Using TypeScript and HTML to toggle a switch and retrieve its value

I am currently trying to utilize a toggle switch to determine which methods need to be activated. My expectation is that I can obtain a Boolean value indicating whether the switch is turned on or off. However, I am unsure of how to retrieve this information.

To address this issue, I have incorporated a toggle switch in my HTML code:

<label class="switch">
 <input type="checkbox" id="ToggleswitchId" >
 <span class="slider round"></span>
</label>

Additionally, I have observed another individual accomplish something similar using JavaScript:

 var switchTrueFalse = document.getElementById('ToggleswitchId').checked

However, when attempting this method, I receive an error stating "Property 'checked' does not exist on type HTMLElement"

htmlcssangulartypescripttoggleswitch

Answer №1

verified is not a function. Rather, it is considered one of the attributes within the <input> element and functions as a boolean value.

Hence, utilizing 

document.getElementById('ToggleswitchId').checked
will yield true if the checkbox is checked.

Answer №2

checked is a property of checkbox input that can return either true or false.

function toggleCheckbox() {
  if (document.getElementById('ToggleswitchId').checked) {
    console.log("Checked")
  } else {
    console.log("Unchecked");
  }
}
<label class="switch">
 <input type="checkbox" id="ToggleswitchId" onClick="toggleCheckbox()" >call method
 <span class="slider round"></span>
</label>

Answer №3

When dealing with an input tag, consider implementing HTMLInputElement over HTMLElement.

Experiment with the following code to see if it resolves the issue:

(document.getElementById("ToggleswitchId") as HTMLInputElement).checked

Answer №4

To trigger a JavaScript function when a checkbox is checked or unchecked, you can use the following code:

function toggleSwitch() {
    var switchState = document.getElementById('ToggleswitchId').checked;
    console.log(switchState);
}
    
<label class="switch">
  <input type="checkbox" id="ToggleswitchId" onclick="toggleSwitch()" >
  <span class="slider round"></span>
</label>

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