單擊 DIV 時應用動態數據綁定以使用 HTML 輸入編輯 CSS -knockout.js

Question

我正在嘗試編輯數組的各個元素。 我有一個像這樣的 JSON 數組：

[   {"idComponent":1,"left":"100px","top":"100px","idHTML":"name_div","width":"200px","height":"300px","value":"My name is"}
               ,{"idComponent":2,"left":"200px","top":"200px","idHTML":"date_div","width":"200px","height":"300px","value":"2016-Enero-12"}
               ,{"idComponent":3,"left":"300px","top":"300px","idHTML":"weigth_div","width":"200px","height":"300px","value":"1.5 KG"}
               ,{"idComponent":4,"left":"400px","top":"400px","idHTML":"talla_div","width":"200px","height":"300px","value":"23"}
               ,{"idComponent":5,"left":"500px","top":"500px","idHTML":"description_div","width":"300px","height":"300px","value":"The text"}
            ]

這些在淘汰賽中被轉換為可觀察的。 每個都綁定到一個 DIV 元素以顯示在屏幕上。 “left”、“top”、“height”和“width”是應用於每個屬性的 CSS 屬性。

當您用鼠標單擊包含的 DIV 時，我試圖將元素綁定到 HTML 輸入以編輯 CSS 值。 您可以在下一張圖片中看到這個想法：

樣機圖像 - 單擊此處查看圖像

代碼如下：

  function convertPixelsToInches(pixels){
    return pixels/96;
  }

  // Elemento regresados desde el servidor.
  var dataFromServer =
  {
     "idTemplate":"1"
    ,"components" :
      [{"idComponent":1,"left":"100px","top":"100px","idHTML":"name_div","width":"200px","height":"300px","value":"Sergio Pinto Fernandez"}
      ,{"idComponent":2,"left":"200px","top":"200px","idHTML":"date_div","width":"200px","height":"300px","value":"2016-Enero-12"}
      ,{"idComponent":3,"left":"300px","top":"300px","idHTML":"weigth_div","width":"200px","height":"300px","value":"1.5 KG"}
      ,{"idComponent":4,"left":"400px","top":"400px","idHTML":"talla_div","width":"200px","height":"300px","value":"23"}
      ,{"idComponent":5,"left":"500px","top":"500px","idHTML":"description_div","width":"300px","height":"300px","value":"Tomar dos cucharadas cada 3 hras."}
      ]
    ,"paperSize":"papersize_USLetter_portrait"
    ,"templateImage":{
      "imageUrl":"images/SolicitudLaboratorioExpress.jpg"
      ,"width":"8.5in"
      ,"height":"11in"
      ,"left":"0px"
      ,"top":"0px"
    }
  };

  function componentModel(dataComponent) {
    if (!dataComponent) {
      dataComponent = {};
    }

    var self = this;
    self.idComponent  = ko.observable(dataComponent.idComponent);
    self.left         = ko.observable(dataComponent.left);
    self.top          = ko.observable(dataComponent.top);
    self.idHTML       = ko.observable(dataComponent.idHTML);
    self.width        = ko.observable(dataComponent.width);
    self.height       = ko.observable(dataComponent.height);
    self.value        = ko.observable(dataComponent.value);
  }

  /**
   * data Json from server.
   *
   */
  function templateModel(data) {
    if (!data) {
      data = {};
    }
    var self = this;

    self.components = ExtractComponents(self, data.components, componentModel);

    self.currentSelectedComponent = ko.observable();
    self.currentSelectedComponentIndex = ko.observable(-1);

    //self.currentSelectedComponentLeft = ko.observable();
    self.currentSelectedComponentLeft = ko.computed(function(){
      var value = self.currentSelectedComponentIndex();
      console.log(typeof value);
      //value=value*1;
      console.log(value);
      if (value ) {
        return "TT";
      }

      // Get "200px y must save as 200"
      //return self.currentSelectedComponent().left;//.substring(0,data.length-2);
      return "FF";
    });
    self.currentSelectedComponentTop = ko.observable();
    self.editComponent = function(component,index){
      self.currentSelectedComponentIndex(index);
      self.currentSelectedComponent(component);

      // Binding the component to the editor.
      // ??
    };
    function bindComponentToEditor() {
      ko.applyBindings()
    }


    self.idTemplate = ko.observable(data.idTemplate);
    self.paperSize = ko.observable(data.paperSize);

    /* */
    self.paperSizeWidth = ko.observable(convertPixelsToInches(1067));
    self.paperSizeHeigth = ko.observable(convertPixelsToInches(1067));
    //
    self.templateImage_imageUrl = ko.observable(data.templateImage.imageUrl);
    self.templateImage_width = ko.observable(data.templateImage.width);
    self.templateImage_height = ko.observable(data.templateImage.height);
    self.templateImage_left = ko.observable(data.templateImage.left);
    self.templateImage_top = ko.observable(data.templateImage.top);
  }

  /**
   * parent: referencia al objeto o funcion que mando a llamar esta fucnion.
   *
   * dataArr: Array de elementos que se desea la funcion ExtractComponents haga mapeo.
   *    Ejemplo de dataArr:
   *
   *        [   {"idComponent":1,"left":"100px","top":"100px","idHTML":"name_div","width":"200px","height":"300px","value":"Sergio Pinto Fernandez"}
           ,{"idComponent":2,"left":"200px","top":"200px","idHTML":"date_div","width":"200px","height":"300px","value":"2016-Enero-12"}
           ,{"idComponent":3,"left":"300px","top":"300px","idHTML":"weigth_div","width":"200px","height":"300px","value":"1.5 KG"}
           ,{"idComponent":4,"left":"400px","top":"400px","idHTML":"talla_div","width":"200px","height":"300px","value":"23"}
           ,{"idComponent":5,"left":"500px","top":"500px","idHTML":"description_div","width":"300px","height":"300px","value":"Tomar dos cucharadas cada 3 hras."}
        ]
   *
   * modelConstructor:  funcion con que se creara un nuevo componente, es decir el modelo.
   *
   */
  function ExtractComponents(parent, dataArr, modelConstructor) {
    var components = [];
    if (dataArr == null) {
      return components;
    }

    for (var i = 0; i < dataArr.length; i++) {
      var dataArrElement = dataArr[i];
      var component = new modelConstructor(dataArrElement,parent);
      components.push(component);
    }
    return components;
  }

  ko.applyBindings(new templateModel(dataFromServer));

我有兩個問題：

1. 左側和頂部值的輸入僅接受整數值，我需要將子字符串“200px”轉換為 200 但我總是收到錯誤：“.left 未定義”

   self.currentSelectedComponentLeft = ko.computed(function(){ var value = self.currentSelectedComponentIndex(); console.log(typeof value); //value=value*1; console.log(value); if (value ) { return "TT"; }

    // Get "200px and save as 200" //return self.currentSelectedComponent().left;//.substring(0,data.length-2); return "FF"; });

2. 主要問題...當我單擊元素到右側的輸入時，如何綁定 DIV 元素？ 我想我需要動態綁定，或者動態訂閱，但是找不到動態雙數據綁定這個問題的答案。

這是 HTML：

<div id="mainContainer">
  <div id="contentPrint_div" class="page" data-bind="css: paperSize">

    <img id="template_img" data-bind="attr: {src: templateImage_imageUrl},
      style: {width: templateImage_width, height: templateImage_height, left: templateImage_left, top: templateImage_top}">

    <div id="fieldsArea_div" class="" data-bind="foreach: components">
      <div class="field" data-bind="html: value, style: {width: width, left:left, top:top},
         attr: {id: idHTML}, click: $parent.editComponent($data,$index)"></div>
    </div>
  </div>

  <div id="toolsbar">
    <div id="toolbarPanel">
      ID template:<span data-bind='text: idTemplate'></span>

      <div id="panelMenuInfoElements_div">
        Elemento actual: <span data-bind='text: idTemplate'></span>
        Posicion
        X:<input type="text" class="form-control" id="" placeholder="x" min="0" step="0.01"
            data-bind="attr: {max: paperSizeWidth}, value: currentSelectedComponentTop">
        Y:<input type="text" class="form-control" id="" placeholder="y" min="0" step="0.01"
            data-bind="attr: {max: paperSizeHeigth}, value: currentSelectedComponentLeft">
      </div>

    </div>
    <div id="toolbarCode">
      <pre data-bind="text: ko.toJSON($root, null, 2)"></pre>
    </div>

  </div>
</div>

Answer 1

你發布了相當多的代碼； 我不是 100% 確定我是否正確回答了您的所有問題。 但是我試圖創建一個我認為可以展示如何解決您的問題的示例。

• 我使用了一個computed來創建一個style對象，該對象將作為數字的x和y observables 重寫為style綁定兼容： { top: 0px, left: 0px }
• 我使用with綁定將您的<input>元素鏈接到最后點擊的塊。

 var Block = function(name, x, y) { this.label = name; this.x = ko.observable(x); this.y = ko.observable(y); this.style = ko.computed(function() { return { top: this.y() + "px", left: this.x() + "px" } }, this); } var VM = function() { this.blocks = [ new Block("Block 1", 100, 100), new Block("Block 2", 200, 100), new Block("Block 3", 300, 100), ]; this.selectedBlock = ko.observable(this.blocks[0]); }; ko.applyBindings(new VM());

 .Block { position: absolute; background: red; padding: 1rem; list-style: none; } .Block.is-selected { background: yellow; }

 <script src="https://cdnjs.cloudflare.com/ajax/libs/knockout/3.2.0/knockout-min.js"></script> <div class="Inputs" data-bind="with: selectedBlock"> <div> Editing <span data-bind="text: label"></span> </div> <div>Left: <input type="number" data-bind="value: x"> </div> <div>Top: <input type="number" data-bind="value: y"> </div> </div> <ul data-bind="foreach: blocks"> <li class="Block" data-bind=" click: $parent.selectedBlock, style: style, text: label, css: { 'is-selected': $data == $parent.selectedBlock()}"></li> </ul>