in html, a form comprises of various elements which helps in making a user interface in a web page. using which we can collect different nature of nature.
One of the commonly used control is Month control i.e.
Executing the code given above, a month control will be displayed on the page.
When you click on the calendar icon on the right side of the control, it will open the complete month calendar like this −
一旦下拉菜单打开，您可以从日历中选择月份和年份，或者您可以在控件中输入月份和年份。
Once the month and year is selected, it will get stored in String type of value.
Let us create a program to display the selected month and year from the control using JavaScript.
Example
Admission Form function display(){ d=form1.doa.value; document.write("Date of Admission is "+d +""); }
In this program, we have used tag to write JavaScript code in which a function is created to display the selected month when onchange() event is triggered. onchange event will be fired when a date value is selected from the control. document.write() will display the value on the next page. We have displayed the date of admission in the formatted output by using formatting tags.
Admission Form function display(){ d=form1.doa.value; document.write("Date of Admission is "+d +""); }
We can also set the default value of month and year which should be displayed when the web page gets loaded in the browser. To do so, we can use value attribute in tag.
Example
Select a month:
Once this program is executed, it will show “December, 1980” as the default value in the month control.
In this program, you can observe that only December month (year 1980) is active and others are disabled and similarly when you type the year 1981, it will show you months upto November because we have set the range.
If user types the invalid month or year name, it will show an error message like this −
We can also make use of step attribute using which we can skip few months for the given year while setting the date range. Look at the example shown below of an event registration form where assuming that a particular event is falling under specific months.
Example
Live Concert Olympics in Beijing World Series(Baseball)
本教程深入探讨了使用JavaScript构建计算器时常见的数值显示异常问题，特别是由于类属性未初始化导致的`Cannot read properties of undefined`错误。我们将详细分析问题根源，并通过在构造函数中调用初始化方法来解决该问题，同时优化显示逻辑，确保计算器功能稳定且界面显…
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