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Implode Form Element Array

/ Published in: JavaScript
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I frequently pass an array of elements from an HTML form to PHP, normally a list of checkboxes for removing database records. This will loop through an array of checkbox's with the same name & build a delimited string from the checked values. After I have the values in a delimited string I normally have a hidden field which holds the string & explode it on the PHP side.

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  1. // implodeFormArray(form name : String, form element name : String, delimiter : String);
  2. function implodeFormArray(f, e, del) {
  3. 	var form	= document.forms[f];
  4. 	if (typeof(form.elements[e].value) != "undefined") {
  5. 		if (form.elements[e].checked) return form.elements[e].value;
  6. 		else return '';
  7. 	} else {
  8. 		var output	= '';
  9. 		var len		= form.elements[e].length;
  10. 		for(var i=0;i<len;i++) {
  11. 			if (form.elements[e][i].checked) {
  12. 				output+= (output == '' ? '':del) + form.elements[e][i].value;
  13. 			}
  14. 		}
  15. 		return output;
  16. 	}
  17. }

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