github.com/EngineerKamesh/gofullstack@v0.0.0-20180609171605-d41341d7d4ee/volume3/section3/client/localstorage.go (about)

     1  package main
     2  
     3  import (
     4  	"github.com/gopherjs/gopherjs/js"
     5  	"honnef.co/go/js/dom"
     6  )
     7  
     8  var localStorage = js.Global.Get("localStorage")
     9  var D = dom.GetWindow().Document().(dom.HTMLDocument)
    10  
    11  func run() {
    12  	saveButton := D.GetElementByID("saveButton").(*dom.HTMLButtonElement)
    13  	saveButton.AddEventListener("click", false, func(event dom.Event) {
    14  		Save()
    15  	})
    16  
    17  	clearAllButton := D.GetElementByID("clearAllButton").(*dom.HTMLButtonElement)
    18  	clearAllButton.AddEventListener("click", false, func(event dom.Event) {
    19  		ClearAll()
    20  	})
    21  
    22  	DisplayStorageContents()
    23  }
    24  
    25  func main() {
    26  
    27  	switch readyState := D.ReadyState(); readyState {
    28  	case "loading":
    29  		D.AddEventListener("DOMContentLoaded", false, func(dom.Event) {
    30  			go run()
    31  		})
    32  	case "interactive", "complete":
    33  		run()
    34  	default:
    35  		println("Unexpected document.ReadyState value!")
    36  	}
    37  }
    38  
    39  func Save() {
    40  
    41  	itemKey := D.GetElementByID("itemKey").(*dom.HTMLInputElement)
    42  	itemValue := D.GetElementByID("itemValue").(*dom.HTMLInputElement)
    43  
    44  	if itemKey.Value == "" {
    45  		return
    46  	}
    47  
    48  	SetKeyValuePair(itemKey.Value, itemValue.Value)
    49  	itemKey.Value = ""
    50  	itemValue.Value = ""
    51  	DisplayStorageContents()
    52  }
    53  
    54  func ClearAll() {
    55  	localStorage.Call("clear")
    56  	DisplayStorageContents()
    57  }
    58  
    59  func SetKeyValuePair(itemKey string, itemValue string) {
    60  	localStorage.Call("setItem", itemKey, itemValue)
    61  }
    62  
    63  func DisplayStorageContents() {
    64  
    65  	itemList := D.GetElementByID("itemList")
    66  	itemList.SetInnerHTML("")
    67  
    68  	for i := 0; i < localStorage.Length(); i++ {
    69  
    70  		itemKey := localStorage.Call("key", i)
    71  		itemValue := localStorage.Call("getItem", itemKey)
    72  
    73  		dtElement := D.CreateElement("dt")
    74  		dtElement.SetInnerHTML(itemKey.String())
    75  
    76  		ddElement := D.CreateElement("dd")
    77  		ddElement.SetInnerHTML(itemValue.String())
    78  
    79  		itemList.AppendChild(dtElement)
    80  		itemList.AppendChild(ddElement)
    81  	}
    82  
    83  }