[英]Can I do a Date Check on a TextBox with a onBlur event?
I want to do a Date Check on a TextBox with a onBlur event. 我想使用onBlur事件在TextBox上执行日期检查。 I am not sure how to check the textbox in javascript on the aspx side.
我不确定如何在aspx端检查javascript中的文本框。 This is what I have so far
这就是我到目前为止
TodayDate= new Date();
function checkEnteredDate() {
if (document.getElementById('txtDate') > TodayDate) {
alert("You cannot select a date later than today.");
document.getElementById(TodayDate);
}
}
This is already a javascript function, I just cannot get the value in the textbox for a comparison. 这已经是一个javascript函数,我只是无法在文本框中获取值进行比较。 Any suggestions?
有什么建议么?
You could try passing the "this" to the function: 您可以尝试将“ this”传递给函数:
<asp:TextBox ID="Text1" onblur="CheckEnteredDate(this);" runat="server" />
Edit : Here's how the javascript function would use that (roughly): 编辑 :这是javascript函数将使用它的方式(大致):
function CheckEnteredDate(passed) {
if (new Date(passed.value) > new Date()) {
alert('Date greater than today');
}
}
If you're using Microsoft Ajax, Date parsing is already handled by the provided javascript reference libraries. 如果您使用的是Microsoft Ajax,则提供的javascript参考库已经处理了日期解析。
<asp:TextBox ID="Text1" onblur="CheckEnteredDate(this);" runat="server" />
Then on the function call: 然后在函数调用上:
function CheckEnteredDate(passed) {
var value = Date.parseLocale(passed.value, 'd');
if (isNaN(value))
alert('Not a valid date.');
if (value > new Date())
alert('You cannot select a date later than today.');
}
您应该只能够对此添加一个函数调用到文本框的onBlur事件。
When you pass textbox to document.getElementById, it returns an HTML object not the text inside the textbox. 当您将文本框传递给document.getElementById时,它将返回HTML对象,而不是文本框内的文本。 Use value property to get the value entered by the user.
使用value属性获取用户输入的值。 See below:
见下文:
function checkEnteredDate()
{
var inputDate = document.getElementById('txtDate');
if(inputDate == '')
{
alert('You must specify date.');
return false;
}
inputDate = new Date(inputDate);
var today = new Date();
today.setHours(0, 0, 0, 0); //By default today's date will have time portion as well.
if(inputDate > today)
{
alert('You can not select a date later than today');
return false;
}
return true;
}
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.