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Create crementing.js 

function for in-/decrement on multiple templates, to be included in header somewhere
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Wolf 2015-04-12 19:18:02 +02:00
parent 937f653313
commit bcf418b9b5
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/*
this is thought for (de-/in)crement integer values in (e.g. input) form elements
calling like
<input type="input" value="++" onclick="crmnt(document.getElementById('id'),1)" />
<input type="input" value="+=5" onclick="crmnt(document.getElementById('id'),5)" />
<input type="input" value="-=5" onclick="crmnt(document.getElementById('id'),-5)" />
<input type="input" value="--" onclick="crmnt(document.getElementById('id'),-1)" />
*/
function crmnt( e, i ) { /* read: in-/decrement ( dom-element, signed-integer ) */
var d = parseInt( e.value ) + i;
e.value = ( d < 0 )? 0 : e.value = d;
}