Organiccat Organiccat - 7 months ago 23
Javascript Question

Binding array to directive variable in AngularJS

I'm trying to get an array into a template so I can use the individuals values thereof. My problem is that the attribute turns into a string once inside my template so it's no longer accessible as {{var[0]}} and that will instead return the first character of the "string", usually "["

Here is a simplified setup of the data:

"varForward": ["100", "1"],
"varBack": ["1", "100"]


Here is a simplified portion of the HTML file that interacts with that data:

<my-customer-vars value="{{varForward}}">
</address-numbers>
<my-customer-vars value="{{varBack}}">
</address-numbers>


and lastly here is a portion that is SUPPOSED to replace the custom tag with my own stuff:

directive('myCustomerVars', function($compile) {
return {
restrict: 'E',
scope: {
value: "@"
},
template:
'<div>'+
'<p class="body-text">Some stuff goes here</p>'+
'<input type="text" name="firstinput" value="{{value[0]}}"> - '+
'<input type="text" name="secondinput" value="{{value[1]}}">'+
'</div>',
replace: true
}
});


So here I am, if I try using value[0] I get [ If I try to get value[1] I get " and so on. Is there any help on using arrays inside the template of a directive?

Answer

You need to change the "@" into "=" and to pass in the array without the {{ }}

like this:

<my-customer-vars value="varForward">
    </my-customer-vars>
<my-customer-vars value="varBack">
    </my-customer-vars>

directive:

directive('myCustomerVars', function($compile) {
    return {
        restrict: 'E',
        scope: {
            value: "="
        },
        template:
        '<div>'+
          '<p class="body-text">Some stuff goes here</p>'+
          '<input type="text" name="firstinput" value="{{value[0]}}"> - '+
          '<input type="text" name="secondinput" value="{{value[1]}}">'+
        '</div>',
        replace: true
    }
});

This is happening because every expression inside a directuve attribute defined by a @ gets evaluated as only as a string, and in the other way it gets evaluated as binding expression. (with 2 way binding, so be careful).

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