Dealing with checkbox's checked and unchecked events using JavaScript

Question

Dealing with checkbox's checked and unchecked events using JavaScript

I am facing a challenge with a read-only textbox used for date input from a JavaScript date picker. Additionally, I have a gridview with checkboxes in the item template. My goal is to have the corresponding date filled in the textbox when a user clicks on a checkbox in the grid. If they uncheck the box, the textbox should be cleared. Furthermore, if the textbox already contains a date and the user selects a date from the date picker, the selected date should replace the existing one in the textbox and the checkbox selection should be cleared. I'm unsure how to manage all of these interactions. Can anyone provide guidance?

javascript asp.net

Answer 1

Answer №1

<p>Here is an example of a checkbox with associated JavaScript function:</p>

<input type="checkbox" id="check_box_id" onclick="toggleCheckbox(this)" />

<script type="text/javascript">
function toggleCheckbox(checkbox){
  var isChecked = checkbox.checked;
  if (isChecked){
    // Perform actions when checkbox is checked
  }else{
    // Perform actions when checkbox is unchecked
  }
}
</script>

Answer 2

<p>Here is an example of a checkbox with associated JavaScript function:</p>

<input type="checkbox" id="check_box_id" onclick="toggleCheckbox(this)" />

<script type="text/javascript">
function toggleCheckbox(checkbox){
  var isChecked = checkbox.checked;
  if (isChecked){
    // Perform actions when checkbox is checked
  }else{
    // Perform actions when checkbox is unchecked
  }
}
</script>

Answer 3

Answer №2

Within a GridView, each checkbox and text box has a unique identifier. This can be seen in the following example:

For row 1, the checkbox id is similar to: gridname checkboxname_1 The text box id for row 1 looks like: txtname checkboxname_1

For row 2, the checkbox id is structured as: gridname checkboxname_2 And the text box id for row 2 appears as: txtname checkboxname_2

To create an onclick event for the checkbox that passes both the id and the value of the checkbox, follow this format:

onclick(this.id, checked/unchecked).

On the JavaScript side, extract the passed id (e.g., gridname checkboxname_1) and use the substring method to determine the row number (extract the last number such as 1 or 2).

Then, based on this number, construct the corresponding text box id by appending it to txtname checkboxname_. This will give you access to the current text box element.

You can then utilize document.getElementById(resultantid) to manipulate the text box when the checkbox value changes. Note that the checkbox status is also being passed, allowing you to apply conditional logic. For instance:

if(status === 'checked') {
    getElementById(resultantid).clear();
}

Answer 4

Within a GridView, each checkbox and text box has a unique identifier. This can be seen in the following example:

For row 1, the checkbox id is similar to: gridname checkboxname_1 The text box id for row 1 looks like: txtname checkboxname_1

For row 2, the checkbox id is structured as: gridname checkboxname_2 And the text box id for row 2 appears as: txtname checkboxname_2

To create an onclick event for the checkbox that passes both the id and the value of the checkbox, follow this format:

onclick(this.id, checked/unchecked).

On the JavaScript side, extract the passed id (e.g., gridname checkboxname_1) and use the substring method to determine the row number (extract the last number such as 1 or 2).

Then, based on this number, construct the corresponding text box id by appending it to txtname checkboxname_. This will give you access to the current text box element.

You can then utilize document.getElementById(resultantid) to manipulate the text box when the checkbox value changes. Note that the checkbox status is also being passed, allowing you to apply conditional logic. For instance:

if(status === 'checked') {
    getElementById(resultantid).clear();
}

Dealing with checkbox's checked and unchecked events using JavaScript

Answer №1

Answer №2

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