ASP.NET:如何使onClientClick在回发之前完成工作? [英] ASP.NET: how to make onClientClick finish work before postback?

问题描述

我有这样的控制权

<asp:Button ID="save_all_filt" runat="server" Text="All data for filtered subjects"
        OnClientClick="  a= saveAllFilt(); return true; "   onclick="save_all_filt_Click" />

saveAllFilt包含一个JQuery ajax调用.因此，我在日志中看到的是，我同时开始回发和saveAllFilt.但是，回发延迟"并且在saveAllFilt形式的Ajax调用之前不执行任何操作.

saveAllFilt contains a JQuery ajax call. So what I see in log, I have simultaneous start of postback and saveAllFilt. Postback however "delays" and does nothing before Ajax call in saveAllFilt fninshes.

我想知道是否有办法做到这一点: 1.在onClientClick上，系统进入saveAllFilt JS函数，然后以某种方式等待(！)直到Ajax函数完成. 2.只有完成后，才会发生真正的回发.

I wonder if there is a way to do like this: 1. onClientClick, system goes into saveAllFilt JS function and somehow waits(!) till Ajax function finishes in this or that way. 2. Only when it is finished, a real postback starts to happen.

我确实意识到JQuery ajax调用是事件驱动和异步的.只是想阻止这些回发操作直到完成(AJAX调用为通过服务器回发进行的检索准备数据).

I do realise that JQuery ajax call is event-driven and asynchronous. Just would like to block these postback actions till it finishes (AJAX call prepares data for retrieval that happens via server postback.)

推荐答案

设置 async属性到false的jQuery AJAX配置对象:

Set the async property of the jQuery AJAX config object to false:

$.ajax({
    /* ... */
    async : false
    /* ... */
})

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