Currently, I am working with MVC3 Razor and trying to modify the text of a label based on the onchange event of @Html.TextboxFor.
Below is the code snippet that illustrates what I am attempting to achieve:
In View:
@Html.TextBoxFor(x => x.ItnScanCaseCode, new { @onchange = "event();" })
JavaScript Function:
function event() {
document.getElementById('lblSelectedProductName').value ="sam";
}
Despite my efforts, it appears that this implementation is not functioning as intended.
Here is a useful jQuery syntax that works perfectly:
@Html.TextBoxFor(x => x.ItnScanCaseCode, new { @id="txtid", @onchange = "onchangeevent();" })
function onchangeevent(){
$('#txtid').val('sam');
}
To achieve this task, I rely on JavaScript, although I prefer using jQuery for its ease of use. My approach involves keeping my HTML and JavaScript code separate, listening for the on change event only after all controls have been loaded into the DOM.
An example of HTML markup for a text box with a custom label element:
<input id="ItnScanCaseCode" name="ItnScanCaseCode" type="text" value="" />
<label id="lblSelectedProductName">Test Label Text</label>
Here's the jQuery script to assign an on change event listener:
$(document).ready(function () {
$('#ItnScanCaseCode').change(function () {
$('#lblSelectedProductName').text('sam');
});
});
If you wish to encapsulate the label text changing functionality in a separate function method, you can do so like this, but the previous approach works well enough for me:
$(document).ready(function () {
function yourEventMethod() {
$('#lblSelectedProductName').text('sam');
};
$('#ItnScanCaseCode').change(function () {
yourEventMethod();
});
});
I trust that this explanation is helpful.
If you're encountering an issue with the event name, consider changing it to something else. This should resolve the problem.
@Html.TextBoxFor(x => x.ItnScanCaseCode, new { @onchange = "onchangeevent();" })
function onchangeevent(){
document.getElementById('lblSelectedProductName').value ="sam";
}
Best Regards
Give this a shot!
@Html.TextBoxFor(model => model.Picture, new { type = "file",
@onchange = "displayImage(this);" })
This is where my custom JavaScript resides
<script type="text/javascript">
function displayImage(input) {
if (input.files && input.files[0]) {
var reader = new FileReader();
reader.onload = function (e) {
$('#preview_img').attr('src', e.target.result);
}
reader.readAsDataURL(input.files[0]);
}
}
</script>
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