12 lines
607 B
JavaScript
12 lines
607 B
JavaScript
/*
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this is thought for (de-/in)crement integer values in (e.g. input) form elements
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calling like
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<input type="input" value="++" onclick="crmnt(document.getElementById('id'),1)" />
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<input type="input" value="+=5" onclick="crmnt(document.getElementById('id'),5)" />
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<input type="input" value="-=5" onclick="crmnt(document.getElementById('id'),-5)" />
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<input type="input" value="--" onclick="crmnt(document.getElementById('id'),-1)" />
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*/
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function crmnt( e, i ) { /* read: in-/decrement ( dom-element, signed-integer ) */
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var d = parseInt( e.value ) + i;
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e.value = ( d <= 0 || isNaN(d) )? 0 : d;
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}
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