Question

I have a textarea that starts with text I don t want the user to be able to change and are prevented in doing so by the following:

The left key and backspace work until it reaches the position of the undeletable text.
The up key has a special function and doesn t serve navigational purposes (returns false).
- (With the previous two rules, the user cannot place the caret in this region via arrow keys)
When the user clicks the element, the caret is placed at the end of the textarea (on mouse down).
Home and ctrl+a have been handled too.

为了说明问题,它想看像什么。

Don t Delete Anything Before the Colon:  Your text here.  The user text will also
wrap like this.

我知道,我的情况只是一个:Drag和下降。我知道,如何完全减少和减少,但这是我想要的。我不想让不可磨灭的文本能够改变。 Can 在允许退学之前,我将给予照顾。或者,我能否阻止退学,但能否进入退学事件,把它放在我喜欢的地方?

Answer 1

I figured it out, here s the gist:

为了避免混淆,我首先“hi”了OnDragOver和OnDragEnter。

function(event){
  event.preventDefault ? event.preventDefault() : event.returnValue = false;
}

然后,我阻止了OnDrop,但把数据放在我想要的地方。

function(event){
  element.value += event.dataTransfer.getData("Text");
  event.preventDefault ? event.preventDefault() : event.returnValue = false;
}

Answer 2

我制定了解决办法。它取决于 j,但熟练的JA方案管理员可以轻易消除这种依赖性Imure。

Live Demo:http://trafnar.github.com/permastring/

JS Code:

Github Repo: https://github.com/trafnar/permastring

它通过不断储存案文领域的价值而开展工作,从根本上消除任何改变永久特征的变化。

我迄今为止注意到的最大缺陷是,它破坏了用户选择所有+删除的能力。 Edit:我确定这一缺点,现在可以选择所有东西,删除。

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