Validating radio button checked

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Here Mudassar Ahmed Khan has explained with an example, how to get return value from Java Script function in Code Behind of ASP. Net web application using Hidden Field element in C# and VB.

The value will be returned from Java Script function to Code Behind of ASP.

Although I've used radio buttons in the last few examples, the same concepts can be applied to checkbox groups as well.

This page will walk through Angular 2 radio button and checkbox example.

To check for the possibility of the user leaving the entire group unchecked, an additional if statement only needs to test the variable "found_it" for a value of null. Remember - comparison operators compare two operands for equality. The not operator evaluates a null value in the same way it evaluates a false value, so it can be used to test found_it to see if it has been assigned a value.

The if/else can be constructed in two different ways using two different operators. To keep from becoming confused by the not operator, just think of it as a shorthand way of saying, "found_it==false".

That is because of here: function validate Radio Button List(radio Button List Id) { var list Item Array = Elements By Name(radio Button List Id); var is Valid = true; Change to: var is Valid = false; NC... One question how can i modify the function to check atleast one of the radiobutton list option is checked.

the Selected Value) and the inner HTML of the Label element (i.e.

<p> <input type="radio" value="male" name="gender" [ng Model]="user.gender" > Male <input type="radio" value="female" name="gender" [ng Model]="user.gender" > Female </p> <p> <input type="checkbox" name="tc" [ng Model]="TCAccepted" > </p> <form [form Group]="user Form" (ng Submit)="on Form Submit()"> <p> <input type="radio" value="male" form Control Name="gender"> Male <input type="radio" value="female" form Control Name="gender"> Female </p> <p> <input type="checkbox" form Control Name="tc"> </p> </form> <h3> Template Driven Form</h3> <p *ng If="is Valid Form Submitted" [ng Class] = "'success'"> Form submitted successfully.

</p> <form #user Form="ng Form" (ng Submit)="on Form Submit(user Form)"> <table> <tr> <td> Name:</td> <td> <input name="uname" [ng Model]="Name" required #uname="ng Model"> <div *ng If="uname.invalid && user Form.submitted && !

We will provide demo using template-driven form and reactive form.

Using both type of form we will see how to create radio button and checkbox, fetch values and set them checked and validate them.

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