javascript – 如何在AngularJS中获取这个D3.js HTML元素,以便我可以操作它？

2019年7月20日 110次阅读

我正在尝试使用
D3.js图形库为我的网页上的Javascript绘制图形.我可以使用HTML在SVG上绘制一条灰线.我可以在我在J​​avascript中创建的新SVG容器上使用Javascript绘制一条红线.但我无法弄清楚如何在HTML中创建的SVG元素上绘制readline.

我尝试了var svgContainer = document.getElementById(“my_svg_widget”),但是没有用.

如何在已在HTML文件中声明的SVG元素上绘制红线(与灰线的端点相同)

这是Plunker：https://plnkr.co/edit/F6deVZU3NNADOeIdC5Iy?p=preview

以下是我的文件供您参考.

使用Javascript：

myApp = angular.module('myApp', ['ui.router'] );

myApp.config(function($stateProvider, $urlRouterProvider, $locationProvider) {
    $stateProvider.state('myState', {url: '/myState', params: {slug: {value: null, squash: true} }, templateUrl: 'my-state-page1.html', controller: 'MyStateCtrl'} );
  } 
);

myApp.controller('MyStateCtrl', function($scope, $http) {
      var self = this;

      $scope.$watch(function() {return self.myDataFromAPI}, function (objVal) {
          console.log('objVal = ', objVal);
          x = objVal.origin.split('.');
          console.log("X = ", x)

          var svgContainer = d3.select("body") 
                               .append("svg") 
                               .attr("width", 1000) 
                               .attr("height", 1000); 

          var line = svgContainer.append("line") 
                                 .attr("x1", 0) 
                                 .attr("y1", 0) 
                                 .attr("x2", Number(x[2])) 
                                 .attr("y2", Number(x[3])) 
                                 .attr("stroke-width", 2) 
                                 .attr("stroke", "red");
        },
        true
      );


      self.httpFailure = function(response) {
        console.log('Failure');
        self.myDataFromAPI = null;
      }

      self.httpSuccess = function(response) {
        console.log('\n\n\nGot the data from the API!');
        self.myDataFromAPI = response.data;
        console.log('\n\n\self.myDataFromAPI =', self.myDataFromAPI);
      }

      $http.get(
        'https://httpbin.org/get'
      ).then(self.httpSuccess, self.httpFailure);
    }
);


myApp.directive('mypMyDirective',function(){
    return {
      restrict:'E',
      scope: {
        myDataFromAPI: '='
      },
      controller: 'MyStateCtrl',
      controllerAs: 'myStateCtrl',
      bindToController: true,
      templateUrl: 'myD3Diagram.html'
    };
  }
);

index.html的：

<!DOCTYPE html>
<html ng-app="myApp">
  <head>
    <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/angular-ui-router/0.2.18/angular-ui-router.js"></script>
    <script src="http://d3js.org/d3.v3.min.js" charset="utf-8"></script>
    <link rel="stylesheet" href="style.css" />
    <script src="script.js"></script>
  </head>

  <body>
    HELLO!
    <div ng-controller="MyStateCtrl as myStateCtrl">
      <myp-my-directive mydatafromapi="myStateCtrl.myDataFromAPI"></myp-my-directive>
    </div>
  </body>
</html>

myD3Diagram.html：

<svg id="my_svg_widget" width="500" height="500">
  <line x1="5" y1="5" x2="40" y2="40" stroke="gray" stroke-width="5"  />
</svg>

最佳答案 在这里,每次调用watch函数时,你都会附加一个新的svg.

var svgContainer = d3.select("body") 
                               .append("svg") 
                               .attr("width", 1000) 
                               .attr("height", 1000);

在你的watch函数中正确的方式而不是创建一个新的svg只需要选择d3.select(“svg”)或d3.select(“#my_svg_widget”)来获取svg已经存在并向其添加行.

 $scope.$watch(function() {return self.myDataFromAPI}, function (objVal) {
          console.log('objVal = ', objVal);
          x = objVal.origin.split('.');
          console.log("X = ", x)

          var svgContainer = d3.select("svg");


          var line = svgContainer.append("line")
                         .attr("x1", 0)
                         .attr("y1", 0)
                         .attr("x2", Number(x[2]))
                         .attr("y2", Number(x[3]))
                         .attr("stroke-width", 2)
                         .attr("stroke", "red");

        },
        true
      );

工作代码here

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