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Load external script within Ext JS 4

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Last Modified: 2015-05-02
Within Ext JS 4, I need to load D3 API. I am using the below code

	loadScript: function(callback, scope) {		console.log('5) loadScript called');      
		Ext.Loader.injectScriptElement('http://d3js.org/d3.v3.js', onLoad, onError);
	    console.log('D3 script loaded ');
    },


    onError : function() {
		console.log('On Error');
	},
	onLoad : function() {
		console.log('On Load');
		d3.select('body').append('div').style('position', 'absolute').style('padding', '0 10px').style('background', 'red').style('opacity', 0);
	},

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However, in browser console, I get the below error -

Uncaught ReferenceError: onLoad is not defined

Can someone please help me rectify the above code?

Thank you.
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