ace-shexc-user/form.html at master · shexSpec/ace-shexc-user · GitHub

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<html>
  <head>
    <title>invoke ace-shex-user</title>
    <style>
      h1 { text-align: center; margin: 0; color: #33f; font-size: 1.4em; }
      *[name=schemaURL] { width: 33%; margin-right: .2em; }
      *[name=schema] { width: 100%; height: 20%; margin-bottom: .2ex; }
      .plus { font-size: .7em; padding: 0; cursor: copy; }
      .hover { border: .25em dashed #f0a133; }
    </style>
  </head>
  <body>
    <h1>invoke ace-shex-user</h1>
    <form method="get" action="ace-shexc">
      <p>
        <label for="schemaURL">schemaURL:</label> <span class="wrapper"><input type="text" name="schemaURL"/></span><br/>
        <label for="schema">schema:</label><span class="wrapper"><textarea name="schema"></textarea></span>
        <input type="submit" value="Submit"/>
      </p>
    </form>
    <!-- The following javascript is not necessary for basic functionality, -->
    <script type="application/javascript">
      const wrappers = document.querySelectorAll(".wrapper")
      wrappers.forEach(wrapper => enableDragAndDrop(wrapper.firstChild))
      wrappers.forEach(addPlusses)

      function addPlusses (wrapper) {
        const button = document.createElement("button")
        button.setAttribute("class", "plus")
        button.textContent = "+"
        button.onclick = (evt) => {
          evt.preventDefault()
          addChild(wrapper)
        }
        wrapper.prepend(button)
      }

      function addChild (parent) {
        const target = parent.lastElementChild
        const clone = target.cloneNode()
        clone.value = ''
        parent.appendChild(clone)
        return clone
      }

      async function enableDragAndDrop (elt) {
        const ons = ["ondragover", "ondragenter"]
        const offs = ["ondragend", "ondragleave"]
        ons.forEach(e => elt[e] = evt => elt.classList.add("hover"))
        offs.forEach(e => elt[e] = evt => elt.classList.remove("hover"))
        elt.ondrop = function (evt) {
          elt.classList.remove("hover")
          evt.preventDefault()
          let xfer = evt.dataTransfer;
          const prefTypes = [
            {type: "files"},
            {type: "text/uri-list"},
            {type: "text/shex"},
            {type: "text/plain"}
          ];
          if (prefTypes.find(l => {
            if (l.type.indexOf("/") === -1) {
              if (xfer[l.type].length > 0) {
                console.log("handling "+xfer[l.type].length+" files...");
                readfiles(xfer[l.type], elt);
                return true;
              }
            } else {
              if (xfer.getData(l.type)) {
                var val = xfer.getData(l.type);
                console.log("handling "+l.type+"...");
                if (l.type === "text/uri-list") {
                  val.split(/\r?\n/)           // split on newline
                    .filter(l => l[0] !== '#') // strip out comments
                    .forEach(async (uri, idx) => {
                      if (idx > 0)
                        elt = addChild(elt.parentElement)
                      if (elt.getAttribute("name") === "schema") {
                        console.log(uri)
                        const resp = await fetch(uri, { headers: {Accept: "text/shex,text/plain"}})
                        const text = await resp.text()
                        elt.value = text
                      } else {
                        console.log(uri)
                        elt.value = uri
                      }
                    })
                } else /* if (l.type === "text/plain") */ {
                  elt.value = val;
                }
                return true;
              }
            }
            return false;
          }) === undefined)
            alert(
              "drag and drop not recognized:\n" +
                JSON.stringify({
                  dropEffect: xfer.dropEffect,
                  effectAllowed: xfer.effectAllowed,
                  files: xfer.files.length,
                  items: [].slice.call(xfer.items).map(i => {
                    return {kind: i.kind, type: i.type}
                  })
                }, null, 2)
            )
        }
      }

      function readfiles(files, target) {
        var sucecesses = 0;

        for (var i = 0; i < files.length; i++) {
          var file = files[i], name = file.name;
          if (i > 0)
            target = addChild(target.parentElement)
          var formData = new FormData();
          formData.append("file", file);
          var reader = new FileReader();
          reader.onload = (function (target) {
            return function (event) {
              target.value = event.target.result
            }
          })(target);
          reader.readAsText(file);
          ++sucecesses;
        }
        console.log("loaded "+sucecesses+" files.");
      }
    </script>
  </body>
</html>