How can I modify URL parameters and specify defaults using JavaScript?

Change URL Parameters and Specify Defaults Using JavaScript

Problem:

You need to modify the 'rows' URL parameter in a given URL to a specific value or add it with a default value if it doesn't exist.

Solution:

Use JavaScript functions like updateURLParameter to manipulate URL parameters. Here's an extended version of the code provided in the problem answer:

/**
 * http://stackoverflow.com/a/10997390/11236
 */
function updateURLParameter(url, param, paramVal) {
    let newAdditionalURL = "";
    const tempArray = url.split("?");
    const baseURL = tempArray[0];
    let additionalURL = tempArray[1];
    let temp = "";

    if (additionalURL) {
        const additionalURLArray = additionalURL.split("&");
        additionalURLArray.forEach((paramValue) => {
            if (paramValue.split('=')[0] != param) {
                newAdditionalURL += temp + paramValue;
                temp = "&";
            }
        });
    }

    const rows_txt = temp + "" + param + "=" + paramVal;
    return baseURL + "?" + newAdditionalURL + rows_txt;
}

// Function Calls:
const newURL1 = updateURLParameter(window.location.href, 'locId', 'newLoc');
const newURL2 = updateURLParameter(newURL1, 'resId', 'newResId');

window.history.replaceState('', '', updateURLParameter(window.location.href, "param", "value"));

Updated Version Handling URL Anchors:

function updateURLParameter(url, param, paramVal) {
    let TheAnchor = null;
    let newAdditionalURL = "";
    const tempArray = url.split("?");
    const baseURL = tempArray[0];
    let additionalURL = tempArray[1];
    let temp = "";

    if (additionalURL) {
        const tmpAnchor = additionalURL.split("#");
        TheParams = tmpAnchor[0];
        TheAnchor = tmpAnchor[1];
        if (TheAnchor) additionalURL = TheParams;

        const tempArray = additionalURL.split("&");

        tempArray.forEach((paramValue) => {
            if (paramValue.split('=')[0] != param) {
                newAdditionalURL += temp + paramValue;
                temp = "&";
            }
        });
    } else {
        const tmpAnchor = baseURL.split("#");
        TheParams = tmpAnchor[0];
        TheAnchor = tmpAnchor[1];

        if (TheParams) baseURL = TheParams;
    }

    if (TheAnchor) paramVal += "#" + TheAnchor;

    const rows_txt = temp + "" + param + "=" + paramVal;
    return baseURL + "?" + newAdditionalURL + rows_txt;
}

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