pdfjs/web/viewer.js
function preferencesSet(name, value) {
          return this.initializedPromise.then(function () {
            if (this.defaults[name] === undefined) {
              throw new Error('preferencesSet: \'' + name + '\' is undefined.');
            } else if (value === undefined) {
              throw new Error('preferencesSet: no value is specified.');
            }
            var valueType = typeof value;
            var defaultType = typeof this.defaults[name];
            if (valueType !== defaultType) {
              if (valueType === 'number' && defaultType === 'string') {
                value = value.toString();
              } else {
                throw new Error('Preferences_set: \'' + value + '\' is a \"' + valueType + '\", expected \"' + defaultType + '\".');
              }
            } else {
              if (valueType === 'number' && (value | 0) !== value) {
                throw new Error('Preferences_set: \'' + value + '\' must be an \"integer\".');
              }
            }
            this.prefs[name] = value;
            return this._writeToStorage(this.prefs);
          }.bind(this));
        }
function preferencesSet(name, value) {
          return this.initializedPromise.then(function () {
            if (this.defaults[name] === undefined) {
              throw new Error('preferencesSet: \'' + name + '\' is undefined.');
            } else if (value === undefined) {
              throw new Error('preferencesSet: no value is specified.');
            }
            var valueType = typeof value;
            var defaultType = typeof this.defaults[name];
            if (valueType !== defaultType) {
              if (valueType === 'number' && defaultType === 'string') {
                value = value.toString();
              } else {
                throw new Error('Preferences_set: \'' + value + '\' is a \"' + valueType + '\", expected \"' + defaultType + '\".');
              }
            } else {
              if (valueType === 'number' && (value | 0) !== value) {
                throw new Error('Preferences_set: \'' + value + '\' must be an \"integer\".');
              }
            }
            this.prefs[name] = value;
            return this._writeToStorage(this.prefs);
          }.bind(this));
        }
function preferencesSet ( name , value ) { return this . initializedPromise . then ( function ( ) { if ( this . defaults [ name ] === undefined ) { throw new Error ( 'preferencesSet: \'' + name + '\' is undefined.' ) ; } else if ( value === undefined ) { throw new Error ( 'preferencesSet: no value is specified.' ) ; } var valueType = typeof value ; var defaultType = typeof this . defaults [ name ] ; if ( valueType !== defaultType ) { if ( valueType === 'number' && defaultType === 'string' ) { value = value . toString ( ) ; } else { throw new Error ( 'Preferences_set: \'' + value + '\' is a \"' + valueType + '\", expected \"' + defaultType + '\".' ) ; } } else { if ( valueType === 'number' && ( value | 0 ) !== value ) { throw new Error ( 'Preferences_set: \'' + value + '\' must be an \"integer\".' ) ; } } this . prefs [ name ] = value ; return this . _writeToStorage ( this . prefs ) ; } . bind ( this ) ) ; }
Set the value of a preference.
@param {string} name The name of the preference that should be changed.
@param {boolean|number|string} value The new value of the preference.
@return {Promise} A promise that is resolved when the value has been set,
provided that the preference exists and the types match.
Set the value of a preference .