In TypeScript, the Select element does not contain an options property

Having trouble iterating through a TypeScript array. Here are the methods I'm using:


getNotification(evt: string, rowIndex: number) {
    console.log("Production order: law has changed to " + evt + " " + rowIndex);
    var select = document.getElementsByName("ProductId-" + rowIndex);

    this.removeOptions(select);

    if ((evt != null) && (evt != "")) {
        let productsByLaw: IProduct[];

        productsByLaw = this.products.filter(x => x.lawId == +evt);
        for (let product in productsByLaw) {
            select.options[select.options.length] = new Option(product.name, product.productid);
        }
    }

}

removeOptions(selectbox : any) {
    var i;
    for (i = selectbox.options.length - 1; i >= 0; i--) {
        selectbox.remove(i);
    }
}

I'm unsure about

var select = document.getElementsByName("ProductId-" + rowIndex);
as the proper way to retrieve an html select. When trying
select.options[select.options.length]
, I encounter this compiler time error:

Error TS2339 (TS) Property 'options' does not exist on type 'NodeListOf'.

Is there a better approach to getting a select element in TypeScript?

Answer №1

Consider implementing the following modifications on the specified lines.

//line 3
var chosen = (document.getElementsByName("ProductId-" + rowIndex)[0]);

clearChoices(selectbox : any) {
    var j;
    for (j = selectbox.length - 1; j >= 0; j--) {
        selectbox.remove(j);
    }
}')[0];

Answer №2

One of my go-to methods is utilizing the HTMLSelectElement in my code.

getNotification(evt: string, rowIndex: number) {
    let id: string = "ProductId-" + rowIndex;

    let select: HTMLSelectElement = <HTMLSelectElement>document.getElementById(id);

    this.removeOptions(select);

    if ((evt != null) && (evt != "")) {
        let productsByLaw: IProduct[];

        productsByLaw = this.products.filter(x => x.lawId == +evt);
        for (let product of productsByLaw) {
            select.options[select.options.length] = new Option(product.name, product.productId.toString());
        }
    }
}

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