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By passing an object reference instead of typing the URL twice we avoid the problems inherent with redundant information. Note that this should not be in quotes. The second argument is a unique name for the popup.

Every popup window must have its own unique name. Different links can target the same popup by all using the same name. When the user clicks on a link, the browser triggers the onClick event, running the code in the onClick attribute. Because the first word is return, the browser watches to see if a true or false value is returned.

The command after return calls the popup function, passing a reference to the link object and a string containing the unique name of the popup. Because onClick returns true the process of connecting to the URL continues as normal in the current window. Most browsers will have window.

Starting in line 7 the script checks if the first argument mylink is a string or an object reference. Either way the script gets a URL to point the popup to.

Next, the script actually opens the popup using the URL and the unique name. Finally, the script returns false. Back in the link, the false value cancels the click event — which is no longer needed because the popup has been opened. The following script is custom designed for opening a popup from a form. The first argument for popupform is always this, meaning the form itself.

Line 1 begins the script element and line 2 begins the popupform function. The first argument, myform , refers to the form itself. The second argument, windowname , sets a unique name for the popup window. Line 3 tests for the window. Line 4 opens the popup.

Line 5 sets the target property of the form to the name of the popup, so when the form opens it targets the popup instead of the current page. Once a popup window has been created, linking from the popup back to the main window i. Fortunately, JavaScript provides an answer in the form of opener. To create links in the popup window that target back to the main window, first put this JavaScript in the of the popup page:.

In the previous example the link in the popup targets the main page, but the popup stays open in the background after the user clicks on the link. The targetopener function takes three parameters. The first is always this, meaning the link itself. The second and third parameters are optional and default to false. The second parameter indicates if the popup should close. The third is if the link should actually send the opener to the linked resource, or if the opener should just get the focus regardless of what its current page is.

If these conditions are true, then the opener window gets the focus, the opener is directed to the referenced URL, and the script returns false. Because the function returns false, the link does not go on to the URL the script has already done that. Note that the link which targets the opener is a little different than the link that opened the popup window to begin with.

By default, the popup window stays open but is in the background. If you want the popup to close after going back to the opener, add a second parameter of true to the targetopener function call:.

If you just want to close the popup without doing anything else, add another true. You should still link to a valid URL in case the user found the page without opening it as a popup. Specifically, the properties of the popup are set in the third argument for open which is a list of properties for the popup. Properties are set somewhat similar to the way HTML attributes are set: the name of the property followed by an equal sign followed by the value.

Properties are separated by commas. Because of a widespread bug in MSIE, do not put any spaces in the list of properties. The entire list of properties goes inside quotes. So, for example, the following line of code sets width to , height to , and turns scrollbars on. All other properties are optional. Width and height are the only required properties for a popup window. This line in our popup script creates a popup that is wide and high:.

The left and top properties set the position of the popup on the screen. For example, this command in the popup script puts the popup left from the left of the screen and top from the top:.

The toolbar property indicates if there should be toolbar in the popup. The toolbar is the bar at the top of the window with buttons for going forward, back, home, and other major navigational tasks. You can put the above code into a function, then call the function, passing the URL as a parameter, whenever you want to open a popup window. The above script creates a function that accepts a parameter called "url".

You can now call the function in your HTML as follows. In the script, we use this. This piece is the "url" parameter that we're passing to the function. The return false bit ensures our base page doesn't actually go to that address - only the popup window. This script is more versatile than the above script. This is because the function accepts parameters for more of the popup's properties ie.

This means you won't need to create a new function every time you want a different sized popup, a popup with a different name, or a popup in a different position.

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Basic JavaScript Popup Script.Popup download window javascript

 

A bad page could open tons of popup windows with ads. So now most browsers try to block popups and protect the user. Most browsers block popups if they are called outside of user-triggered event handlers like onclick. This way users are somewhat protected from unwanted popups, but the functionality is not disabled totally.

There is also a number of less supported browser-specific features, which are usually not used. Check window. Run it and see what really happens. The open call returns a reference to the new window. It can be used to manipulate its properties, change location and even more. Please note: immediately after window. So we wait for onload to modify it. Otherwise, e. For the details, see chapter Cross-window communication. It is null for all windows except popups. So the connection between the windows is bidirectional: the main window and the popup have a reference to each other.

Technically, the close method is available for any window , but window. The closed property is true if the window is closed. Example alert "I am an alert box! Example if confirm "Press a button! How are you today? Report Error. Get Certified.

Your message has been sent to W3Schools. W3Schools is optimized for learning and training. Examples might be simplified to improve reading and learning. The above script creates a function that accepts a parameter called "url". You can now call the function in your HTML as follows.

In the script, we use this. This piece is the "url" parameter that we're passing to the function. The return false bit ensures our base page doesn't actually go to that address - only the popup window.

This script is more versatile than the above script. This is because the function accepts parameters for more of the popup's properties ie. This means you won't need to create a new function every time you want a different sized popup, a popup with a different name, or a popup in a different position. This function centers the popup in the middle of the users' screen.