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Examples of DOM methods and attributes

Source: Internet
Author: User
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<% @ Page Language = "C #" AutoEventWireup = "true" CodeFile = "Default. aspx. cs" Inherits = "_ Default" %>

<! DOCTYPE html PUBLIC "-// W3C // dtd xhtml 1.0 Transitional // EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<Html xmlns = "http://www.w3.org/1999/xhtml">
<Head runat = "server">
<Title> DOM methods and attributes </title>
<Script language = "javascript">
Function AddElement ()
{
Var para = document. createElement ("p ");
Para. setAttribute ("title", "My paragraph ");
Var message = document. createTextNode ("hello world ");
Para. appendChild (message );
Document. getElementById ("container"). appendChild (para );

// Alert (para. nodeName); // P
// Alert (message. nodeName); // # text
// Alert (para. nodeType); // 1
// Alert (message. nodeType); // 3

// Var value = para. getAttribute ("title ");
// Alert (value );
}

Function CloneNode ()
{
Var para = document. createElement ("p ");
Para. setAttribute ("id", "p1 ");
Para. setAttribute ("title", "My paragraph ");
Var message = document. createTextNode ("hello world ");
Para. appendChild (message );
Document. getElementById ("container"). appendChild (para );

Var newpara = para. cloneNode (true );
// Alert (newpara. getAttribute ("id "));
Newpara. setAttribute ("id", "p2 ");
// Alert (newpara. childNodes [0]. nodeValue );
Document. getElementById ("container"). appendChild (newpara );
}

Function Analyse ()
{
Var sel = document. getElementById ("sel2 ");
Alert (sel. childNodes. length); // 6
Var NodesArray = sel. childNodes;
For (var I = 0; I <NodesArray. length; I ++)
{
// Alert (sel. childNodes [I]. nodeName );
If (I % 2! = 0) // 1 3 5
{
// Var _ value = sel. childNodes [I]. childNodes [0]. nodeValue;
// Var _ value = sel. childNodes [I]. getAttribute ("value ");
// Var _ value = NodesArray [I]. childNodes [0]. nodeValue;
Var _ value = NodesArray. item (I). childNodes [0]. nodeValue;
Alert (_ value );
}
Else
{
// Var value = sel. childNodes [I]. nodeValue;
// Alert (value );
}
}
}

Function RemoveChild ()
{
Var sel2 = document. getElementById ("sel2 ");
If (sel2.hasChildNodes)
{
Var firstoption = sel2.childNodes [1];
If (firstoption)
{
Var removednode = firstoption. parentNode. removeChild (firstoption );
Alert (removednode. childNodes [0]. nodeValue );
}
}
}

Function ReplaceChild ()
{
Var sel2 = document. getElementById ("sel2 ");
Var newoption = document. createElement ("option ");
Newoption. setAttribute ("value", "4 ");
Var text = document. createTextNode ("4 ");
Newoption. appendChild (text );

Var oldoption = sel2.replaceChild (newoption, sel2.childNodes [1]); // return oldoption

// Alert (oldoption. getAttribute ("value "));
}

Function CycleSelect1 () // traverse the drop-down list. Each option starts from the first one.
{
Var sel2 = document. getElementById ("sel2 ");
// Alert (sel2.tagName );

Var tempChild = null;
TempChild = sel2.firstChild;
While (tempChild)
{
If (tempChild. tagName = "OPTION ")
{
// Alert (tempChild. tagName );
Alert (tempChild. getAttribute ("value "));
}

TempChild = tempChild. nextSibling;
}
}
Function CycleSelect2 () // traverse the drop-down list. Each option starts from the last one.
{
Var sel2 = document. getElementById ("sel2 ");
// Alert (sel2.tagName );

Var tempChild = null;
TempChild = sel2.lastChild;
While (tempChild)
{
If (tempChild. tagName = "OPTION ")
{
// Alert (tempChild. tagName); // OPTION
// Alert (tempChild. nodeName); // OPTION
Alert (tempChild. getAttribute ("value "));
}

TempChild = tempChild. previussibling;
}
}

Function GetElementsByTagName ()
{
Var sel2 = document. getElementById ("sel2 ");
Var _ array = sel2.getElementsByTagName ("OPTION ");
For (var I = 0; I <_ array. length; I ++)
{
Var _ value = _ array. item (I). childNodes [0]. nodeValue;
Alert (_ value );
}
}

Function appendChildCutPaste () // cut and paste
{
Var sel2 = document. getElementById ("sel2 ");
Var child1 = sel2.getElementsByTagName ("OPTION"). item (0 );
Sel2.appendChild (child1 );
}

Function InsertBefore ()
{
Var sel2 = document. getElementById ("sel2 ");

Var _ text = sel2.options. length. toString ();

Var newoption = document. createElement ("option ");
Newoption. setAttribute ("value", _ text );
Var text = document. createTextNode (_ text );
Newoption. appendChild (text );

Sel2.insertBefore (newoption, sel2.lastChild );
}

Function InsertBeforeCutPaste ()
{
Var sel2 = document. getElementById ("sel2 ");
Sel2.insertBefore (sel2.options [0], sel2.lastChild );
}

Function insertAfter (newElement, targetElement) // insert a given node to the end of the subnode
{
Var parent = targetElement. parentNode;
If (parent. lastChild = targetElement)
{
Parent. appendChild (newElement );
}
Else
{
Parent. insertBefore (newElement, targetElement. nextSibling );
}
}

Function InsertAfter ()
{
Var sel2 = document. getElementById ("sel2 ");

Var _ text = sel2.options. length. toString ();

Var newoption = document. createElement ("option ");
Newoption. setAttribute ("value", _ text );
Var text = document. createTextNode (_ text );
Newoption. appendChild (text );

InsertAfter (newoption, sel2.lastChild );
}

Function InsertAfterCutPaste ()
{
Var sel2 = document. getElementById ("sel2 ");
InsertAfter (sel2.options [0], sel2.lastChild );
// InsertAfter (sel2.options [0], sel2.options [2]);
}
</Script>
</Head>
<Body>
<Form id = "form1" runat = "server">

<Input type = "button" value = "Submit" onclick = "AddElement ();"/>
<Input type = "button" value = "CloneNode" onclick = "CloneNode ();"/>
<Div id = "container">
</Div>
<Hr/>
<Select id = "sel1" multiple size = 1>
<Option selected value = 1> 1 </option>
<Option value = 2> 2 </option>
<Option value = 3> 3 </option>
</Select>
<Hr/>

<Select id = "sel2" size = "1">
<Option selected value = 0> 0 </option>
<Option value = 1> 1 </option>
<Option value = 2> 2 </option>
</Select> <br/>
<Input type = "button" value = "analysis" onclick = "Analyse ();"/>
<Input type = "button" value = "RemoveChild" onclick = "RemoveChild ();"/>
<Input type = "button" value = "ReplaceChild" onclick = "ReplaceChild ();"/>
<Input type = "button" value = "traverse the drop-down list. Each option starts from the first option." onclick = "CycleSelect1 ();"/>
<Input type = "button" value = "traverse the drop-down list. Each option starts from the last one." onclick = "CycleSelect2 ();"/>
<Input type = "button" value = "GetElementsByTagName" onclick = "GetElementsByTagName ();"/>
<Br/>
<Input type = "button" value = "appendChild cut and paste" onclick = "appendChildCutPaste ();"/>
<Input type = "button" value = "insertBefore" onclick = "InsertBefore ();"/>
<Input type = "button" value = "insertBefore cut and paste" onclick = "InsertBeforeCutPaste ();"/>
<Input type = "button" value = "insertAfter" onclick = "InsertAfter ();"/>
<Input type = "button" value = "insertAfter cut and paste" onclick = "InsertAfterCutPaste ();"/>
</Form>
</Body>
</Html>

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

Related Keywords:
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