material design lite - How to focus an MDL TextField -

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what proper way focus material design lite textfield?

this works:

$("#mytextfield").focus();

this not work:

document.getelementbyid('mytextfield').parentnode.materialtextfield.focus();

however, similar code works disable textfield:

document.getelementbyid('mytextfield').parentnode.materialtextfield.disable();

you don't need jquery.

  input.focus();   input.parentnode.classlist.add('is-dirty');

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