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Customize Edit UI/UX

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2sxc Custom Color-Picker Input Field

2sxc 11 makes it very easy to create custom input fields using standard WebComponents. This example shows a color picker using Pickr, a cool JS library.

You can learn how to:

  • Use connector.loadScript(...) to load a js library
  • Use connector.data to get the value and update it
  • How to only update the data if you really change it (so users can cancel the dialog without being asked)
  • How to save null to explicitly not save or reset a value
  • Use disconnectedCallback() to destroy inner objects

Important: The feature "Public Use of Edit Form" is disabled

The feature is needed for anonymous users to use the Edit Form. Register your site here https://patrons.2sxc.org/ to get access to the feature.

New syntax: String Color-Picker Custom Input Field

This example shows a real string-field uses Pickr to provide a color picker.
Hit this edit button to have a look:


      @Kit.Toolbar.Empty().New("UiStringColorPickr").AsTag()
      

    Old syntax: String Color-Picker Custom Input Field

    This example shows a real string-field uses Pickr to provide a color picker.
    Hit this edit button to have a look:


        @Edit.Toolbar(toolbar: new [] { "toolbar=empty", "+new?contentType=UiStringColorPickr" })
        
      Important: We opened permissions that you can experience the edit dialog - so you can save, but it will just create draft data 😉.

      Source of [App]/system/field-string-app-color-pickr/index.js

      Below you'll see the source code of the file. Note that we're just showing the main part, and hiding some parts of the file which are not relevant for understanding the essentials. Click to expand the code

      /*
        This examples shows a plain JS WebComponent which has has a Pickr color-picker
        Uses the neat Pickr from https://simonwep.github.io/pickr/
        This simple picker has a predefined set of colors and doesn't allow field configuration
      */
      
      // always use an IFFE to ensure you don't put variables in the window scope
      (() => {
      
        const tagName = 'field-string-app-color-pickr';
        const pickrJsCdn = 'https://cdn.jsdelivr.net/npm/@simonwep/pickr/dist/pickr.min.js';
        const html = `
        <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/@simonwep/pickr/dist/themes/classic.min.css"/>
        <div class="pickr-container"></div>`;
      
        class StringColorPicker extends HTMLElement {
      
          /** connectedCallback() is the standard callback when the component has been attached */
          connectedCallback() {
            this.innerHTML = html;
            // if the window.Pickr doesn't exist yet, load the JS from the CDN () and then do a callback
            this.connector.loadScript('Pickr', pickrJsCdn, () => { this.initPick() });
          }
      
          /** disconnectedCallback() is a standard callback for clean-up */
          disconnectedCallback() {
            if (this.pickr) this.pickr.destroyAndRemove();
          }
      
          /** This is called when the JS is loaded from loadScript - so Pickr is ready */
          initPick() {
            this.pickr = new Pickr({
              el: '.pickr-container',
              theme: 'classic',
              default: this.connector.data.value || null,
              defaultRepresentation: 'HEXA',
              swatches: this.getSwatches(),
              components: {
                // Main components
                preview: true,
                opacity: true,
                hue: true,
      
                // Input / output Options
                interaction: {
                  hex: true,
                  rgba: true,
                  hsla: true,
                  hsva: true,
                  cmyk: true,
                  input: true,
                  cancel: true,
                  clear: true,
                  save: true,
                },
              },
            });
            
            // remember if we're working empty as of now
            this.cleared = !this.connector.data.value;
      
            // bind events for changes etc. to live-update the preview
            this.pickr.on('change', (color, instance) => this.applyColor(instance));
            this.pickr.on('changestop', (instance) => this.applyColor(instance));
            this.pickr.on('swatchselect', (color, instance) => this.applyColor(instance));
      
            this.pickr.on('save', (color,instance) => instance.hide());
            this.pickr.on('hide', (instance) => this.update(instance));
            this.pickr.on('clear', (instance) => {
              this.cleared = true;
              this.update();
            });
          }
      
          /** Update the preview */
          applyColor(instance) {
            this.cleared = false;
            instance.applyColor(true);
          }
      
          /** Update the value */
          update(instance) {
            // if it's still cleared, just save null
            if (this.cleared) {
              return this.updateIfChanged(null);
            }
            // otherwise get the current color
            var color = instance.getColor();
            if (color) color = color.toHEXA().toString();
            this.updateIfChanged(color);
          }
      
          /** Only update the value if it really changed, so form isn't dirty if nothing was set */
          updateIfChanged(value) {
            var data = this.connector.data;
            if (data.value === '' && value == null) return;
            if (data.value === value) return;
            data.update(value);
          }
          
      
          /** Create the default color recommendations for the color picker */
          getSwatches() {
            return [
              'rgba(244, 67, 54, 1)',
              'rgba(233, 30, 99, 0.95)',
              'rgba(156, 39, 176, 0.9)',
              'rgba(103, 58, 183, 0.85)',
              'rgba(63, 81, 181, 0.8)',
              'rgba(33, 150, 243, 0.75)',
              'rgba(3, 169, 244, 0.7)',
              'rgba(0, 188, 212, 0.7)',
              'rgba(0, 150, 136, 0.75)',
              'rgba(76, 175, 80, 0.8)',
              'rgba(139, 195, 74, 0.85)',
              'rgba(205, 220, 57, 0.9)',
              'rgba(255, 235, 59, 0.95)',
              'rgba(255, 193, 7, 1)',
            ]
          }
        }
      
        // Register this web component - if it hasn't been registered yet
        if (!customElements.get(tagName)) customElements.define(tagName, StringColorPicker);
      })();