Using Angular for creating visually appealing SVG graphics

I am completely new to AngularJS and I seem to be having some trouble understanding why Angular doesn't seem to play well with <svg> elements. Whenever I attempt to activate SVG elements using Angular, console errors come up. For example, within a directive, I have the following template:

<svg xmlns='http://www.w3.org/2000/svg' class='svgtime'>\
  <path stroke='#fff' stroke-width='5' d='M {{radius+line_size}} 2.50000119262981 A    {{radius+line_size-2.5}} {{radius+line_size-2.5}} 0 1 1 {{radius+line_size-0.1}} 2.500055466403296 Z' fill='transparent'></path>
  <path fill='transparent' stroke='#9BC7F2' stroke-width='2' ng-attr-d='M 60 2  A  58 58 0 0 1 77.83716831288882 5.497827994417321'></path>

I've set the radius variable within the directive scope, but this code just won't work. The console keeps pointing out that there is an invalid value for the d attribute of the path element. I've even tried using ng-attr-d as suggested in the official Angular directives documentation, but it didn't do the trick either. What's causing this issue? Could it be something related to how Angular replaces {{}} placeholders with actual values within SVG elements? Perhaps when Angular does its magic after rendering <svg>, errors arise? I'm aware of hacks like: How to prevent AngularJS from changing HTML attributes to lowercase. But then why doesn't ng-attr-* work as expected?

javascriptangularjssvg

Answer №1

After my research, I came to the realization that SVG attributes cannot be directly used with data-bindings in AngularJS. The workaround is to create a custom directive for handling these custom attributes. By modifying the custom attribute, you can effectively change the corresponding attribute within the SVG element. For instance:

tester.directive("svgD", function() {
return {
    scope : {
        "svgD" : '@'
    },

    link: function(scope,element, attr) {
            attr.$observe("svgD",function() {
               attr.$set("d",scope.svgD );
            });
    }

}

By implementing this solution, it resolves a similar issue discussed in How to prevent AngularJS from making lowercase HTML attributes. It raises the question as to why this specific behavior occurs when working with SVG.

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