不显示在Oracle Apex中定义的页面属性 [英] Page Property Defined in Oracle Apex Does Not Display

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本文介绍了不显示在Oracle Apex中定义的页面属性的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

这是对来自另一个讨论的后续追踪，来自另一个 oracle-apex 标签为SO问题，作者无法使用变量 TITLE 值自定义其Apex页面（相当于设置html < TITLE>< / title> 定义块）。

接受的解决方案发布在：更改基于项目的页面标题表明，在相应的字段中使用Apex替换值应该可以实现此目的：



如果为 TITLE 页面属性设置了 任何 值（替换值，静态文字等），什么会导致设置不显示？

解决方案

Oracle Apex页面显示设置和属性疑难解答



一个模拟的场景是定义的页面项放置在Page TITLE 字段中，但值当页面运行时不会显示。


排除更明显开发人员错误，如拼写错误或应用不一致的页面项目名称，可能根本没有任何错误...除了自定义应用程序模板/主题已经排除或意外地将必要的html块从其定义中删除：< TITLE>< / TITLE> 。通过查看 SHARED COMPONENTS 部分中定义的应用程序主题或模板，可以轻松搜索和确认。




考虑自定义开发人员分配的应用程序模板的影响...



将自定义PAGE类型模板应用于页面标题不显示的示例，我们得到一个原始的模板化HTML脚本，它包含所有输入数据值的占位符，它们是输出显示的一部分： 

  <！DOCTYPE html PUBLIC -  // W3C // DTD HTML 4.01 Transitional // EN> 
< head> 
＃HEAD＃
< title>＃TITLE＃< / title> 
< / head> 
< body＃ONLOAD＃>＃FORM_OPEN＃< a name =PAGETOP>< / a>

请注意以下行： < title>＃TITLE＃< ; / title>> ，没有它，如果使用这个模板，将不会有页面标题。为了验证，模板脚本/ html被重写并且该行被删除。结果：

修改页面模板



将修改后的页面模板关联到Apex Page





设置页面项目的值与页面标题相关





尝试为与页面标题相关联的页面项目设置备用值。

无论对关联的页面项设置了什么值，TITLE的页面属性都不会填充（请参阅与演示页面关联的标签标题）。





在寻找应用程序设计中已定义的缺失属性时，可以首先查看页面模板和输出渲染过程。

使用替代页面设置HTML TITLE 页面属性



如果问题不在自定义模板，或者如果选择的模板是默认模板或Oracle标准模板，还有其他注意事项：

这是破损Apex页面的设计布局，其中HTML TITLE属性由存在于同一页面上的页面级项目定义：


  1. 页面的显示属性设置为替代引用在同一页面上定义的页面级项目的值：& P12_PAGE_TITLE。。

  2. 对于此示例， code> P12_

如果页面项目 SOURCE 值显式设置为title，这不起作用。我通过使用在另一页上设置的计算操作来设置项目 P12_PAGE_TITLE ，从而找到了一个可行的解决方案。 / p>

这是testing外部页面的布局，它在前设置 P12_PAGE_TITLE 项目值 em>目标页面被重定向，并呈现TITLE html属性。




  1. 设置自由格式条目的文本框： P14_PICK_PAGE_TITLE

  2. 制作表单按钮： P14_SUBMIT_TITLE_CHOICE ，其中 SUBMIT 动作。

  3. A COMPUTATION 设计 AFTER SUBMIT 传输在测试页上输入的值（P14），并在目标页面P12上设置该值。 action被定义为运行 AFTER PROCESSING （以及 AFTER COMPUTATIONS 和 AFTER SUBMIT ）

  4. BRANCH

这是结果：

< >



在替代页面上设计的用于收集指定页面标题的表单。 b



这是基于存储在在最终目标页面的TITLE SELECTION区域中显示的只显示页面项目。



其他讨论： COMPUTATION 字段可以帮助确保在其他页面呈现活动之前为页面级别的项目分配其值。否则，只有在大部分页面被渲染后才会读取源或分配的数据值。


当 >分配/设置页面项目值与放入其中的数据值一样重要。



This is a follow-up to a discussion originating from another tagged SO question where the author could not customize their Apex page with a variable TITLE value (the equivalent to setting the html <TITLE></TITLE> definition block).

The accepted solution posted under: Changing Page Title Based on an Item suggests that using an "Apex substitution value" in the appropriate field should accomplish this:

If any value is set for the TITLE page property (substitution values, static literals, etc.), what can cause the setting not to display?

解决方案

Troubleshooting Oracle Apex Page Display Settings and Attributes

A mocked up scenario would be where a defined page item is placed in the Page TITLE field, but the value does not show up when the page is "run".

Excluding more obvious developer errors such as misspelled or inconsistently applied page item names, it is possible that there is nothing wrong at all... except that a custom application template/theme has excluded or accidentally left out the necessary html block from its definition: <TITLE></TITLE>. This is easily searchable and confirmed by viewing the Application Theme or Template defined under the SHARED COMPONENTS section.

Considering the Effect of Custom Developer Assigned Application Templates...

Applying a custom PAGE typed template to an example where the page title does not display, we get an original templated html script, complete with placeholders for all the input data values that are a part of the output display:

    <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
    <head>
        #HEAD#
        <title>#TITLE#</title>
    </head>
    <body #ONLOAD#>#FORM_OPEN#<a name="PAGETOP"></a>

Note the line: <title>#TITLE#</title>, without it, there would be no page title if this template were used. To verify, the template script/html is rewritten and the line is deleted. The result:

Modifying a Page Template

Associating the Modified Page Template to the Apex Page

Setting the Value for the Page Item Associated with the page title.

Trying to Set an alternate Value for the Page Item Associated with the page title.

No matter what value is set to the associated page item, the page attribute of "TITLE" does not populate (see the title of the tab associated with the demo pages).

Page templates and output rendering processes are possible places to look first when troubleshooting a missing attribute already defined within the application design.

Using an Alternate Page to Set the HTML TITLE Page Property

If the problem is not with a custom template or if the template selected is a default or Oracle "standard" template, there are other considerations:

This is the design layout of a "broken" Apex page where the html TITLE property is defined by a page level item that exists on the same page:

  1. The Display Attribute of the Page is set with a substitution value referencing a page level item defined on the same page: &P12_PAGE_TITLE..
  2. For this example, the page level item P12_PAGE_TITLE is defined as a Display Only type.

If the page item SOURCE value is set to the "title" explicitly, this does not work. I figured out a working solution by setting the item, P12_PAGE_TITLE by using a COMPUTATION operation set up on another page.

This is the layout of the "testing" external page that sets the P12_PAGE_TITLE item value before the target page is redirected and the TITLE html property is rendered.

  1. Set up a text box for free-form entry: P14_PICK_PAGE_TITLE
  2. Make a form Button: P14_SUBMIT_TITLE_CHOICE with a SUBMIT action.
  3. A COMPUTATION designed AFTER SUBMIT transfers the value entered on the test page (P14) and sets the value on the target page, P12.
  4. A BRANCH action is defined to run AFTER PROCESSING (as well as AFTER COMPUTATIONS and AFTER SUBMIT)
  5. The BRANCH action is set to trigger when the button defined in step (2) is selected.

This is the result:

The form designed on an alternate page for collecting the designated page title.

This is the target page based on the selected title stored in the display-only page item displayed in the TITLE SELECTION region of the final target page.

Additional Discussion: COMPUTATION fields can assist with ensuring that page level items are assigned their value in advance of other page rendering activities. Otherwise, the source or assigned data value is not read until after most of the page has been rendered.

When a page item value is assigned/set is just as important as the data value put into it.

这篇关于不显示在Oracle Apex中定义的页面属性的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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