JavaScript Very Frequently Asked Questions FAQ

You are here: irt.org | FAQ | JavaScript | Very Frequently Asked Questions

FAQ 1 How do you check if a date is valid?
FAQ 6 How do you display the .00, or in the case of 50 cents display .50 instead of .5?
FAQ 13 How can I password protect a page?
FAQ 19 How do I read data from an input file?
FAQ 25 How can you find information about the contents of another frame?
FAQ 42 How do I detect the version of JavaScript the users browser supports?
FAQ 43 How do I detect the browser the user is using?
FAQ 80 How can I pass checkbox or radio value to another page?
FAQ 101 How can I read and write to a text file?
FAQ 106 Looking for a good simple JavaScript counter?
FAQ 109 I am thinking of learning JavaScript as it would appear to be extremely useful and effective. However, I have no previous programming experience other than HTML. Do you think this is feasible or is it too ambitious?
FAQ 131 How do I add form elements together, I have tried many different ways but I always either get NaN or a concenated string (ie 15 + 16 + 1 + 52 = 1615152 != 84)?
FAQ 134 Is it possible to send an email from a JavaScript?
FAQ 150 How do I change text within table cells?
FAQ 210 I keep receiving function undefined in the following script, why?
FAQ 236 How can I show a different image each day?
FAQ 255 How can I combine the previous scripts so that a layer in either Netscape 4 or Explorer 4 is always positioned in the same location on the screen regardless of where in the document the user is currently located?
FAQ 272 When a page is reloaded how can it check that any window it previously opened is not still open before attempting to open it again?
FAQ 276 How do I call two functions from the body tags onLoad event handler?
FAQ 287 How do I display a random banner image?
FAQ 311 How do I disable the "Back" button of a browser?
FAQ 320 Where can I get information about image rollover/mouseovers/highlighting/swapping?
FAQ 325 How can I make a script that will automatically reply an e-mail?
FAQ 438 What's the difference between Java and JavaScript and why should I prevent my browser from executing JavaScript?
FAQ 442 How can I hide the JavaScript source code from "view source" function of the browser?
FAQ 443 Can you use JavaScript to send emails?
FAQ 452 Is there a way to close a window without that confirm message?
FAQ 455 How do you hide the real address of a page?
FAQ 477 Is JavaScript the same as Java?
FAQ 478 What is JavaScript?
FAQ 479 How do I detect the resolution of the visitor's monitor and redirect him to another page?
FAQ 480 How do I pass the value of a text field when the submit button is pressed onto the next page?
FAQ 481 Can I print the current page on both Netscape Navigator and Internet Explorer?
FAQ 482 Is there any way to detect plugins?
FAQ 495 Is JavaScript used only to make web pages better?
FAQ 496 Will learning JavaScript make learning Java any easier?
FAQ 498 Do you know of anyway to retrieve data from a .txt file located on the server?
FAQ 558 How can I avoid people bookmarking pages and returning later without logging onto my site?
FAQ 563 Can JavaScript code situated on the server write to a file on that server?
FAQ 564 Why is JavaScript not a progamming language but a scripting language and what is a scripting language?
FAQ 581 How can I highlight normal text using onMouseover?
FAQ 609 How can I use entities with Microsoft Internet Explorer?
FAQ 629 How can I round a decimal number to a whole number (ie: 1.52=2)?
FAQ 634 How do I get the *.js files to not display their code in Netscape?
FAQ 635 How can I scramble my JavaScript source code so that it is not easily copied?
FAQ 647 When submitting a form, how do I load a thank you page when the user presses the submit button?
FAQ 649 Can you detect if JavaScript is enabled on the users browser?
FAQ 660 How can I swap an image using onMouseOver in an image map?
FAQ 669 How can you change the location of two frames by clicking a text link?
FAQ 945 Is there any way to close the browser window without the confirmation dialog that pops up when using "window.close()"?
FAQ 1542 How can I print a page without the print dialogue box?
FAQ 1551 How do I make a box with a list of hyperlinks appear when the mouse cursor hovers over text, as seen at www.microsoft.com?
FAQ 1572 Where can I find FAQs for server-side javascript?
FAQ 1578 How can I detect, that the user has closed the window (including the use of alt-F4)?
FAQ 1595 How can I disable the "View Source" menu item?
FAQ 1647 How do I force Internet Explorer to print an HTML page as landscape rather than portrait?
FAQ 1685 How do I get the IP address of the visitor?
FAQ 1732 How can I display an absolutely positioned layer of content over form fields so that the form fields do not show through the layer?