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JS Implement Dynamic Form method

Source: Internet
Author: User
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Using JavaScript to implement a relatively simple method, for all the form elements used only for display, to get their values, in the form of "key=value,key=value" stored in the database, only one text field in the database can be, when modified, from the database to get these values, The corresponding element is assigned a value according to the key.

Primarily using Data-skey custom attributes as key, form elements that support Select, textarea, and input type text, radio, checkbox

The code is as follows Copy Code
function Dynamicform (container) {
This.container = typeof (Container) = = ' String '? document.getElementById (container): container;
}
Dynamicform.prototype = {
_keyvaluesplitter: ' = ',
_itemsplitter: ', ',
_attrkey: ' Data-skey ',
_chktypes: [' checkbox ', ' Radio '],
_isintype:function (A, EL) {
var etype = El.type.toLowerCase ();
var i = a.length;
while (i--) {
if (a[i] = = etype) {
return true;
}
}
return false;
},
_addelement:function (array, tag, types) {
var el, nodes = this.container.getElementsByTagName (tag);
for (var i = 0, L = nodes.length i < l; i++) {
El = Nodes[i];
if (!types | | (Types && This._isintype (types, EL)) {
Array.push (EL);
}
}
},
_getelements:function () {
var ret = [];
This._addelement (ret, ' input ', [' Text '].concat (this._chktypes));
This._addelement (ret, ' textarea ');
This._addelement (ret, ' select ');
return ret;
},
/* Get the value of all elements * *
Getvalues:function () {
var Elarray = this._getelements (), ret = [], El, key, Ischk;
for (var i = 0, L = elarray.length i < l; i++) {
El = Elarray[i];
Key = El.getattribute (This._attrkey);
if (key) {
Ischk = This._isintype (This._chktypes, EL);
if ((!ischk && el.value) | | (Ischk && el.checked))
Ret.push (key + This._keyvaluesplitter + encodeuricomponent (el.value));
}
}
Return Ret.join (This._itemsplitter);
},
_setvalues:function (Val, Elarray, callback) {
if (!) ( val | | val.length)) return;
var Elen = elarray.length, Valarray = Val.split (this._itemsplitter), keyvalue;
for (var i = 0, L = valarray.length i < l; i++) {
KeyValue = Valarray[i].split (This._keyvaluesplitter);
Callback.call (This, Elarray, Elen, keyvalue);
}
},
/* Assign values to all elements (can be used to modify the page) * *
Setvalues:function (val) {
if (!) ( val | | val.length)) return;
This._setvalues (Val, this._getelements (), this._setelementvalue);
},
_setelementvalue:function (Elarray, Elen, keyvalue) {
var el, key = Keyvalue[0], val = decodeuricomponent (keyvalue[1]), Hasset;
for (var i = 0; i < Elen; i++) {
El = Elarray[i];
if (El.getattribute (this._attrkey) = = key) {
if (This._isintype (This._chktypes, el)) {
if (val = = El.value)
Hasset = el.checked = true;
}
else if (Val) {
El.value = val;
Hasset = true;
}
if (Hasset) {
Elarray.splice (i, 1);
Break
}
}
}
},
/* Used to display to the page (read only) * *
Showto:function (val, tag) {
if (!) ( val | | val.length)) return;
var ret = [];
This._addelement (ret, tag);
This._setvalues (Val, ret, this._showtoelement);
},
_showtoelement:function (Elarray, Elen, keyvalue) {
var el, key = Keyvalue[0], val = decodeuricomponent (keyvalue[1]), Hasset;
for (var i = 0; i < Elen; i++) {
El = Elarray[i];
if (El.getattribute (this._attrkey) = = key) {
el.innerhtml = val;
Elarray.splice (i, 1);
Break
}
}
}
};

Test code

The code is as follows Copy Code
<! DOCTYPE html>
<title></title>
<script src= "Dynamicform-compiled.js" ></script>
<script>
function SaveData () {
var f = new Dynamicform (' Form-wrapper ');
document.getElementById (' Hf1 '). Value = F.getvalues ();
}
function Restoredata () {
var f = new Dynamicform (' Form-wrapper ');
F.setvalues (document.getElementById (' hf1 '). Value);
}
function ShowData () {
var f = new Dynamicform (' View-wrapper ');
F.showto (document.getElementById (' hf1 '). Value, ' span ');
}
</script>
<body>
<form id= "Form1" runat= "Server" >
<div id= "Form-wrapper" >
<asp:literal runat= "Server" id= "View1"/>
</div>
<asp:hiddenfield id= "HF1" runat= "Server"/>
<asp:button id= "B1" runat= "Server" text= "Submit" onclick= "B1_click" onclientclick= "SaveData ()"/>
<input type= "button" value= "restore Form" onclick= "Restoredata ()"/>
<div id= "View-wrapper" >
<asp:literal runat= "Server" id= "View2"/>
</div>
</form>
</body>

asp.net code

The code is as follows Copy Code

public partial class Test_default:page
{
protected override void OnLoad (EventArgs e)
{
View1. Text = File.readalltext (Server.MapPath ("template-form.html"));
Base. OnLoad (e);
}

protected void B1_click (object sender, EventArgs e)
{
View2. Text = File.readalltext (Server.MapPath ("template-view.html"));
Clientscript.registerstartupscript (this. GetType (), Guid.NewGuid (). ToString (), "ShowData ();", true);
}
}

Template data for modification

  code is as follows copy code

Name: <input type=" text "data-skey=" name "/>
<br/>
Sex:
& Lt;input type= "Radio" name= "Rdo_group1" value= "male" data-skey= "gender"/> Male
<input type= "Radio" name= "Rdo_" Group1 "value=" female "data-skey=" gender "/> Female
<br/>
who can see:
<select data-skey=" seeing "
 & nbsp;  <option value= "" > Please select </option>
    <option value= "Anyone" > anyone </ Option>
    <option value= "only Friends" > Only friends </option>
    <option Value= "Confidential" > Confidential </option>
</select>
<br/>
Self-Introduction:
<textarea data-skey= "Intro" ></textarea>

Template file

The code is as follows Copy Code

Name: <span data-skey= "Name" ></span>
<br/>
Gender:
<span data-skey= "Gender" ></span>
<br/>
Who can see:
<span data-skey= "" "></span>
<br/>
Self Introduction:
<span data-skey= "Intro" ></span>

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