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Javascript Articles
Page 446 of 534
How to perform Multiline matching with JavaScript RegExp?
To perform multiline matching, use the M modifier available in JavaScript Regular Expression.ExampleYou can try to run the following code to perform multiline matching − JavaScript Regular Expression var myStr = "Welcoming!"; var reg = /^ing/m; var match = myStr.match(reg); document.write(match);
Read MoreWhich is the JavaScript RegExp to find any alternative text?
To match any of the specified alternatives, follow the below-given pattern −(foo|bar|baz)ExampleYou can try to run the following code to find any alternative text − JavaScript Regular Expression var myStr = "one,one,one, two, three, four, four"; var reg = /(one|two|three)/g; var match = myStr.match(reg); document.write(match);
Read MoreHow can I write a script to use either W3C DOM or IE 4 DOM depending on their availability?
If you want to write a script with the flexibility to use either W3C DOM or IE 4 DOM depending on their availability, then you can use a capability-testing approach that first checks for the existence of a method or property to determine whether the browser has the capability you desire.The following is the code snippet showing the same −if (document.getElementById) { // If the W3C method exists, use it } else if (document.all) { // If the all[] array exists, use it } else { // Otherwise use the legacy DOM }
Read MoreWhat is the role of throw statement in JavaScript?
Use the throw statement to raise your built-in exceptions or your customized exceptions. Later these exceptions can be captured and you can take appropriate action.ExampleYou can try to run the following code to implement throw statement − Click the following to see the result:
Read MoreHow can I access document properties using Legacy DOM method in JavaScript?
To access document properties using Legacy DOM method in JavaScript, you can try to run the following code −Example Document Title This is main title Click the following to see the result:
Read MoreHow objects are organized in a web document? How is it arranged in a hierarchy?
The Objects are organized in a hierarchy. This hierarchical structure applies to the organization of objects in a Web document.Window object − Top of the hierarchy. It is the utmost element of the object hierarchy.Document object − Each HTML document that gets loaded into a window becomes a document object. The document contains the contents of the page.Form object − Everything enclosed in the ... tags sets the form object.Form control elements − The form object contains all the elements defined for that object such as text fields, buttons, radio buttons, and checkboxes.The following is a simple hierarchy of a ...
Read MoreWhat are the document methods supported by Legacy DOM?
The following is the list of document methods supported by Legacy DOM −Sr.NoProperty & Description1clear( )Deprecated − Erases the contents of the document and returns nothing.Ex − document.clear( )2close( )Closes a document stream opened with the open( ) method and returns nothing.Ex − document.close( )3open( )Deletes existing document content and opens a stream to which new document contents may be written. Returns nothing.Ex − document.open( )4write( value, ...)Inserts the specified string or strings into the document currently being parsed or appends to document opened with open( ). Returns nothing.Ex − document.write( value, ...)5writeln( value, ...)Identical to write( ), except that ...
Read MoreWhat is the role of special characters in JavaScript Regular Expressions?
The frequency or position of bracketed character sequences and single characters can be denoted by a special character. Each special character has a specific connotation. The +, *, ?, and $ flags all follow a character sequence.Sr.NoExpression & Description1p+It matches any string containing one or more p's.2p*It matches any string containing zero or more p's.3p?It matches any string containing at most one p.4p{N}It matches any string containing a sequence of N p's5p{2, 3}It matches any string containing a sequence of two or three p's.6p{2, }It matches any string containing a sequence of at least two p's.7p$It matches any string with p ...
Read MoreHow to access document properties using W3C DOM method?
This IE4 document object model (DOM) introduced in Version 4 of Microsoft's Internet Explorer browser. IE 5 and later versions include support for most basic W3C DOM features.ExampleTo access document properties using W3C DOM method, you can try to run the following code − Document Title This is main title Click the following to see the result:
Read MoreHow to get the list of document properties which can be accessed using W3C DOM?
The following are the document properties which can be accessed using W3C DOM −Sr.NoProperty & Description1BodyA reference to the Element object that represents the tag of this document.Ex − document.body2DefaultViewIts Read-only property and represents the window in which the document is displayed.Ex − document.defaultView3DocumentElementA read-only reference to the tag of the document.Ex − document.documentElement8/31/20084ImplementationIt is a read-only property and represents the DOMImplementation object that represents the implementation that created this document.Ex − document.implementation
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