Partial Page Rendering Using Hidden Iframe
Partial Page Rendering Using Hidden IFrame
Executive Summary:
Partial-page rendering removes the absence for the whole web page to be refreshed as the result of a postback. Instead, only individual zones of the page that have changed are updated. As a result, users do no see the whole page reload with every postback, which makes user interaction with the Web page more seamless.
Developers that ambition to add such behaviors to their web pages are constantly faced with a complicated determination. All of these actions can be implemented using a very simple solution: by refreshing the whole page in response to the user interaction. However this solution is cozy but not always pleasing. The full page refresh can be slow, giving the user the impression that the application is unresponsive. Another option is to appliance such actions using JavaScript (or other client-side scripting technologies). This results in faster response periods, at the disbursement of more intricate, fewer portable code. JavaScript may be a good choice for simple actions,
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This paper provides a solution which avoids the drawbacks of the full page activate and custom JavaScript solutions. In this paper partial page performance functionality provides the competence to re-render a restricted portion of a page. As in the full page render solution, prejudiced page rendering sends a request behind to the applying above the middle-tier to fetch the current contents. However, when prejudiced page rendering is would do,0 update the page, only the modified contents are brought back to the browser. This paper gives the solution using a hidden IFrame and easy JavaScript to incorporate the current contents back into the web page. The end outcome is that the page is updated without custom JavaScript code,
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Introduction:
Web pages typically assist a kind of actions, for example,0 entering and submitting form data and navigating to different pages. Many web pages also patronize another type of action, which is to grant the user to make modifications to the contents of the web page itself without really navigating to a different page. Some examples of such actions contain,0.
Clicking on a link could update an picture on the same page. For example, an automobile configuration application might update an image of a car as the user chooses different options, for example,0 the favored color.
Selecting an item from a choice box might result in modifications to additional fields on the same page. For example, selecting a automobile make might update the set of accessible car models that are displayed.
Clicking a correlate alternatively selecting one item from a alternative could be would do,0 scroll to a new page of data in a table. Clicking a clasp in a table might increase a new row to the table.
All of these actions are similar in that they result in the same page being re-rendered in a slightly different state. Ideally,
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Partial page rendering can be implemented with quite simple solution using a hidden IFrame and minimal JavaScript. Any portion of the page can be partially rendered with using a div or table tags in HTML.
Page Elements That May Change During PPR:
?Re-Render Data: The same fields are redrawn but their data is updated. Examples include the Refresh Data action button, or recalculate absolutes in a table.
?Re-render Dependent Fields: Fields may be added, removed, or change sequence, and data may be updated. Examples include the Country choice account, which may exhibit different residence fields, and toggling among Simple and Advanced Search.
?Hide/Show Content: Both fields and data toggle in and out of sight,0.
Page Elements That Do Not Change During PPR:
Some page elements are always related with a page, regardless of the content displayed on the page.
As a general rule of thumb, elements above the page title (besides information boxes) stay,0 constant and do not change location, though elements in footer constant but may push up or down the page to adjust changes to page content. The following elements not change when PPR is initiated:
?Branding
?Global buttons
?Tabs, Horizontal Navigation, SubTabs
?Locator elements: Breadcrumbs, Train, Next/Back Locator
?Quick links
?Page titles ({first|at {first|at at first,0,0},0} class header)
?Page footer
?Separator lines between the Tabs and Page Title
In most cases the following elements will also not change, other than moving up or down the page to accommodate changed elements. Nevertheless, in definite cases actions on the page may necessitate them to be redrawn:
?Side Navigation, unless it contains a Hide/Show control.
?Subtabs
?Contextual information
?Page-level action/navigation buttons
?Page-level Instruction text
?Page-level Page stamps
?Page-level Key Notation
In whole,0 upon scenarios this solution be able to,0 be used to fulfill the agreeable rendition and user interaction of the web pages.
Contexts in Which PPR Should Not Be Used:
When PPR is implemented correctly, it significantly improves application performance. When performance correction is not possible with PPR, it ought not be implemented, thus shirking unnecessary code bloat, PPR can��t be used when navigating to another page (with a different caption).
Partial Page Rendering Solution:
Solution provided to the Partial Page Rendering using simple hidden iframe and JavaScript, this can be used as a generalized solution to all the Partial Page Rendering scenarios.
Below is the main html (Table 1.1), which ambition have 2 buttons one is to show a simple table which ambition be generated by the server, and another button to remove the table.
HTML Code:
[head]
[title] Main Document [/title]
[script language="JavaScript"]
[!--
function showTable()
hiframe.location="./table.htm";
function removeTable() {
document.getElementById("tableId").innerHTML="";
}
//--]
[/script]
[/head]
[body]
[iframe id="hiframe" style="visibility:hidden;display:none"][/iframe]
[table]
[tr]
[td]Table::[/td]
[td][/td]
[/tr]
[tr]
[td colspan="2"][div id="tableId"][/div][/td]
[/tr]
[tr]
[td][input type="button" value="Show Table" onclick="showTable()"][/td]
[td][input type="button" value="Remove Table" onclick="removeTable()"][/td]
[/tr]
[/table]
[/body]
Table 1.1
[iframe id="hiframe" style="visibility:hidden;display:none"][/iframe]
This iframe tag is used as target to the Partial Page Rendering Request.
The label [input type="button" value="Show Table" onclick="showTable()"] gives the user action to get the contents of a table from the server, in this solution example html is provided to render the table, which conceived to be generated at the server.
The tag [input type="button" value="Remove Table" onclick="removeTable()"] gives the user to clear the table from the user interface.
The JavaScript
function showTable()
hiframe.location="./table.htm";
Is accustom to acquire,0 the contents from the server, the line hiframe.location="./table.htm"; sends the GET request to the server, and like,0 a feedback iframe gets the HTML.
If the prerequisite insists to send a POST request for Partial Page rendering Response, that can be achieved by setting the html form element target attribute as the appoint of hidden iframe.
The code for the post apply looks like
[form method=��post�� action=��/myaction�� target=��hiframe��]
Partial Page Rendering Server Response:
Table 1.2 shows the sample response from the server for Partial Page Rendering. This response has the JavaScript code to transfer the HTML from hidden iframe to main page.
HTML Code:
[head]
[script language="JavaScript"]
[!--
function iframeLoad()
parent.document.getElementById("tableId").innerHTML = document.getElementById("tableId").innerHTML;
//--]
[/script]
[/head]
[body onload="iframeLoad()"]
[div id="tableId"]
[table]
[tr]
[td]1[/td]
[td]One[/td]
[/tr]
[tr]
[td]2[/td]
[td]Two[/td]
[/tr]
[/table]
[/div]
[/body]
Table 1.2
The tag [div id="tableId"] encloses the content to transmit from hidden iframe to main page.
[table]
[tr]
[td]1[/td]
[td]One[/td]
[/tr]
[tr]
[td]2[/td]
[td]Two[/td]
[/tr]
[/table]
This is the content apt show the chart apt user.
The code [body onload="iframeLoad()"] is used for triggering the action to transfer the content.
function iframeLoad()
parent.document.getElementById("tableId").innerHTM L = document.getElementById("tableId").innerHTML;
This JavaScript function does the transferring data from the secluded iframe to cardinal sheet.
parent.document.getElementById("tableId").innerHTM L This part refers to tag div html id in main page and this part document.getElementById("tableId").innerHTML refers the HTML of the Partial Page Response.
Conclusion:
Improve the user experience with Web pages that are richer, that are more responsive to user actions, and that conduct like traditional customer applications. Reduce full-page refreshes and avoid page flicker. Partial page rendering using iframe is a very simple solution.
References:
1.http://ajax.asp.net/docs/overview/PartialPageRenderingOverview.aspx
2.http://www.w3schools.com/htmldom/dom_obj_document.asp
3.http://www.w3schools.com/tags/tag_iframe.asp
4.http://www.oracle.com/technology/tech/blaf/specs/ppr.html
5.http://download-west.oracle.com/otn_hosted_doc/jdeveloper/904preview/uixhelp/uixdevguide/partialpage.html
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