, but I'd still like to know if I can do it this way.

澄清：我无法从onclick事件调用JS，因为页面是在UpdatePanel里面，我只希望JS的当AJAX请求终止执行，它是由一个触发在页面上特定按钮。在服务器端，我设置了myLabel.Text一些文本，然后JS检查是否$（myLabel.CliendID）的innerHTML的不是空白，并触发JS。检查的innerHTML是我的解决方法，因为我无法弄清楚如何检查AJAX请求的发件人。希望这会更有意义吧。

Clarification: I can't call the JS from onclick event, because the page is inside of the UpdatePanel, and i only want the JS to execute when AJAX Request ends and it was triggered by one particular button on the page. On server side, i set the myLabel.Text to some text, and then js checks if the $(myLabel.CliendID)'s innerHTML is not blank and fires the js. checking the innerHTML is my work-around since i can't figure out how to check the "sender" of AJAX Request. Hope this makes more sense now.

EDIT2：我读过一些文档< /一>，并证明你可以检查发件人的控制。

edit2: I've read some documentation, and turns out you CAN check the "sender" control.

感谢你。

推荐答案

这是我在做什么在我的code，以确定哪些控制已初始化请求。所有的JavaScript code。

This is what I am doing in my code to identify what control has initialized the request. All javascript code.

function pageLoad() {
    if (!Sys.WebForms.PageRequestManager.getInstance().get_isInAsyncPostBack()) {
        Sys.WebForms.PageRequestManager.getInstance().add_endRequest(endRequestHandler);
        Sys.WebForms.PageRequestManager.getInstance().add_initializeRequest(initializeRequest);
    }
}
function endRequestHandler(sender, args) {
    if (sender._postBackSettings.sourceElement.id == '<%= gvResults.ClientID %>')        {
        //do something because of this...
    }
}
function initializeRequest(sender, args) {
    if (CheckForSessionTimeout()) {
        args.set_cancel(true);
    }
    else {
        if (sender._postBackSettings.sourceElement.id == '<%= gvResults.ClientID %>') {
             //do something because of this
        }
    }
}

修改
下面是检查超时在客户端的方法。

EDIT
Here is the method of checking for timeout on the client side.

var sessionTimeoutDateTime = new Date();
    var sessionTimeoutInterval = <%= this.SesstionTimeoutMinutes %>;

    function CheckForSessionTimeout() {
        var currentDateTime = new Date()
        var iMiliSeconds = (currentDateTime - sessionTimeoutDateTime);
        if (iMiliSeconds >= sessionTimeoutInterval) {
            ShowSessionTimeout();
            return true;
        }
        return false;
    }

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