JavaScript来验证在asp.net中开始日期和结束日期 [英] Javascript to validate start date and end date in asp.net

问题描述

我写了应该检查开始日期小于结束日期的JS。如果没有，警报应该抛出

I have written a JS that should check that start date is less than end date. If not, alert should be thrown

的JS写为;

function DateValidation(startDate, EndDate) {
                debugger;
                var stdate = startDate;
                var enddate = EndDate;
                if (stdate!= '' && enddate!='') {
                if (stdate > enddate) {
                    alert('Start date cannot be greater than end date');
                    return false;
                }
                else {
                    return true;
                }
               }
            }

当我点击一个按钮显示报告。

This JS gets fired when i am clicking a button as "Show Report".

问题是我面临的

1. JS不正确验证的日期。我在想什么？我传递日期从文本框

1. JS doesn't validate the date correctly. What am i missing? i am passing date from the textbox

在第一次点击按钮时，JS不解雇了。它激发点击按钮第二遍的时候

The JS doesn't fired up when clicking button for the first time. it fires when clicking the button second time

另外，我已经注册了JS如下;

Plus, i have registered the JS as below;

btnShowReport.Attributes.Add("onclick", "return DateValidation('" + txtStartDate.Text + "', '" + txtEndDate.Text + "');");

是上面code正确吗？什么是注册JS正确的位置？

Is the above code correct? What is the correct place to register the JS?

请指导..谢谢！

推荐答案

您需要将字符串值解析为日期

You need to parse the string values to dates

if (startDate!= '' && EndDate!='') {  
    var stdate = Date.parse(startDate);   
    var enddate = Date.parse(EndDate);  
    if (stdate > enddate) {   
        alert('Start date cannot be greater than end date');   
        return false;   
    }   
    else
    {   
        return true;   
    }   
} 

如果没有进一步的code这是很难说为什么你的按钮仅触发在第二次点击的事件。是您的按钮禁用下手？

Without further code it's hard to tell why your button only fires the event on the second click. Is your button disabled to start with?

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