onsubmit | 易学教程

Combining form onsubmit parameter with jquery submit event handler

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问题 I have a form that is being generated by legacy back-end code that, for a variety of reasons, I can't change. The form is straightforward HTML: <form action="#" id="theForm" onsubmit="return check_theForm(); method="post">  </form> On submission the onsubmit parameter fires to verify that all compulsory field have been filled in, using the check_theform() function which contains "plain vanilla" javascript (i.e. no jQuery code). In other words, basic stuff. I'm now

Can you tell me what this form is doing?

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问题 I don't understand what this form is doing. I'm very inexperienced with Ajax and only somewhat experienced with PHP. I understand that the ajax.php is run after the form is submitted but I do not understand the onsubmit portion. This form is returning an error "Error Parsing JSON" at the moment. <form action="<?=$module->path?>/ajax.php" method="post" enctype="multipart/form-data" class="tabmin_form" onsubmit="return handleAjaxForm(this, function(resp){AlertSet.addJSON(resp).show(); tabset_<?

JS AJAX: promise dependant submit always submitted

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问题 Finally, I managed to do this: function validar(dato_a_validar, url, secc) { var datastr = "secc=" + secc + "&dato=" + dato_a_validar; return new Promise(function(resolve, reject) { $.ajax({ type:'GET', url:url, data:datastr, success:function(response) { resolve(response); }, error:function(response) { reject(response); } }); }); } async function check_submit() { init(); // sets some global variables errores_personal_cnt = 0; // error counter var dni_ctl = document.getElementById("frm

javascript async await Submitting a form with onsubmit using Promise

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问题 I'm having following code. <!DOCTYPE html> <html> <head> <script type="text/javascript"> function sleep( lf_ms ) { return new Promise( resolve => setTimeout( resolve, lf_ms ) ); } async function check_form() { alert( 'Test 1' ); await sleep( 1000 ); alert( 'Test 2' ); return false; } </script> </head> <body> <form name="myform" method="post" action="test.htm" onsubmit="return check_form();"> <input type="text" name="city"><br> <br> <a href="javascript:check_form();">check the method call via

javascript onsubmit not working

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问题 I am trying to make a javascript function work on submitting the form, the function doesnt seem to run. Can anyone help? <html> <head> <script> function upload(){ alert("I am an alert box!"); } </script> </head> <body> <form enctype="multipart/form-data" method="post" onsubmit="return upload();"> <input type="file" name="file"> <input type="submit" name="upload" value="Datei hochladen"> </form> </body> </html> 回答1: When attaching the event handler to the form element, the scope of the event

React hook useState not updating with onSubmit

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问题 I'm currently experiencing an issue pushing the input field value to state onSubmit. codesandbox I'm trying to set an input field value to the state so that I can use that value once the component is updated to redirect the user to another page. I tested the path manually and it works, but since the state is not updating synchronously, the redirect does not work. I can render the input value on the page, but if I try to log it, it long undefined(for the first time) and the previous state on a

React hook useState not updating with onSubmit

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React hook useState not updating with onSubmit

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React hook useState not updating with onSubmit

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React hook useState not updating with onSubmit

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