How to allow users to customize text field with styling

问题

I am currently working on a project for school and am required to create a blog. Part of our assignment is to create an input field that would allow users to customize the styling of their text within the field. Although I have looked around, I have had no luck in finding what it is that I am looking for. For clarification, the goal is to create a field that resembles the field on here when creating a post (Photo included below).

I am assuming that Javascript and/or JQuery is required, although I am unsure where to begin. Features would include text styling, addition of links, keeping track of [return]s (to create new paragraphs) and any other HTML/CSS elements.

Below, I will include examples of what it is exactly that I am wanting in case I am in any way unclear.

Thank you in advance for any help/guidance!

Example 1:

Example 2:

回答1:

You could create it yourself!

I threw this together in a couple of minutes. It's pretty rudimentary, but if you want to build it yourself, this could be a starting point for you:

var areas = document.getElementsByClassName('augmented-textarea');

var commands = [{
  display: "<b>B</b>",
  f: function(text) {
    return "**" + text + "**";
  },
}, {
  display: "<i>I</i>",
  f: function(text) {
    return "_" + text + "_";
  },
}, ];

Array.prototype.forEach.call(areas, initTextarea);

function initTextarea(t) {
  var wrapper = document.createElement('div');
  wrapper.classList.add('textarea-wrapper');
  var bar = document.createElement('div');
  bar.classList.add('textarea-bar');

  commands.forEach(function(c) {
    var b = document.createElement('button');
    b.type = 'button';
    b.innerHTML = c.display;
    b.addEventListener('click', function() {
      if (t.selectionStart === t.selectionEnd)
        return;

      var v = t.value,
        ss = t.selectionStart,
        se = t.selectionEnd,
        prefix = v.slice(0, ss),
        suffix = v.slice(se),
        target = v.substring(ss, se),
        changed = c.f(target);
      t.value = prefix + changed + suffix;
      t.selectionStart = ss;
      t.selectionEnd = ss + changed.length;
      t.focus();
    });
    bar.appendChild(b);
  });

  t.parentNode.insertBefore(wrapper, t);
  t.parentNode.removeChild(t);
  wrapper.appendChild(bar);
  wrapper.appendChild(t);
}

.textarea-wrapper {
  display: flex;
  overflow: hidden;
  width: 300px;
  flex-direction: column;
  border: 1px solid gray;
}
.textarea-bar {
  background-color: #ddd;
  min-height: 30px;
  line-height: 30px;
}
.textarea-bar button {
  background-color: #ddd;
  font-family: serif;
  font-size: 20px;
  width: 30px;
  display: inline-block;
  border: 1px solid gray;
  border-radius: 3px;
  margin: 3px;
  cursor: pointer;
}
.augmented-textarea {
  width: 100%;
  max-width: 100%;
  height: 70px;
  box-sizing: border-box;
  border: 0;
}

<textarea class="augmented-textarea">Select some text and press one of the buttons above!</textarea>

Each command is registered in the commands array, with HTML for a button, and an instruction to do with the selected text.

回答2:

Use a text editor for this. There are lot of text editor plugins are available.

This may help you : http://ckeditor.com/

Note: Have a look in to the Licence also before using the editor.

回答3:

Just use tinymce - unless your assignment is to create the actual control itself, which is far more complicated than even creating a blog unfortunately.

Get TinyMCE here: https://github.com/tinymce

or at their site: https://www.tinymce.com/

Then create a textarea element and initiate the control:

Include TinyMCE at the bottom of your page and include this script below that include.

Example here @ the TinyMCE site: https://www.tinymce.com/docs/demo/basic-example/#liveexample

HTML:

<textarea></textarea>

Javascript:

tinymce.init({
  selector: 'textarea',
  height: 500,
  plugins: [
    'advlist autolink lists link image charmap print preview anchor',
    'searchreplace visualblocks code fullscreen',
    'insertdatetime media table contextmenu paste code'
  ],
  toolbar: 'insertfile undo redo | styleselect | bold italic | alignleft aligncenter alignright alignjustify | bullist numlist outdent indent | link image',
  content_css: [
    '//fast.fonts.net/cssapi/e6dc9b99-64fe-4292-ad98-6974f93cd2a2.css',
    '//www.tinymce.com/css/codepen.min.css'
  ]
});

来源：https://stackoverflow.com/questions/35953345/how-to-allow-users-to-customize-text-field-with-styling