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getElementById and getElementByClassName

Last Modified: 2016-01-21
The snippet here checks to see if the browser is mobile then adds type="date" to the 2 specified input fields.
    if(isMobile ) {
            document.getElementById('date1').type = 'date';
	        document.getElementById('date2').type = 'date';
        } else {

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It works great.
Problem is I need to change the script to look for a class and not an id however I'm not having much look with he following
document.getElementsByClassName('date-pick').type = 'date';

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Would really like to get this working so assistance approciated
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