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2.4

How to use Javascript library stringForms.js

Asked by cpotridge in Dynamic HTML (DHTML), JScript, Document Object Model

Tags: Javascript, html forms, passing data between pages, stringForms.js, Javascript libraries

I have a multiple html forms on multiple web pages and need to create global variables for all data collected to be available to any of the pages.

I am trying to use a Javascript library, stringForms.js, to accomplish this. I keep getting the error "elements is null or not an object" in function string2FormObj(form, str) on the following line:

elem =( objArray[i].name) ?form.elements[objArray[i].name]:
document.getElementById(objArray[i].id);

What am I missing?

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             // 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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How to use Javascript library stringForms.js

Asked by cpotridge in Dynamic HTML (DHTML), JScript, Document Object Model

Tags: Javascript, html forms, passing data between pages, stringForms.js, Javascript libraries

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