v - Hatena::Let

v

by noromanba 2018-02-16 [2018/02/16 14:53:52]

dumb jump to bottom of page; [Ctrl +] End alternatives

@@ -12,10 +12,10 @@
 
 // TBD simulate End key press
 
-/* for mobile
+/* for mobile and legacy browsers
+javascript:window.scrollTo(0,Math.max.apply(null,[document.documentElement.scrollHeight,document.documentElement.clientHeight,document.body.scrollHeight,document.body.clientHeight]))
 javascript:window.scrollTo(0,Number.MAX_SAFE_INTEGER)
 javascript:window.scrollTo(0,Number.MAX_VALUE)
-javascript:window.scrollTo(0,Math.max.apply(null,[document.documentElement.scrollHeight,document.documentElement.clientHeight,document.body.scrollHeight,document.body.clientHeight]))
 */
 
 // avoid Magic Number e.g.
@@ -43,13 +43,77 @@
     // FIXME `Number.MAX_SAFE_INTEGER` methods do not working on Firefox 58.0.2 Desktop
     //       expected scroll to bottom, but actual scroll to top; like this
     //            window.scrollTo(0, 0)
-    //       perhaps Fx treated like a "non-finite values", `NaN` and +/-`Infinity` c.f.
+    //       perhaps Fx treated like a "finite values", `NaN` and +/-`Infinity` c.f.
     //       https://www.w3.org/TR/cssom-view/#dom-window-scroll
     //       https://www.w3.org/TR/cssom-view/#normalize-non-finite-values
     //       https://www.w3.org/TR/cssom-view/#webidl-values
     //
-    //       Firefox 58.0.2 mobile works well
-    //       `Number.MAX_SAFE_INTEGER` and `Number.MAX_VALUE` methods
+    //       scrollTo restricted from 32-bit limit?
+    //
+    //       Firefox 58.0.2 mobile works fine
+    //       `Number.MAX_SAFE_INTEGER`, `Number.MAX_VALUE` and `1e100` (!)
     //*/
 })();
 
+// DBG
+// window.scrollTo() w/ constants X-Browser
+//
+// - Chromium         64.0.3282.167     32-bit arch
+// - Firefox          58.0.2            32-bit arch
+// - Edge mobile      1.0.0.1656 Blink  64-bit arch
+// - Firefox mobile   58.0.2            64-bit arch
+//
+//
+// Browser Compatibility Table
+//
+// [x] works
+// [ ] like a finite, treated to `0`
+// [-] not check yet
+//
+// | Browser      | height | MAX_SAFE_INTEGER | MAX_VALUE | exponential | hex |
+// |--------------|--------|------------------|-----------|-------------|-----|
+// | Chromium     | [x]    | [x]              | [ ]       | [ ]         | [x] |
+// | Firefox      | [x]    | [ ]              | [ ]       | [ ]         | [x] |
+// | Edge mobi    | [x]    | [x]              | [ ]       | [ ]         | [-] |
+// | Firefox mobi | [x]    | [x]              | [x]       | [x]         | [-] |
+//
+//  exponential: 1e100
+//  hex: 0xFFFFFFF  (< signed 32-bit limit)
+//
+//
+// IEEE 754[-2008] c.f.
+// https://en.wikipedia.org/wiki/IEEE_754
+// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isSafeInteger
+//
+// Number.MAX_SAFE_INTEGER          // 9007199254740991
+// Number.MAX_SAFE_INTEGER
+// .toPrecision(16)                 // 9007199254740991
+// 2 ** 53 - 1                      // 9007199254740991
+// Number.MAX_VALUE                 // 1.7976931348623157e+308
+//
+//
+// MAX_VALUE truncates
+//
+// bitwise op 32-bit signed number c.f.
+// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Bitwise_Operators#Signed_32-bit_integers
+// Math.pow(2, 32 -1)               // 2147483648
+//
+// Number.MAX_VALUE | 0             // 0
+// ~~Number.MAX_VALUE               // 0
+// parseInt(Number.MAX_VALUE, 10)   // 1
+// Math.trunc(Number.MAX_VALUE)     // 1.7976931348623157e+308
+//
+//
+// Hex playing
+//
+// Number(0xFFFFFFFFFFFFFFFFF)      // 295147905179352830000
+// Number(0xFFFFFFFFFFFFFFFFF0)     // 4.722366482869645e+21
+//
+// Chromium works
+// window.scroll(0, '0x'.padEnd(Number.MAX_SAFE_INTEGER.toString().length, 'F'))
+//
+// Firefox works limit
+// window.scrollTo(0, 0xFFFFFFF)    // 268435455
+// 2 ** 32 - 1                      // 2147483648
+// window.scrollTo(0, 0xFFFFFFF0)   // 4294967280
+

/*
 * @title v
 * @description dumb jump to bottom of page; [Ctrl +] End alternatives
 * @include http://*
 * @include https://*
 * @license MIT License https://opensource.org/licenses/MIT
 * @javascript_url
 */

// via
// https://hail2u.net/blog/coding/window-scrollto-infinity-infinity.html

// TBD simulate End key press

/* for mobile and legacy browsers
javascript:window.scrollTo(0,Math.max.apply(null,[document.documentElement.scrollHeight,document.documentElement.clientHeight,document.body.scrollHeight,document.body.clientHeight]))
javascript:window.scrollTo(0,Number.MAX_SAFE_INTEGER)
javascript:window.scrollTo(0,Number.MAX_VALUE)
*/

// avoid Magic Number e.g.
// 99999..., 10000... and 1e100...
(() => {
    'use strict';

    //*/ boring...
    window.scrollTo(0, Math.max(...[
        document.documentElement.scrollHeight,
        document.documentElement.clientHeight,
        document.body.scrollHeight,
        document.body.clientHeight,
    ]));
    /*/
    window.scrollTo(0, Number.MAX_SAFE_INTEGER || Infinity);
    // XXX `Infinity` is fallback/workaround for IE (might be fixed) c.f.
    //     https://hail2u.net/blog/coding/window-scrollto-infinity-infinity.html
    //     https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/MAX_SAFE_INTEGER
    //
    //     You can use `Number.MAX_VALUE` BUT exponential;
    //     so hard to try decimalization before truncate c.f.
    //     https://stackoverflow.com/questions/18719775/parsing-and-converting-exponential-values-to-decimal-in-javascript
    //
    // FIXME `Number.MAX_SAFE_INTEGER` methods do not working on Firefox 58.0.2 Desktop
    //       expected scroll to bottom, but actual scroll to top; like this
    //            window.scrollTo(0, 0)
    //       perhaps Fx treated like a "finite values", `NaN` and +/-`Infinity` c.f.
    //       https://www.w3.org/TR/cssom-view/#dom-window-scroll
    //       https://www.w3.org/TR/cssom-view/#normalize-non-finite-values
    //       https://www.w3.org/TR/cssom-view/#webidl-values
    //
    //       scrollTo restricted from 32-bit limit?
    //
    //       Firefox 58.0.2 mobile works fine
    //       `Number.MAX_SAFE_INTEGER`, `Number.MAX_VALUE` and `1e100` (!)
    //*/
})();

// DBG
// window.scrollTo() w/ constants X-Browser
//
// - Chromium         64.0.3282.167     32-bit arch
// - Firefox          58.0.2            32-bit arch
// - Edge mobile      1.0.0.1656 Blink  64-bit arch
// - Firefox mobile   58.0.2            64-bit arch
//
//
// Browser Compatibility Table
//
// [x] works
// [ ] like a finite, treated to `0`
// [-] not check yet
//
// | Browser      | height | MAX_SAFE_INTEGER | MAX_VALUE | exponential | hex |
// |--------------|--------|------------------|-----------|-------------|-----|
// | Chromium     | [x]    | [x]              | [ ]       | [ ]         | [x] |
// | Firefox      | [x]    | [ ]              | [ ]       | [ ]         | [x] |
// | Edge mobi    | [x]    | [x]              | [ ]       | [ ]         | [-] |
// | Firefox mobi | [x]    | [x]              | [x]       | [x]         | [-] |
//
//  exponential: 1e100
//  hex: 0xFFFFFFF  (< signed 32-bit limit)
//
//
// IEEE 754[-2008] c.f.
// https://en.wikipedia.org/wiki/IEEE_754
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isSafeInteger
//
// Number.MAX_SAFE_INTEGER          // 9007199254740991
// Number.MAX_SAFE_INTEGER
// .toPrecision(16)                 // 9007199254740991
// 2 ** 53 - 1                      // 9007199254740991
// Number.MAX_VALUE                 // 1.7976931348623157e+308
//
//
// MAX_VALUE truncates
//
// bitwise op 32-bit signed number c.f.
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Bitwise_Operators#Signed_32-bit_integers
// Math.pow(2, 32 -1)               // 2147483648
//
// Number.MAX_VALUE | 0             // 0
// ~~Number.MAX_VALUE               // 0
// parseInt(Number.MAX_VALUE, 10)   // 1
// Math.trunc(Number.MAX_VALUE)     // 1.7976931348623157e+308
//
//
// Hex playing
//
// Number(0xFFFFFFFFFFFFFFFFF)      // 295147905179352830000
// Number(0xFFFFFFFFFFFFFFFFF0)     // 4.722366482869645e+21
//
// Chromium works
// window.scroll(0, '0x'.padEnd(Number.MAX_SAFE_INTEGER.toString().length, 'F'))
//
// Firefox works limit
// window.scrollTo(0, 0xFFFFFFF)    // 268435455
// 2 ** 32 - 1                      // 2147483648
// window.scrollTo(0, 0xFFFFFFF0)   // 4294967280

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History

2018/02/16 14:53:52 - 2018-02-16
2018/02/16 09:41:42 - 2018-02-16
2018/02/16 09:17:27 - 2018-02-16
2018/02/16 09:06:23 - 2018-02-16
2018/02/16 08:02:47 - 2018-02-16
2018/02/16 07:09:58 - 2018-02-16
2018/02/16 06:15:13 - 2018-02-16
2018/02/16 05:45:31 - 2018-02-16
2018/02/16 04:45:57 - 2018-02-16