Angular - The 'options' property is not found in the 'HTMLOptionElement' type

Currently, I am attempting to modify the choices in a dropdown menu based on the selection made from another dropdown. This problem led me to come across a helpful resource on a website called "Form Select Change Dynamic List Option Elements Tutorial". However, as the tutorial is written in JavaScript, when implementing the code provided, I encountered an error message stating "Property 'options' does not exist on type 'HTMLOptionElement'". The code snippet causing this issue is displayed below:

changeWidget() {
    var roles = document.getElementById("roles") as HTMLOptionElement;
    var widgets = document.getElementById("widgets") as HTMLOptionElement;
    widgets.innerHTML = "";

    if (roles.value == "Startups") {
        var optionArray = ["|", "products|Products", "people|People", "matching|Matching"];

    }
    for (var option in optionArray) {
        var pair = optionArray[option].split("|");
        var newOption = document.createElement("option");
        newOption.value = pair[0];
        newOption.innerHTML = pair[1];
        widgets.options.add(newOption); 
    }
}

I am uncertain about the appropriate typecast that should be used in this scenario. Should it be HTMLElement, HTMLSelectElement, HTMLInputElement, or something else entirely?

angulartypescripthtml-select

Answer №1

To efficiently handle HTML select elements, consider utilizing the HTMLSelectElement and implementing the add() method for adding options dynamically.

changeWidget() {
    var roles = document.getElementById("roles") as HTMLSelectElement;
    var widgets = document.getElementById("widgets") as HTMLSelectElement;
    widgets.innerHTML = "";

    if (roles.value == "Startups") {
        var optionArray = ["|", "products|Products", "people|People", "matching|Matching"];

    }
    for (var option in optionArray) {
        var pair = optionArray[option].split("|");
        var newOption = document.createElement("option");
        newOption.value = pair[0];
        newOption.innerHTML = pair[1];
        widgets.add(newOption); 
    }
}

Answer №2

If you want to include an option widget, it must be in the form of an HTMLSelectElement with the selected item being an HTMLOptionElement.

updateWidget() {
    var roles = document.getElementById("roles") as HTMLOptionElement;
    var widgets = document.getElementById("widgets") as HTMLSelectElement;
    widgets.innerHTML = "";

    if (roles.value == "Startups") {
        var optionArray = ["|", "products|Products", "people|People", "matching|Matching"];

    }
    
    for (var option in optionArray) {
        var pair = optionArray[option].split("|");
        var newOption = document.createElement("option");
        newOption.value = pair[0];
        newOption.innerHTML = pair[1];
        widgets.options.add(newOption); 
    }
}

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