mathquill latex- how can I move cursor (selection) by code?

问题

I am using mathquill lib (mathquill git) and I am trying to make a keypad and a backspace using html buttons but I can't figure out how to move the cursor throw the formula.

Thanks,

回答1:

You can trigger custom keydown event on textarea within mathquill to move cursor through formula.

var customKeyDownEvent = $.Event('keydown');

customKeyDownEvent.bubbles = true;
customKeyDownEvent.cancelable =true;
customKeyDownEvent.charCode = 37;  // 37 for left arrow key
customKeyDownEvent.keyCode = 37;   
customKeyDownEvent.which = 37;

$('.mathquill-editable textarea').trigger(customKeyDownEvent);

Use charCode / keyCode / which are:

1. 37 for left arrow key
2. 39 for right arrow key

Thanks.

来源：https://stackoverflow.com/questions/27342276/mathquill-latex-how-can-i-move-cursor-selection-by-code