New Frequently Asked Questions

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FAQ 1700 How can I create a single frame frameset?
FAQ 1701 How can I get the value of a text input field without using the name of the field?
FAQ 1702 How can I use an external JavaScript source file to amend all the mailto links in a document such that it appends a generic subject line?
FAQ 1703 How can I clear the contents of one frame from another?
FAQ 1704 How can I performance test JavaScript?
FAQ 1705 Can I submit a form in a parent window by clicking a submit button in a child window?
FAQ 1706 How can I randomly open one of 100 windows named 1.htm to 100.htm?
FAQ 1707 How can I completely hide a frame in all browsers?
FAQ 1708 How can I pass the value of a hidden field into a confirm dialog box when the submit button is pressed, so I can ask the user if they really want to edit/remove the visible version of the hidden value?
FAQ 1709 How can I use the main windows scrollbars to scroll the contents of an inline frame?
FAQ 1710 How do I ensure that a form field contains a .gov domain (whether that be .gov, .gov.uk etc)?
FAQ 1711 How can set the focus in a form field in a absolutelty positioned layer?
FAQ 1712 How can I disable a group of radio buttons?
FAQ 1713 How can I send the submission of an from to an email address or a URL depending of the status of a checkbox?
FAQ 1714 How can I resize the opener of a popup window?
FAQ 1715 How can I concatenate two values from two select lists to the URL associated with a clicked image map?
FAQ 1716 How can I detect when the opener of a popup window has changed?
FAQ 1717 How do I check that text entered in a text form field is an integer?
FAQ 1718 How can I reject a form submission if one of any number of validate functions returns false?
FAQ 1719 How can I populate a list of text form fields from the selected options in a multiple select list?
FAQ 1720 How can I copy the contents pf a text input form field when the user changes its value to a hidden form field in a different form on the same page?
FAQ 1721 How can I round up a number to the nearest 0.5?
FAQ 1722 How can I force an unclicked link to look as though it had been clicked?
FAQ 1723 How can I redirect to another page depending on how many checkboxes have been checked?
FAQ 1724 How can I dynamically display text underneath an image using an image map and on mouse over events?
FAQ 1725 How do I avoid the main window displaying [object] when I click on a hypertext link to open a new popup window?
FAQ 1726 How can I count of number of instances of a particular word or character in a string?
FAQ 1727 How can I hint to the user that I want a password enter into a text field, and then when the user enters text into the field it turns into a password field?
FAQ 1728 How can I show the dates for the last two weeks in a select form field?
FAQ 1729 How can I uncheck all radio boxes within a group of radio boxes?
FAQ 1730 How can I remove options from a select list based either on the text property value or the value property value?
FAQ 1731 Is there a way of shifting the contents of an array down / up e.g. 1 becomes 2, 2 becomes 3 etc?
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?
FAQ 1733 How do you dynamically write a form field to a layer so Netscape displays it?
FAQ 1734 How can I display something on the page if JavaScript is disabled without first testing from another page?
FAQ 1735 How can an imagemap capture the focus when the mouse moves over a hotspot?
FAQ 1736 Why does document.myForm.submit() not work or return an error?
FAQ 1737 On Netscape 4.0 & 4.6 for the Mac resizing the window will break all of your hyperlinks' onClick actions
FAQ 1738 How can a function in one *.js file call another function in a second *.js file?
FAQ 1739 How can I make the page longer, or the vertical scroll bar appear when I dynamically populate a layer with lots of content in Netscape Navigator 4?
FAQ 1740 How can I filter user input to leave just the numerical digits?
FAQ 1741 Is it possible to put a scrollbar to a select drop down list?
FAQ 1742 Can you simulate a click on an <input type="file"> button?
FAQ 1743 When placing the value of a JavaScript variable into a URL request, how do I correctly format the variable value, so that spaces etc are converted into the standard html request syntax?
FAQ 1744 How can cross-hairs follow the mouse pointer over an image or set of images?
FAQ 1745 How can an image slide across the top of images when the mouse pointer moves across the same images?
FAQ 1746 Is it possible to secure web pages using JavaScript?
FAQ 1747 How can I change the HREF attribute of a link when a form button is clicked?
FAQ 1748 Netscape Navigator 4 loses the onMouseDown event handlers after a window resize
FAQ 1749 How can I assign five substrings of a larger string to the variables named str1, str2... to str5?
FAQ 1750 How do I test the equality of two strings?
FAQ 1751 Why do animated GIFs stop animating when I click on a link, and how can I avoid this?
FAQ 1752 Can JavaScript use newline characters to format the output?
FAQ 1753 How do you determine if a variable exists?
FAQ 1754 How can I execute a function every 10 seconds?
FAQ 1755 How can I stop my HTML code from being viewed?
FAQ 1756 How can I send email from a form that works also with Outlook/Outlook Express?
FAQ 1757 How can I define my own mouse cursor for the Internet Explorer using my own *.ico file?
FAQ 1758 How do I know which frame has the focus?
FAQ 1759 How can I create an option in a select statement with a particular style?
FAQ 1760 How can you format numbers as right-aligned in a text field?
FAQ 1761 How can I close the current popup window's opener?
FAQ 1762 How do I password protect a directory or file using .htaccess in a form and encrypt the password in the address bar?
FAQ 1763 How can I reduce the spacing between paragraphs?
FAQ 1764 How do you hide your Web server's identity from potential hackers?
FAQ 1765 How do you check if a date is valid?
FAQ 1766 How do I avoid the "close window" message?
FAQ 1767 How do you check to see if a string is contained within a list of strings?
FAQ 1768 How can I accesss the CGI variable REMOTE_USER from JavaScript?
FAQ 1769 How to avoid the confirmation dialog box when closing a window in Internet Explorer?
FAQ 1770 How can I disable the back button and prevent other users/hackers from viewing the private pages of the (site/contents) of a user who has logged out?
FAQ 1771 How can you force the current window to close after opening a popup window?
FAQ 1772 How can I store a file on the client side and read it from my page?
FAQ 1773 Given a start date and a number of days can you calculate the end date?
FAQ 1774 How can I Enhance IIS?
FAQ 1775 On a form with multiple Submit buttons and input fields, how to you choose which one is pressed when the Enter key is hit?
FAQ 1776 Is it possible to make a pop-up window automatically resize to fit all the text and images contained in a page?
FAQ 1777 Is there a way to have a window self focus but still allow the user to enter data into a form?
FAQ 1778 Re: How do I check if an image file exists?
FAQ 1779 Can I pass JavaScript variables to a CGI Perl program?
FAQ 1780 How can I highlight normal text using onMouseover?
FAQ 1781 How to make a collapsible treeview applet with JavaScript?
FAQ 1782 Q475 Is it possible to pop-up a window the same size as the image it contains?
FAQ 1783 Are Pop-Up Windows Legally and Morally Proper?
FAQ 1784 Can I create a link without having a hand pointer?
FAQ 1785 How do I prevent a form from being submitted when I press the ENTER key?
FAQ 1786 If I use a button to create a pop-up screen with links, how do I get the links to open in the orginal main window, creating frames and make the pop-up disappear?
FAQ 1787 How can I specify the width of a form select field?
FAQ 1788 How do I really force a real reload of the parent window when closing a child without having to mess with annoying frames?
FAQ 1789 Is there a way I can de-activate a submit button after it's been hit by the user, so that in the same session, the user can't use the button again?
FAQ 1790 Why does the server not receive all input from select-option inputs?
FAQ 1791 How can I detect the browser close event?
FAQ 1792 How do you center a layer in IE?
FAQ 1793 How do I make an explanation appear when my mouse pointer hovers over a word?
FAQ 1794 How to detect the type of connection (modem/cable/router) of a web browser?
FAQ 1795 How can I allow the user to combine one option from radio buttons and one option from list and then press submit button to open respective selected webpage??
FAQ 1796 How do I stop a form from being submitted more than once
FAQ 1797 How do I add another statement to an onSubmit validation when it already has one?
FAQ 1798 How can I automatically format a date like 1/5/01 while it is being typed in by the user?
FAQ 1799 do you have any neat tricks to capture the current page's source?
FAQ 1800 How do you control the mouse pointer?
FAQ 1801 How can I resize an image
FAQ 1802 How to make sure a user enters percentage correctly like 88.66 and not 8888 or 888.6..?
FAQ 1803 Why won't the form submit() method work?
FAQ 1804 How do I always popup a window in the center of the parent window regardless of where the parent window is?
FAQ 1805 How can I take "wrapped" text from a form's input field, and at some event of my chosing, double-space it?
FAQ 1806 How would I determine if the visitor's platform is either a Mac or a Windows machine and send them to the appropriate directory on my server?
FAQ 1807 How do I get a child window to close after clicking on a link that opens in the parent window?
FAQ 1808 Can I use a scrollbar to change a variable?
FAQ 1809 How do I make a modal window?
FAQ 1810 How can I disable the back button?