我正在尝试读取(input type=“file”）图像文件的原始宽度/高度。 我的代码给了我“未定义”。 我想是因为我没有加载图像到服务器或任何地方。
这是我的代码；
<script>
$( document ).ready(function() {
$('#texture_modal').click(function () {
var texture_name = $('#texture_name').val();
var thumb_img = $('#thumb_img').val().replace(/^.*\\/, "");
var big_img = $('#big_img').val().replace(/^.*\\/, "");
var real_img = $('#real_img').val().replace(/^.*\\/, "");
var img_size = document.getElementById("real_img").files[0].size / (1024*1024); // Get real_img size in MB
var texture_size = img_size.toFixed(2); // get rid of decimals in real_img size MB
var texture_category = $('#texture_category').val();
var texture_description = $('#texture_description').val();
// THIS IS THE STUFF WHICH I WANT TO GET IMAGE WIDTH
var texture_dim = document.getElementById("real_img").naturalWidth;
console.log(texture_dim);
}); //End click function
}); //End document ready
</script>
这是我的输入字段。 我有多个文件输入，这是为缩略图图像，大图像和真实图像。 我只需要真实的图像宽度，其他人将上传到服务器。 下面是我的输入字段；
<!-- this fields are inside a bootstrap modal -->
<div class="modal-body">
<div class="input-group input-group-sm">
<div class="input-group-prepend">
<span class="input-group-text"><small>Texture Name</small></span>
</div>
<input type="text" class="form-control" id="texture_name">
</div>
<div class="form-group pt-1">
<small>Thumbnail Img(200*200)</small>
<input type="file" class="form-control form-control-sm" id="thumb_img">
<small>Big Img(445*445)</small>
<input type="file" class="form-control form-control-sm" id="big_img">
<!-- this one i want to take width without post or upload anywhere -->
<small>Real Img</small>
<input type="file" class="form-control form-control-sm" id="real_img">
<!-- taking categories with php function -->
<small>Category</small>
<select id="texture_category" class="form-control form-control-sm">
<option selected disabled>----- Choose a Category -----</option>
<?php foreach($texture_categories as $key){?>
<option><?php echo $key; ?></option>
<?php } ?>
</select>
<small>Description :</small>
<textarea id="texture_description" class="form-control form-control-sm"></textarea>
</div>
</div>
你能试着分配一个图像并得到它吗
null
var fileUpload=document.getElementById("photoInput");
function Test(){
var reader = new FileReader();
reader.readAsDataURL(fileUpload.files[0]);
reader.onload = function (e) {
var image = new Image();
image.src = e.target.result;
image.onload = function () {
var width = this.naturalWidth || this.width;
var height = this.naturalHeight || this.height;
console.log(height,width)
}
};
}<div class="photo">
<input type="file" name="photo" id="photoInput" onchange="Test(this)"/>
</div>