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Note that this function just loads the page, and not renders the page on the screen. This is not an asynchronous call, so dimensions are returned immediately. The return value is a Promise.
In this tutorial, a canvas element is used. Go to PDF. JS Github Page and download the files. There will be 2 files in the "build" directory. Include them in your HTML. In this tutorial, version 1.
JS has been used. JS files are pretty huge. It is better if you minify them. You can use an online UglifyJS minifier. Remember page rendering is asynchronous, it will take at least a few milliseconds to render a page.
Step 4: It accepts the url of the PDF as parameter.
On successful loading it calls the showPage function that will show the first page of the PDF. While a page is being rendered, Previous and Next buttons are disbaled.
A very important point is to note that we have to change the scale of the rendered page as per the width of the canvas element. In this case the width of the canvas element is less than the actual width of the PDF, so when PDF is rendered in the canvas it has to be scaled down.
To enable text selection, some extra steps need to be followed. JS for more.
Set the field as Date and choose the appropriate option: Name the script as "start", for example, clear the suggested script function The code to be added, supposing there is a field called "currentDate" on the form:. So, a little bit more information would be needed.
Besides the Reference, which you will need at hand in any case, your questions are widely asked by the Guide. With Acrobat Standard not having the ability to edit a document level script, one can add the code to the page open action but might not want the code to run every time the page is opened, this can arise with a multipage form, so I would use a function to update the field and also test to see if it has already been run before updating the field or preforming other initialization tasks.
There are a couple of functions provided that could be reused within the form for repeated tasks.
The code checks to see if the form has been initialized by checking if a specific variable exist or not. If the variable does not exist, it is defined as a document level function or a variable the has the scope of the document.
It is set to an initial state of "false". The Initialize function test the document level variable's value and only executes specific code of the variable is not true or the Initialize function has not been run before.
As part of the function, the variable is set to "true" to indicate that Initialize function has been run at least once.