paper-input-container.html 18.2 KB
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609
<!--
@license
Copyright (c) 2015 The Polymer Project Authors. All rights reserved.
This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
Code distributed by Google as part of the polymer project is also
subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
-->

<link rel="import" href="../polymer/polymer.html">
<link rel="import" href="../paper-styles/paper-styles.html">

<!--
`<paper-input-container>` is a container for a `<label>`, an `<input is="iron-input">` or
`<iron-autogrow-textarea>` and optional add-on elements such as an error message or character
counter, used to implement Material Design text fields.

For example:

    <paper-input-container>
      <label>Your name</label>
      <input is="iron-input">
    </paper-input-container>

### Listening for input changes

By default, it listens for changes on the `bind-value` attribute on its children nodes and perform
tasks such as auto-validating and label styling when the `bind-value` changes. You can configure
the attribute it listens to with the `attr-for-value` attribute.

### Using a custom input element

You can use a custom input element in a `<paper-input-container>`, for example to implement a
compound input field like a social security number input. The custom input element should have the
`paper-input-input` class, have a `notify:true` value property and optionally implements
`Polymer.IronValidatableBehavior` if it is validatable.

    <paper-input-container attr-for-value="ssn-value">
      <label>Social security number</label>
      <ssn-input class="paper-input-input"></ssn-input>
    </paper-input-container>

### Validation

If the `auto-validate` attribute is set, the input container will validate the input and update
the container styling when the input value changes.

### Add-ons

Add-ons are child elements of a `<paper-input-container>` with the `add-on` attribute and
implements the `Polymer.PaperInputAddonBehavior` behavior. They are notified when the input value
or validity changes, and may implement functionality such as error messages or character counters.
They appear at the bottom of the input.

### Prefixes and suffixes
These are child elements of a `<paper-input-container>` with the `prefix`
or `suffix` attribute, and are displayed inline with the input, before or after.

    <paper-input-container>
      <div prefix>$</div>
      <label>Total</label>
      <input is="iron-input">
      <paper-icon-button suffix icon="clear"></paper-icon-button>
    </paper-input-container>

### Styling

The following custom properties and mixins are available for styling:

Custom property | Description | Default
----------------|-------------|----------
`--paper-input-container-color` | Label and underline color when the input is not focused | `--secondary-text-color`
`--paper-input-container-focus-color` | Label and underline color when the input is focused | `--default-primary-color`
`--paper-input-container-invalid-color` | Label and underline color when the input is is invalid | `--google-red-500`
`--paper-input-container-input-color` | Input foreground color | `--primary-text-color`
`--paper-input-container` | Mixin applied to the container | `{}`
`--paper-input-container-disabled` | Mixin applied to the container when it's disabled | `{}`
`--paper-input-container-label` | Mixin applied to the label | `{}`
`--paper-input-container-label-focus` | Mixin applied to the label when the input is focused | `{}`
`--paper-input-container-input` | Mixin applied to the input | `{}`
`--paper-input-container-underline` | Mixin applied to the underline | `{}`
`--paper-input-container-underline-focus` | Mixin applied to the underline when the input is focued | `{}`
`--paper-input-container-underline-disabled` | Mixin applied to the underline when the input is disabled | `{}`
`--paper-input-prefix` | Mixin applied to the input prefix | `{}`
`--paper-input-suffix` | Mixin applied to the input suffix | `{}`

This element is `display:block` by default, but you can set the `inline` attribute to make it
`display:inline-block`.
-->
<dom-module id="paper-input-container">
  <template>

    <style>
      :host {
        display: block;
        padding: 8px 0;

        @apply(--paper-input-container);
      }

      :host[inline] {
        display: inline-block;
      }

      :host([disabled]) {
        pointer-events: none;
        opacity: 0.33;

        @apply(--paper-input-container-disabled);
      }

      .floated-label-placeholder {
        @apply(--paper-font-caption);
      }

      .underline {
        position: relative;
      }

      .focused-line {
        height: 2px;

        -webkit-transform-origin: center center;
        transform-origin: center center;
        -webkit-transform: scale3d(0,1,1);
        transform: scale3d(0,1,1);

        background: var(--paper-input-container-focus-color, --default-primary-color);

        @apply(--paper-input-container-underline-focus);
      }

      .underline.is-highlighted .focused-line {
        -webkit-transform: none;
        transform: none;
        -webkit-transition: -webkit-transform 0.25s;
        transition: transform 0.25s;

        @apply(--paper-transition-easing);
      }

      .underline.is-invalid .focused-line {
        background: var(--paper-input-container-invalid-color, --google-red-500);

        -webkit-transform: none;
        transform: none;
        -webkit-transition: -webkit-transform 0.25s;
        transition: transform 0.25s;

        @apply(--paper-transition-easing);
      }

      .unfocused-line {
        height: 1px;
        background: var(--paper-input-container-color, --secondary-text-color);

        @apply(--paper-input-container-underline);
      }

      :host([disabled]) .unfocused-line {
        border-bottom: 1px dashed;
        border-color: var(--paper-input-container-color, --secondary-text-color);
        background: transparent;

        @apply(--paper-input-container-underline-disabled);
      }

      .label-and-input-container {
        @apply(--layout-flex);
        @apply(--layout-relative);
      }

      .input-content {
        position: relative;
        @apply(--layout-horizontal);
        @apply(--layout-end);
      }

      .input-content ::content label,
      .input-content ::content .paper-input-label {
        position: absolute;
        top: 0;
        right: 0;
        left: 0;
        font: inherit;
        color: var(--paper-input-container-color, --secondary-text-color);

        @apply(--paper-font-common-nowrap);
        @apply(--paper-font-subhead);
        @apply(--paper-input-container-label);
      }

      .input-content.label-is-floating ::content label,
      .input-content.label-is-floating ::content .paper-input-label {
        -webkit-transform: translateY(-75%) scale(0.75);
        transform: translateY(-75%) scale(0.75);
        -webkit-transition: -webkit-transform 0.25s;
        transition: transform 0.25s;

        -webkit-transform-origin: left top;
        transform-origin: left top;

        /* Since we scale to 75/100 of the size, we actually have 100/75 of the
        original space now available */
        width: 133%;

        @apply(--paper-transition-easing);
      }

      :host-context([dir="rtl"]) .input-content.label-is-floating ::content label,
      :host-context([dir="rtl"]) .input-content.label-is-floating ::content .paper-input-label {
        /* TODO(noms): Figure out why leaving the width at 133% before the animation
         * actually makes
         * it wider on the right side, not left side, as you would expect in RTL */
        width: 100%;
        -webkit-transform-origin: right top;
        transform-origin: right top;
      }

      .input-content.label-is-highlighted ::content label,
      .input-content.label-is-highlighted ::content .paper-input-label {
        color: var(--paper-input-container-focus-color, --default-primary-color);

        @apply(--paper-input-container-label-focus);
      }

      .input-content.is-invalid ::content label,
      .input-content.is-invalid ::content .paper-input-label {
        color: var(--paper-input-container-invalid-color, --google-red-500);
      }

      .input-content.label-is-hidden ::content label,
      .input-content.label-is-hidden ::content .paper-input-label {
        visibility: hidden;
      }

      .input-content ::content input,
      .input-content ::content textarea,
      .input-content ::content iron-autogrow-textarea,
      .input-content ::content .paper-input-input {
        position: relative; /* to make a stacking context */
        outline: none;
        box-shadow: none;
        padding: 0;
        width: 100%;
        background: transparent;
        border: none;
        color: var(--paper-input-container-input-color, --primary-text-color);
        -webkit-appearance: none;
        text-align: inherit;

        @apply(--paper-font-subhead);
        @apply(--paper-input-container-input);
      }

      ::content [prefix] {
        @apply(--paper-font-subhead);
        @apply(--paper-input-prefix);
      }

      ::content [suffix] {
        @apply(--paper-font-subhead);
        @apply(--paper-input-suffix);
      }

      /* Firefox sets a min-width on the input, which can cause layout issues */
      .input-content ::content input {
        min-width: 0;
      }

      .input-content ::content textarea {
        resize: none;
      }

      .add-on-content {
        position: relative;
      }

      .add-on-content.is-invalid ::content * {
        color: var(--paper-input-container-invalid-color, --google-red-500);
      }

      .add-on-content.is-highlighted ::content * {
        color: var(--paper-input-container-focus-color, --default-primary-color);
      }
    </style>

    <template is="dom-if" if="[[!noLabelFloat]]">
      <div class="floated-label-placeholder">&nbsp;</div>
    </template>

    <div class$="[[_computeInputContentClass(noLabelFloat,alwaysFloatLabel,focused,invalid,_inputHasContent)]]">
      <content select="[prefix]" id="prefix"></content>

      <div class="label-and-input-container" id="labelAndInputContainer">
        <content select=":not([add-on]):not([prefix]):not([suffix])"></content>
      </div>
      <content select="[suffix]"></content>
    </div>

    <div class$="[[_computeUnderlineClass(focused,invalid)]]">
      <div class="unfocused-line fit"></div>
      <div class="focused-line fit"></div>
    </div>

    <div class$="[[_computeAddOnContentClass(focused,invalid)]]">
      <content id="addOnContent" select="[add-on]"></content>
    </div>

  </template>
</dom-module>

<script>
  Polymer({
    is: 'paper-input-container',

    properties: {
      /**
       * Set to true to disable the floating label. The label disappears when the input value is
       * not null.
       */
      noLabelFloat: {
        type: Boolean,
        value: false
      },

      /**
       * Set to true to always float the floating label.
       */
      alwaysFloatLabel: {
        type: Boolean,
        value: false
      },

      /**
       * The attribute to listen for value changes on.
       */
      attrForValue: {
        type: String,
        value: 'bind-value'
      },

      /**
       * Set to true to auto-validate the input value when it changes.
       */
      autoValidate: {
        type: Boolean,
        value: false
      },

      /**
       * True if the input is invalid. This property is set automatically when the input value
       * changes if auto-validating, or when the `iron-input-validate` event is heard from a child.
       */
      invalid: {
        observer: '_invalidChanged',
        type: Boolean,
        value: false
      },

      /**
       * True if the input has focus.
       */
      focused: {
        readOnly: true,
        type: Boolean,
        value: false,
        notify: true
      },

      _addons: {
        type: Array
        // do not set a default value here intentionally - it will be initialized lazily when a
        // distributed child is attached, which may occur before configuration for this element
        // in polyfill.
      },

      _inputHasContent: {
        type: Boolean,
        value: false
      },

      _inputSelector: {
        type: String,
        value: 'input,textarea,.paper-input-input'
      },

      _boundOnFocus: {
        type: Function,
        value: function() {
          return this._onFocus.bind(this);
        }
      },

      _boundOnBlur: {
        type: Function,
        value: function() {
          return this._onBlur.bind(this);
        }
      },

      _boundOnInput: {
        type: Function,
        value: function() {
          return this._onInput.bind(this);
        }
      },

      _boundValueChanged: {
        type: Function,
        value: function() {
          return this._onValueChanged.bind(this);
        }
      }
    },

    listeners: {
      'addon-attached': '_onAddonAttached',
      'iron-input-validate': '_onIronInputValidate'
    },

    get _valueChangedEvent() {
      return this.attrForValue + '-changed';
    },

    get _propertyForValue() {
      return Polymer.CaseMap.dashToCamelCase(this.attrForValue);
    },

    get _inputElement() {
      return Polymer.dom(this).querySelector(this._inputSelector);
    },

    get _inputElementValue() {
      return this._inputElement[this._propertyForValue] || this._inputElement.value;
    },

    ready: function() {
      if (!this._addons) {
        this._addons = [];
      }
      this.addEventListener('focus', this._boundOnFocus, true);
      this.addEventListener('blur', this._boundOnBlur, true);
      if (this.attrForValue) {
        this._inputElement.addEventListener(this._valueChangedEvent, this._boundValueChanged);
      } else {
        this.addEventListener('input', this._onInput);
      }
    },

    attached: function() {
      // Only validate when attached if the input already has a value.
      if (this._inputElementValue != '') {
        this._handleValueAndAutoValidate(this._inputElement);
      } else {
        this._handleValue(this._inputElement);
      }

      this._numberOfPrefixNodes = 0;
      this._prefixObserver = Polymer.dom(this.$.prefix).observeNodes(
          function(mutations) {
            // Keep track whether there's at least one prefix node, since it
            // affects laying out the floating label.
            this._numberOfPrefixNodes += mutations.addedNodes.length -
                mutations.removedNodes.length;
          }.bind(this));
    },

    detached: function() {
      if (this._prefixObserver) {
        Polymer.dom(this.$.prefix).unobserveNodes(this._prefixObserver);
      }
    },

    _onAddonAttached: function(event) {
      if (!this._addons) {
        this._addons = [];
      }
      var target = event.target;
      if (this._addons.indexOf(target) === -1) {
        this._addons.push(target);
        if (this.isAttached) {
          this._handleValue(this._inputElement);
        }
      }
    },

    _onFocus: function() {
      this._setFocused(true);
    },

    _onBlur: function() {
      this._setFocused(false);
      this._handleValueAndAutoValidate(this._inputElement);
    },

    _onInput: function(event) {
      this._handleValueAndAutoValidate(event.target);
    },

    _onValueChanged: function(event) {
      this._handleValueAndAutoValidate(event.target);
    },

    _handleValue: function(inputElement) {
      var value = this._inputElementValue;

      // type="number" hack needed because this.value is empty until it's valid
      if (value || value === 0 || (inputElement.type === 'number' && !inputElement.checkValidity())) {
        this._inputHasContent = true;
      } else {
        this._inputHasContent = false;
      }

      this.updateAddons({
        inputElement: inputElement,
        value: value,
        invalid: this.invalid
      });
    },

    _handleValueAndAutoValidate: function(inputElement) {
      if (this.autoValidate) {
        var valid;
        if (inputElement.validate) {
          valid = inputElement.validate(this._inputElementValue);
        } else {
          valid = inputElement.checkValidity();
        }
        this.invalid = !valid;
      }

      // Call this last to notify the add-ons.
      this._handleValue(inputElement);
    },

    _onIronInputValidate: function(event) {
      this.invalid = this._inputElement.invalid;
    },

    _invalidChanged: function() {
      if (this._addons) {
        this.updateAddons({invalid: this.invalid});
      }
    },

    /**
     * Call this to update the state of add-ons.
     * @param {Object} state Add-on state.
     */
    updateAddons: function(state) {
      for (var addon, index = 0; addon = this._addons[index]; index++) {
        addon.update(state);
      }
    },

    _computeInputContentClass: function(noLabelFloat, alwaysFloatLabel, focused, invalid, _inputHasContent) {
      var cls = 'input-content';
      if (!noLabelFloat) {
        var label = this.querySelector('label');

        if (alwaysFloatLabel || _inputHasContent) {
          cls += ' label-is-floating';
          if (invalid) {
            cls += ' is-invalid';
          } else if (focused) {
            cls += " label-is-highlighted";
          }
          // If a prefix element exists, the label has a horizontal offset
          // which needs to be undone when displayed as a floating label.
          if (this._numberOfPrefixNodes > 0) {
            this.$.labelAndInputContainer.style.position = 'static';
          }
        } else {
          // When the label is not floating, it should overlap the input element.
          if (label) {
            this.$.labelAndInputContainer.style.position = 'relative';
          }
        }
      } else {
        if (_inputHasContent) {
          cls += ' label-is-hidden';
        }
      }
      return cls;
    },

    _computeUnderlineClass: function(focused, invalid) {
      var cls = 'underline';
      if (invalid) {
        cls += ' is-invalid';
      } else if (focused) {
        cls += ' is-highlighted'
      }
      return cls;
    },

    _computeAddOnContentClass: function(focused, invalid) {
      var cls = 'add-on-content';
      if (invalid) {
        cls += ' is-invalid';
      } else if (focused) {
        cls += ' is-highlighted'
      }
      return cls;
    }
  });
</script>