Convert a passed form reference to a string formatted like a JavaScript array of objects
// Read the name, id, type, and value of one form control element
// as requested by form2ArrayString()
function formObj2String(obj) {
var output = "{";
if (obj.name) {
output += "name:'" + obj.name + "',";
}
if (obj.id) {
output += "id:'" + obj.id + "',";
}
output += "type:'" + obj.type + "',";
switch (obj.type) {
case "radio":
if (obj.name) {
obj = document.forms[0].elements[obj.name];
var radioVal = "value:false,index:-1";
for (var i = 0; i < obj.length; i++) {
if (obj[i].checked) {
radioVal = "value:true,index:" + i;
i = obj.length;
}
}
output += radioVal;
} else {
output += "value:" + obj.checked;
}
break;
case "checkbox":
output += "value:" + obj.checked;
break;
case "select-one":
output += "value:" + obj.selectedIndex;
break;
case "select-multiple":
output += "value:" + obj.selectedIndex;
break;
case "text":
output += "value:'" + escape(obj.value) + "'";
break;
case "textarea":
output += "value:'" + escape(obj.value) + "'";
break;
case "password":
output += "value:'" + escape(obj.value) + "'";
break;
case "hidden":
output += "value:'" + escape(obj.value) + "'";
break;
default:
output += "";
}
output += "}"
return output;
}
// Convert a passed form reference to a string formatted like
// a JavaScript array of objects
function form2ArrayString(form) {
var elem, lastName = "";
var output = "[";
for (var i = 0; i < form.elements.length; i++) {
elem = form.elements[i];
if (elem.name && (elem.name != lastName)) {
output += formObj2String(form.elements[i]) + ",";
lastName = elem.name;
}
}
output = output.substring(0, output.length-1) + "]";
return output;
}
// Distribute form control values from another source to the
// controls in this page's form, whose names/ids match those
// of the original form controls
function string2FormObj(form, str) {
var elem, objArray = eval(str);
for (var i = 0; i < objArray.length; i++) {
elem = (objArray[i].name) ? form.elements[objArray[i].name] : document.getElementById(objArray[i].id);
switch (objArray[i].type) {
case "radio":
if (objArray[i].name && objArray[i].value && objArray[i].index >= 0) {
elem = elem[objArray[i].index];
}
elem.checked = objArray[i].value;
break;
case "checkbox":
elem.checked = objArray[i].value;
break;
case "select-one":
elem.selectedIndex = objArray[i].value;
break;
case "select-multiple":
elem.selectedIndex = objArray[i].value;
break;
default:
elem.value = unescape(objArray[i].value);
}
}
}
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