提示保存数据，如果和已更改时 [英] Prompt to save data if and when changes have been made

问题描述

我使用asp.net和我需要显示一个提示用户是否更改了该网页，他们不小心关闭了浏览器。

I am using asp.net and I need to display a prompt to the user if they have made changes to the web page, and they accidentally close down the browser.

页可能是从编辑个人资料任何一个提交索赔等。

The page could be anything from "Edit Profile" to a "Submit a Claim" etc.

如何可以显示消息框，确保其只显示如果更改了（而不是，更改用户，那么撤消 - 荷兰国际集团的变化，并关闭浏览器）

How can I can display the messagebox, ensuring that it is displayed only if changes have been made (as opposed to, the user making changes, then undo-ing the changes, and shutting down the browser)

推荐答案

我在过去做的是使用一些客户端脚本这onbeforeunload事件过程中执行此检查....

What I have done in the past is use some client side scripting which does this check during the onbeforeunload event....

var showPrompt=true;
var isDirty=false;
var hidePopup=false;

    function onBeforeUnload() {
        if (showPrompt) {
            if (isDirty) {
                if (hidePopup || confirm("Click ok to save your changes or click cancel to discard your changes.")) {
                    doSave();
                }
            }
        }
        showPrompt = true;
        hidePopup = false;
    }

• ShowPrompt可以设置为false，当你点击一个锚标记，不会浏览您离开页面。例如＆LT;一的onclick ='showPrompt =假HREF =JavaScript的：DOX（）'/＆GT;
• isDirty可以用来跟踪，当你需要保存的东西。例如，你可以做这样的事情 $（输入）的onchange（函数（）{isDirty = TRUE;}）; 来跟踪撤消的可能要替换isDirty一个函数，它会检查当前状态从上次保存的状态。
• HidePopup让我们强制保存不确认的用户。
• ShowPrompt can be set to false when your clicking on an anchor tag which won't navigate you away from the page. For example <a onclick='showPrompt=false' href='javascript:doX()'/>
• isDirty can be used to track when you need to save something. You could for example do something like $("input").onchange(function(){isDirty=true;}); To track undo's you might want to replace isDirty with a function which checks the current state from the last saved state.
• HidePopup lets us force a save without confirming to the user.

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