AngularJS ng-disabled not functioning properly when multiple conditions are used with && (and) and || (or) operators in the view

I'm in need of some assistance.

I've tried various methods to solve this issue, but I just can't seem to get both parameters working together.

Using a single parameter works fine for me.

This is my desired outcome: If the selection in my first drop down field is either Week or Month, then the next drop down field should be enabled.

As mentioned earlier; it works with a single parameter. For example:

ng-disabled="reportSettingsData.ReportFrequencyName.ReportFrequencyType != Enum.ReportFrequency.Monthly"

However, when I try to use an || (or) operator, it's not functioning at all:

ng-disabled="reportSettingsData.ReportFrequencyName.ReportFrequencyType != Enum.ReportFrequency.Monthly || reportSettingsData.ReportFrequencyName.ReportFrequencyType != Enum.ReportFrequency.Weekly"

Here are the two drop down fields on my view:

<!-- Frequency -->
    <div class="col-md-3">
        <label>Frequency</label>
        <div class="input-dropdown">
            <cc-dropdown cc-placeholder="Report Frequency"
                            ng-model="reportSettingsData.ReportFrequencyName"
                            ng-options="reportSettingsData.SelectableReportFrequencyNames"
                            ng-change="frequencyChanged()"
                            cc-fields="ReportFrequencyName"
                            cc-key-field="ReportFrequencyId"
                            cc-allow-search="reportSettingsData.SelectableReportFrequencyNames != null && reportSettingsData.SelectableReportFrequencyNames.length > 5"
                            name="iFrequencyName">
            </cc-dropdown>
        </div>
    </div>
    <div class="col-md-3">
        <label>Frequency Options</label>
        <div class="input-dropdown">
            <cc-dropdown cc-placeholder="Report Frequency Option"
                            ng-model="reportSettingsData.ReportFrequencySelectionName"
                            ng-options="reportSettingsData.SelectableReportFrequencySelectionNames"
                            ng-disabled="reportSettingsData.ReportFrequencyName.ReportFrequencyType != Enum.ReportFrequency.Monthly || reportSettingsData.ReportFrequencyName.ReportFrequencyType != Enum.ReportFrequency.Weekly"
                            cc-fields="ReportFrequencySelectionName"
                            cc-key-field="ReportFrequencySelectionId"
                            cc-allow-search="true"
                            name="iFrequencySelections">
            </cc-dropdown>
        </div>
    </div>

Thank you for your help!

Answer №1

After conducting further research and seeking assistance, I have arrived at the following solution:

I made a simple adjustment by replacing the || (or) operator with the && (and) operator.

ng-disabled="reportSettingsData.ReportFrequencyName.ReportFrequencyType != Enum.ReportFrequency.Weekly && reportSettingsData.ReportFrequencyName.ReportFrequencyType != Enum.ReportFrequency.Monthly"

Initially, one might expect the logical OR operator (||) to work, as it implies:

'Enable the field when either "this" or "that" applies'

However, due to my use of the NOT (!=) condition evaluation and the ng-disabled directive, the opposite behavior occurred (yes, I know, it was quite confusing!).

In essence;

'Disable the field when neither "this" nor "that" apply'

(at least that's how I interpret it - corrections are welcome!).

For a deeper understanding of || and && usage, consider these resources:

Here is a concise explanation:

JavaScript will short-circuit the evaluation once it determines whether a condition is True or False.

https://en.wikipedia.org/wiki/Short-circuit_evaluation

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators

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