What should be applied so a tick comes out on its own? - briefly
Apply the checked attribute to the element; this forces the checkmark to appear automatically. The attribute may be set in the HTML markup or programmatically via JavaScript.
What should be applied so a tick comes out on its own? - in detail
Applying the appropriate attribute or script causes the check mark to appear without user interaction. In HTML, the «checked» attribute forces a checkbox to render as selected when the page loads. Setting this attribute directly in the markup, for example «», ensures the tick is displayed immediately.
When dynamic behavior is required, JavaScript can modify the element’s «checked» property. The following steps achieve the effect:
- Access the target element via document.getElementById or a similar selector.
- Assign true to the checked property, e.g., document.getElementById('myBox').checked = true;.
- Optionally trigger a change event to notify listeners, using dispatchEvent(new Event('change')).
CSS alone cannot generate the tick; it can only style the appearance once the element is in a checked state. Therefore, the visual marker must be activated by either the HTML attribute or a script that sets the property.
In frameworks such as React, the defaultChecked prop or controlled checked prop provides the same functionality. For uncontrolled components, include defaultChecked={true} in the JSX. For controlled components, bind the checked attribute to a state variable and initialize that variable to true.
If the requirement concerns a custom UI element that mimics a checkbox, the implementation typically involves:
- Defining a Boolean state representing the selected condition.
- Rendering a tick icon conditionally based on that state.
- Initializing the state to true so the icon is present on first render.
Overall, the mechanism that guarantees an autonomous tick involves setting the checked condition at the source—either through the static «checked» attribute, a script that assigns the property, or framework-specific props that initialize the element as selected.