The Vue method call within a v-for v-if combination is failing to produce the expected result

Currently, I have this specific code in my HTML file that utilizes a v-for loop to iterate over an array. For each entry, it calls a method with a parameter using a v-if directive to display the option tag only if the method evaluates to true.

Below is the snippet of the HTML code:

<template v-for="a in agencies">
<option v-if="agencyCk(a) === true" :value="a">${a}</option>
</template>

Here is the function defined in the Vue script section:

agencyCk: function(agency) {
        // Check object keys for matching name
        if (Object.keys(st.fullAgency).find(function(k) {
            // If name matches agency
            if (k === agency) {
                var obj = st.fullAgency[k];
                // Loop through an array for each value
                for (h in st.hosts) {
                    // If value matches object key's value
                    if (link === st.hosts[h]) {
                        return true;
                    } else {
                        return false;
                    }
                }
            }
        }));
    }

However, the current issue is that it seems to be returning all values as false.

Answer №1

The function agencyCk did not explicitly have a return value, so the function would default to returning undefined, which is considered false in JavaScript.

To understand why this happened, take a closer look at the if statement. Essentially, it can be simplified as:

if (Object.keys(...).find(...));

There is no code block associated with this if statement. The return statements you wrote apply to the find function, not the agencyCk function.

I believe what you intended to do was:

return Object.keys(...).find(...) != undefined

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