Iterating through checkboxes in javascript

Question

I have 3 HTML lists that I am trying to iterate through check which options are selected and pass the inner HTML to the web service. The first table id="colorList" is passing the variables through correctly but amount and consistency are not, I can't see what I'm doing wrong. I've tried creating different functions but it didn't work.

The JavaScript code below:

function iterateCheckBoxList(listname) {
    var checkBoxListId = listname;
    var elementRef = document.getElementById(checkBoxListId);
    var checkBoxArray = elementRef.getElementsByTagName('input');
    var checkedValues = '';
    for (var i = 0; i < checkBoxArray.length; i++) {
        var checkBoxRef = checkBoxArray[i];
        if (checkBoxRef.checked == true) {
            var labelArray = checkBoxRef.parentNode.getElementsByTagName('span');
            if (labelArray.length > 0) {
                if (checkedValues.length > 0) checkedValues += ',';
                checkedValues += labelArray[0].innerHTML;
            }
        }
    }
    return checkedValues;
}

function updateSymptoms() {
    Parse.initialize("v9s5EdsZ4u9fSfTpr8SD0u3Xcb56nen1GWge47kV", "fjuiNrsJk3AubBY1zDfosLKDoPxzGgKlUxegxbtx");
    var UsualSymptoms = Parse.Object.extend("UsualSymptoms");
    var query = new Parse.Query(UsualSymptoms);
    query.equalTo("PatientID", getUserID());
    query.find({
        success: function (results) {
            var object = results[0];
            object.set("SputumColour", iterateCheckBoxList("colourList"));
            object.set("SputumAmount", iterateCheckBoxList("amountList"));
            object.set("SputumConsistency", iterateCheckBoxList("consistencyList"));
            object.save(null, {
                success: function (object) {
                    // The object was saved successfully.
                },
                error: function (object, error) {
                    // The save failed.
                    // error is a Parse.Error with an error code and description.
                    alert('PARSE didnt work');
                    console.log(error);
                }
            });
        },
        error: function (error) {
            alert("Error: " + error.code + " " + error.message);
        }
    });
}

The HTML Code is below:

<div class="sputumDetails" style="display:none" id="checkboxdiv">
    <h2>Colour</h2>

    <ul id="colourList" class="lists">
        <li><span>Clear</span>
            <input id="Clear" type="checkbox" class="checkbox" />
        </li>
        <li><span>White</span>
            <input id="White" type="checkbox" class="checkbox" />
        </li>
        <li><span>Yellow</span>
            <input id="Yellow" type="checkbox" class="checkbox" />
        </li>
        <li><span>Green</span>
            <input id="Green" type="checkbox" class="checkbox" />
        </li>
    </ul>
    <h2>Consistency</h2>

    <ul id="consistencyList" class="lists">
        <li>Watery
            <input type="checkbox" class="checkbox" />
        </li>
        <li>Sticky
            <input type="checkbox" class="checkbox" />
        </li>
    </ul>
    <h2>Amount</h2>

    <ul id="amountList" class="lists">
        <li>1 Teaspoon
            <input type="checkbox" class="checkbox" />
        </li>
        <li>1 Eggcup
            <input type="checkbox" class="checkbox" />
        </li>
        <li>Half a cup
            <input type="checkbox" class="checkbox" />
        </li>
        <li>1 Cup
            <input type="checkbox" class="checkbox" />
        </li>
    </ul>
</div>
<div id="nextSection">
    <input onclick="updateSymptoms()" type="button" class="next" value="Next" />
    <br/>
    <br/>
    <br/>
</div>

The onclick method is updateSymptoms() called by a button.

Thanks

What does the console say about the error?

Derek 朕會功夫
– Derek 朕會功夫

2013-01-02 22:54:59 +00:00
Commented Jan 2, 2013 at 22:54 — Derek 朕會功夫
– Derek 朕會功夫, Commented Jan 2, 2013 at 22:54

idrumgood · Accepted Answer · 2013-01-02 22:56:46Z

1

It's because you're looking for innerHTML inside a span.

var labelArray = checkBoxRef.parentNode.getElementsByTagName('span');

amountList and consistencyList don't have spans inside them.

Just wrap those labels in a span tag like you did in the colourList and you'll be good.

answered Jan 2, 2013 at 22:56

idrumgood

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