Why is there a rendering error when using a template for an SVG element in Angular?

<html ng-app="vg">

  <body>
  
    <justsvg width="100" height="25"></justsvg>
    

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.4.11/d3.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<script>
    var app = angular.module('vg', []);
    app
.directive("justsvg", function(){
    return {
        restrict:"AE",
        scope:{
            width: "@",
            height: "@"
        },
        template: "<svg width='{{width}}' height='{{height}}'></svg>"
    }
})
    
    </script>
    
    
  </body>
  
  </html>

All:

I am a beginner with Angular, and when trying to display SVG in a directive, I keep encountering an error like this:

<svg> attribute width: Expected length, "{{width}}".

My code is straightforward:

.directive("justsvg", function(d3){
    return {
        restrict:"AE",
        scope:{
            width: "@",
            height: "@"
        },
        template: "<svg width='{{width}}' height='{{height}}'></svg>"
    }
})

This is how I use it:

<justsvg data=data width="100" height="25"></justsvg>

I'm curious as to why even this basic usage is still causing an error? Also, can someone guide me on how to debug this type of error?

An intriguing observation is that despite the error message, the SVG still renders correctly

Answer №1

To modify your code, change the = to @.

= - represents a two-way binding where you must pass a variable
@ - signifies a one-way binding where you pass a text value.

Remember to enclose width and height values with '.

Initial Version

Use ng-width and ng-height

template: "<svg ng-width='{{width}}' ng-height='{{height}}'></svg>"

Updated Version

.directive("justsvg", function(d3){
    return {
        restrict:"AE",
        scope:{
            data: "=",
            width: "@",
            height: "@"
        },
        template: "<svg></svg>",
        link: function ($scope, $element) {
                $element.attr('width', $scope.width);
                $element.attr('height', $scope.height);
        }
    }
})

In the function, ensure that the parameter named d3 corresponds to a defined service. Otherwise, remove it to prevent potential errors.

For further information, visit: https://docs.angularjs.org/guide/interpolation

Answer №2

It appears that the issue lies in not enclosing {{}} with quotes. The correct template format should be:

template: "<svg width='{{width}}' height='{{height}}'></svg>"

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