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HMI
graph LR;
Root(HMI)-->A(Home);
Root-->B(Info);
Root-->C(Settings);
Root-->D(Log in);
A-->A1;
A-->A2;
A-->A3;
A-->A4;
A-->A5;
A-->A6;
B-->B1;
B-->B2;
B-->B3;
B-->B4;
B-->B5;
B-->B6;
C-->C1;
C-->C2;
C-->C3;
C-->C4;
C-->C5;
C-->C6;
D-->D1;
D-->D2;
D-->D3;
D-->D4;
D-->D5;
D-->D6;
click A4 callback
<script>
var callback = function(){
alert('A callback was triggered');
}
<script>